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Fanfiction has a tendency to be updated like an ongoing serial work, even when it's ostensibly just one story, which naturally leads to fics getting very long indeed with time.

An unofficial listing of all fanfiction.net works in excess of 800,000 words (as of 7 November 2021) can be found here.


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    Over 2,000,000 words (single) 
  • The Loud House: Revamped, a The Loud House Massive Multiplayer Crossover fanfic, has now officially taken Ambience: A Fleet Symphony's place as FanFiction.Net's longest ongoing fanfiction. It sits at over 16 million words across at least over 1,700 chapters and the numbers are still rising. It's gotten so big, in fact, that it broke Fanfiction.net's word count (since they used 24-bit integers) and thus can't get higher than 16,777,215. For the curious: it's a self-insert fanfic wherein the protagonist joins with the Loud House to combat evil forces. Most of the text, however, is in script format and consists of one-liners and copy-pasted fan wiki entries.
  • As of 9 May 2022, Future Shock - Cameron (link), a Terminator: The Sarah Connor Chronicles fanfic, clocks in at 6,034,089 words and over 1500 chapters. It is the longest fanfic hosted on Archive of Our Own.
  • As of May 9th, 2022, At the Edge of Lasg’len (link), a Tolkien's Legendarium fanfic, clocks in at 5,819,449 words spread out over 321 chapters and is the second longest fanfic hosted on Archive of Our Own. It helps that it's written by a couple of authors rather than just one.
  • Everything Changes (link), a Formula 1 Real-Person Fic, is currently the third-longest work on Archive of our Own, at 5,268,755 words over 476 chapters (as of May 9th, 2022), and it's still being updated.
  • On 17th June 2017, Ambience: A Fleet Symphony reached 4,061,145 words, replacing The Subspace Emissary's Worlds Conquest as FanFiction.Net's longest ongoing fanfiction, and as of 24th January 2020, it is sitting at an even longer 4,556,264 words long. Having been first published on 8th May 2014, it was at one point the fastest-growing fanfiction on the site, with the author consistently putting out chapters near or exceeding 10,000 words every other day between the start of 2016 and mid-2017.
  • Death, a My Hero Academia fanfiction, has 4,116,337 words across 249 chapters as of June 29, 2021. This makes it the third longest fanfiction and the second longest ongoing story on FanFiction.Net. The story grew to over 1,000,000 words within its first four months. Many of the chapters published in 2020-2021 exceeded 40,000 words each, with Chapter 233 being a whopping 152,877 words.
  • As of May 24, 2022, counting at 4,561,356 words and updated weekly Smash Life has become the longest Super Smash Bros. fanfic, surpassing Worlds Conquest. For those who are curious: It's a documentary-style semi-reality show that deals with the life of the brawlers inside the Smash Mansion.
  • The Subspace Emissary's Worlds Conquest was for many years the longest (non-troll) fanfiction on the FanFiction.Net site, and as of 12 June 2018 contains 221 chapters consisting of 4,102,328 words. And it's not even finished - the author has been updating this fic since March of 2008, and is hoping to make it 400 chapters. The most recent chapters are roughly 40,000 words each. That's enough for them to qualify as novels on their own, at least according to The Science Fiction and Fantasy Writers of America's criteria.
  • Hugs And Kisses (link) is a fanfic featuring Chris Jericho and Stephanie McMahon... which on 1 April 2014 quietly sneaked past Worlds Conquest when its 441st chapter took it to 3,593,793 words, making it the longest story on Fanfiction.net. It held that title for about two months before Worlds Conquest exited its hiatus. As of chapter 503 it sits at 3,865,990 words, though updates seem to have stopped. The earlier part Hugs and Kisses: The Beginning is also over a million words, with the two combined totalling just over 4.9 million.
  • CCW Character Championship Wrestling (link) is the longest Gen Fic on Archive of Our Own. As of its last update on 4 December 2017 it is 229 chapters and 3,817,471 words long.
  • Spirit Of Redemption has a grand total of 3,404,854 words in 162 chapters. And by the way, it's all original plot and mostly all Original Characters. There are a few other stories out there that are longer than this, but what really makes Spirit of Redemption stand out is that it was written in only 21 months whereas the other stories that break 3 million words have been ongoing for years. It's also the longest completed fanfic. The writer, Myetel, once had a job writing technical manuals for NASA. Perhaps that explains it...
  • Freakin Gensokyo is a Touhou Project fanfic, which, as of 2 June 2021, has 154 chapters consisting of 2,508,811 words. It's way more than the author expected, as he wanted to end the fanfic at either 1,000,000 words mark or 100 chapters. It is the longest Touhou Project fanfic on FanFiction.Net.
  • Songs of the Spheres is a Massive Multiplayer Crossover that was completed on April 20th, 2020 with 2,027,047 words under its belt.
  • The same creator of Soul Chess brought us Fairy Without Wings. While Soul Chess did not break 2,000,000 words (see below) this one did and is still ongoing.
  • These Black Eyes (link) in the Teen Titans section is over 2.5 million words, 272 chapters. Depending on how much of Arc III has been lost, it may have been over 3 million in its full version.
  • With This Ring is a Young Justice self-insert fanfiction which deals with a character with significant knowledge of the DC universe who gains an Orange Power Ring. As of Aug 2021, it is over 3.6 million words long, and has been updating daily for the past several years.
  • Ah! My Goddess fanfic Trial by Tenderness sits at just over 2.2 million words as of December 2014 — at Harry Potter word-per-page rates, that's around 7,000 pages, and over three times the length of Atlas Shrugged. The author doesn't seem to be planning on stopping anytime soon, either.
  • The Chase clocks in at over 2,000,000 words (contained within over 800 chapters) as of January 2016.
  • Shards To A Whole (link) an NCIS fanfic centering around McGee and Abby but extended to show Team Gibbs evolving into The Gibbs Family. On 12/23/2017 the story was marked as complete with a word count of 2,965,445, spread over 609 chapters. Not counting Shards, an Alternate Universe story currently at 140 chapters an over 650 thousand words and counting; "Shards" picks up after chapter 290 of "StaW", and is being written by Keryl Raist for those who want to follow the plot beats of her main story without dealing with a primary plotline of her later chapters in "StaW", in which Tim and Abby McGee and Jimmy and Breena Palmer enter into a long-term four-way romantic relationship.
  • Brave New World currently stands at 2,404,050 words.
  • Diaries of a Madman, which as of April 2019, is over 2.732 million words, holding the title of the longest fic on FIMFiction, with no sign of slowing down anytime soon.
  • A Certain Unknown Level 0 has reached 3,042,225 words as of 10 September 2021, and is by far the longest A Certain Magical Index fanfiction on fanfiction.net. Spread over 166 chapters, it boasts an average count of more than 18,000 words per chapter.
    • Chapters in recent arcs rarely contain fewer than 20,000 words (and more than 30,000 on occasion), which is down in part to the author writing responses to all those who leave comments (some of them very detailed).
    • The infamously lengthy Uiharu Kazari arc alone has over 1 million words.
  • The longest fanfic on Japanese fanfiction archive Hameln is Tensei Trouble (Link), and it stands as a reminder that absurdly long fanfics aren't limited to English: as of 20 September 2020 its length is 2985 chapters and 15,260,785 characters, making it far longer than any of the other fanfics on this page even after correcting for the difference in word density when translating from Japanese to English. The fic updates daily.
  • A Third Path To The Future (link) a Harry Potter and Marvel crossover that clocks in at 2,086,111 words as of March 2022. It's updated regularly, still shows no sign of slowing down, and maintains a high quality.

    Over 2,000,000 words (series) 
  • Lightning on the Wave's Alternate Universe Harry Potter epic known as the Arc of Sacrifices. It's posted as 7 separate stories (mirroring the 7-book format of the HP series), so the site doesn't record the full tale's word count. This is really too bad, since it clocks in at just over 3 million words. Surprisingly enough (for a fanfic), it's actually a complete story. The author wrote it between September '05 and Jan '07, posting an average of 6400 words per day.
  • Undocumented Features clocks in at (as of early November 2008) approximately 20 megabytes of pure ASCII text. That's 3.5 million words long. Which actually makes it longer than the Sacrifices Arc.
  • Latias' Journey, weights in at 1,237,300 words. Combining it with its sequel Brave New World, already mentioned above, results in a length of over 3.5 million words.
  • The Infinite Loops as a whole falls under this, thanks to having multiple authors writing for different franchises in the universes setting and having others still contributing snips to them as well. As of putting this here, just the Friendship is Magic branch of the loops has gone for 198 chapters and 2,042,068 words. In total, the loops ranks in at +400 chapters and +5,000,000 words. It's gotten to the point where the trope page has sub-pages for any compilation with more then 20 chapters; The MLP Loops obviously enough, The Pokémon Loops, The RWBY Loops, The Winx Club Loops...
  • A Reborn! (2004) fanfic series Flames and Family by madashes2ashes is made up of four complete stories and the fifth is still ongoing. Part IV in particular contains 2,225,275 words in 161 chapters, putting it in FF.net's top 10 longest individual stories. In total, the word count for the fics goes over 3.5 million words.
  • Tales of The Cosmic War is a story that has three parts with a total of around 200 chapters (parts as in stories) the first one has around 1,100,000 words, the third was finished with 2,411,720 words on its own. In total, the trilogy spans 4,470,278 words.
  • The 10 core stories of BlackRoseRaven's fusion of My Little Pony: Friendship Is Magic and Norse Mythology referred to as the Blooming Moon Chronicles or the 99 Worlds Saga total 4,441,432 words. That doesn't even count the various sequels or side stories (most of the author's other entries tie in to The 'Verse).
  • The Austraeoh series. While each story has 200 chapters, they are very short, usually no more than one or two thousand words. Still, as of July 2017, the entire nonalogy clocks in at above 3,300,000 words so far, and the author is planning on several more parts.
  • The second story of the Digimon series, A Sticky Situation, is called Secret of the 327th and crosses over with Star Wars: The Clone Wars. Upon completion, it turned out to be 220 chapters and 2,291,357 words. The third part sits at well over 840,000 as of August 2015. And the fourth sits at over 600,000.
  • The Pony POV Series. Altogether, the completed seasons and side-stories total 3,101,014 words.note  Imagine a binding of that.
    • The actual seasons can qualify. For a while, they hovered over 80,000 words, with Seasons 3 and 5 both breaking 100,000... then came Season 6. The Dark World/Shining Armor arc was a massive 825,116 word monster. Since then, seasons seem to hit this trend, with Season 5.5/6.5 hitting 174,056 words, Season 7 ending at 523,208 words, and Season 8 ending at 924,583 words.
    • Pinkie Pie's Fourth-Wall Variety Show, a non canon Pony POV series, had all its episode collected together on FIMFiction. The end result was another 423,287 words on top of everything else.
  • As of November 2016, all the works (including non-canon) in the Poké Wars added up to a total of 4,813,057 words.
  • Adopted Displaced series: As of January 1, 2017, the thirteen completed stories alone total 1,127,027 words. The series later passed the 2 million mark on May 19, 2017, with sixteen completed stories (1,531,578 words between them, with the four ongoing fics making up the difference). On top of that, the author's adding another 8,000 minimum every week. And there are more stories to come.
  • At 2.2 million words and counting, To Be Human is a five-part Marvel Cinematic Universe fanfiction series centering around Natasha Romanoff, and it's still ongoing as of October 2020. All five installments qualify as Doorstoppers in their own right, with the incomplete fifth story clocking in at 340k, and all others clocking in north of 350k words. The third part is nearly 520k words, and the fourth part tops that at 660k words. Even more impressively, the author has proven highly prolific- the series only started in March of 2019.
  • Two Danganronpa fanfiction series stand out:
    • The longest so far is Dangan Box, which is a crossover between the franchise and Medaka Box, totaling at 3,632,056 words and still counting.
    • Before it was rebooted, the entire Legacy of Despair note  totals over 2,019,894 words. It's more in line with the traditional killing game structure.
  • Nan the Keyblade Master's Super RWBY Universe, as of June 6 2022, consists of twenty-six stories, seven one-shots, one spin-off chibi story, a story that is a collection of anthology stories, two April Fools' Day one shots, a Halloween one-shot that is no longer canon, and a PSA story. Altogether, this brings the word count to 3,359,758 words in total, making it one of the largest crossover, multi-story universes.
  • The Flash Sentry Chronicles currently has 22 completed stories in the series, two more in progress, and more planned for the future. The series officially passed the 2 million word mark on August 19, 2021, with 2,004,599 words!
  • XCOM: The Hades Contingency, as well as its two sequels (Atlas Protocol and Advent Directive) have a total word count of 2.6M words as of April 2022. If one adds The XCOM Files to that, the word count jumps up to 3.5M words.

    Over 1,000,000 words (single) 
  • A Hollow in Equestria at last count is 1,082,491 words long, and is showing no signs of stopping. The author has indicated an intent to continue writing the story until it eclispses Diaries of a Madman in length.
  • Senran Persona: Ninjas of Hearts, which reaches 1,831,367 words, is, so far, the longest Persona and Senran Kagura crossover to date (and perhaps the longest Senran Kagura story), and is still ongoing.
  • Cat-Ra: Monokub just can't help himself from making each episode several quite sizable chapters. The story has 1,456,237 words over 130 chapters
  • Equestria Girls: Friendship Souls: After five years it counts 1,592,806 words (1,734,604 with a finished crossover) and keeps being updated regularly every 2-3 weeks.
  • Super Mario World (Max Landis) is a 436-page movie script that would be 7 hours long if it were made, with almost every Mario character having a supporting role, character arcs, and being name-dropped at least once.
  • Taylor Varga, a crossover between Worm and an obscure anime Luna Varga clocks in at 1.8 million words, and is still going strong as of January 2020.
  • Sonic's Ultimate Harem, one of the most controversial pieces of Sonic fanfiction, chimes in at 1.6 million words by its completion. It's a Massive Multiplayer Crossover between 107 different franchises with Sonic having sex with 360 women.
  • Imperfect Metamorphosis is a Touhou Project dark fic, which, as of 2 June 2021, has 1,309,436 words. It is the second longest Touhou Project fanfic on FanFiction.Net, as well as one of the most well known fanfics in the Touhou Project's western community.
  • Traveler: A Pokémon fanfic with just over 1.2 million words with 50 chapters as of February 2020.
  • Another Worm Fanfic, Mauling Snarks clocks at 1.5 million words as of January 2020.
  • Yet again, with a little extra help reached 1,262,281 words at its completion after approximately three years of work. This is all before the Time Skip in Naruto, incidentally, and the story continues in a sequel for Post Time-Skip. Third Fang has put up roughly 1,200,000 words in a period of 900, that is 1300 words per day, everyday. this time figure does not remove the time taken up buy revisions or time spent doing other tiresome things like sleeping and eating.
  • At over 1,080,000 and still ongoing as of 2015 Drifting is currently the second longest Naruto story on FanFiction.Net.
  • As of April 16th, 2022, The Road To Beach City (link) is the longest Steven Universe Human AU fanfic hosted on Archive of Our Own at a whopping 1,348,922 words and 262 chapters.
  • God Slaying Blade Works— A Fate/stay night/Campione! crossover written by Marcus Galen Sands, where Shirou and Illya survive the Normal ending of The Heaven's Feel route via Dimension hopping and God magic.
  • Prince of the Dark Kingdom: At 142 chapters and 1,181,731 words certainly qualifies. A Harry Potter fic.
  • Yu-Gi-Oh! Forever, which lives up to its name; it's a whopping 321 chapters, 937,873 words, long. It also has a sequel, Yu-Gi-Oh Eternal, which is 70 chapters, 451,622 words, long.
  • The Halo fanfiction The Life is 230 chapters long, with 1,622,859 words in total. Word of God originally stated that the story would end at over twice its then-current length back when it was 550,000 words; it ended up being nearly triple that. As of August 2016, it remains the longest story in the Halo fanfiction.net archive.
  • Yu-Gi-Oh! fanfic Skin, as of March 2014, has passed 1.8 million words.
  • Soul Chess is complete at 208 chapters and over 1,700,000 words.
  • The The New trials of Card Captor Sakura and friends, a Cardcaptor Sakura fiction that has almost 2 million words, featuring the entire returning casts of CCS as well as hundreds of original characters introduced in the story. The story features Sakura and Syaoran as they attempt to seal the dark forces as well learning more about their parents past while striving to understand the future for them and their friends.
  • Unequally Rational and Emotional certainly isn't short in the Negima section, at 1,221,218 words as of chapter 48.
  • Mushroom Wars reached the 1 million word milestone on April 6, 2022 at it's 121st chapter making it the longest standalone Super Mario Bros. fanfic on Fanfiction.net. It currently clocks in at 1,009,396 words as of April 11, 2022.
  • RockmanEXE: The College Years (link) comes in at over 1,000,000 words in 280 chapters. It's about three times longer than any other single fic in the Megaman category.
  • As of May, 2018 Eroninja clocks in at 90 chapters and slightly over 1,950,000 words. The side-story Eroninja: The Limelight adds over another 100,000. Both stories are still going strong and the author intends to write at least two sequels.
  • The Recursive Fanfiction Fallout: Equestria - Project Horizons has passed the original Fallout Equestria, has been completed with over 1.7 million words. Unlike plenty of other long fanfics, it's not due to Padding; both this story and the original have editors and are regarded as good quality works.
  • Universe Falls, as noted by the creator, is the longest Gravity Falls fanfic and the longest Steven Universe fanfic on FanFiction.Net, with 1,701,585 words (as of October 2020), and were at the beginning of Arc 9.
  • Ashes of the Past, a Pokémon: The Series fanfiction, clocks in at 1,869,563 words and still ongoing as of January 2019.
  • While the Blooming Moon Chronicles are a doorstopper as a whole, two stories from the series deserve special mention: Glory Be, with 1,039,124 words, and Hecate's Orphanage, with 1,149,615. (It should be noted that these wordcounts are taken from the version published on Fimfiction.Net. The fanfiction.net publications have a few thousand words extra.)
  • Starlight Over Detrot (as of January 2017) clocks in at 103 chapters and over 1,019,952 words, and is 28 chapters into its third (and possibly final) act.
  • Silver Glow's Journal (link) follows a pegasus college student from the My Little Pony: Friendship Is Magic universe through a year-long foreign exchange program on Earth. It wrapped up at 379 chapters (styled as short jounal entries) and 1,000,907 words.
  • The Digimon Adventure 02 fanfic Digimon Adventure 02: The Story We Never Told was completed at 70 chapters long, with 1,038,030 words.
  • As of July 2017, Forum of Thrones, an ongoing and interactive Game of Thrones fanfiction has reached the first third of its intended amount of chapters, finishing this milestone at 1,117,256 words divided over 290 parts in nine chapters. The author himself has stated that the next two-thirds of the story are fully expected to be even longer, with him intending to finish the story north of 4,000,000 words.
  • HP & the Jade Dragon (link) as of September 2017 has 98 chapters and over 1,069,000 words.
  • This Bites! is the longest One Piece fanfic out there with 1,885,579 words at 81 chapters (and a few specials) as of May 2021.
  • My Huntsman Academia has over 1,000,000 words in the main storynote  as well as 220,000 words of canon Omakes and 230,000 words worth of non-canon outtakes after less than a year and a half of work. It just finished Volume 1.
  • Hotel for the Broken as of November 2018 is an A/B/O Haikyuu!! fanfiction with over 1,2 million words, making it the longest Haikyuu fanfiction on Archive of our Own
  • The Loud House Historical AU Reeling In The Years clocks at 1,387,356 words as of September 2019 and still going.
  • Traveler is a Pokémon Alternate Universe Fic and Patchwork Fic where Ash receives a male Nidoran instead of a Pikachu. As of March 2019, it has over 40 chapters and is over a million words long.
  • As of July 19th, 2019, True Potential broke the one million words mark at chapter 94th.
  • A Cold Calculus is a Euphemia-themed Code Geass For Want of a Nail fic with 1304k+ words.
  • SAPR is a crossover between My Little Pony: Friendship Is Magic and RWBY that has passed 1.2 million words as of the first of January, 2020, and it continues to be updated. The author claims that he mentally divides up sections of the fic into different books, but no such indexing exists on the chapter titles, and on the three websites it is uploaded to it only has a singular listing.
  • ''Uchiha Heiress Remix has a little over 1.3 million words as of May 7, 2020.
  • A Thing of Vikings is a How to Train Your Dragon Alternate History fanfiction, and with 1,090,823 words as of chapter 100 published on Sept 20, 2020, the fic is officially longer than the combined length of the seven main Harry Potter books (1,084,170); while the author has broken up the story arcs into "books", they are currently aggregated as single fanfiction and thus qualify under this category.
  • Son of the Sannin was completed on March 24, 2021, with a total of 133 chapters and 1,235,733 words.
  • Naruto fanfic Better Left Unsaid has just barely crossed a million words as of February 2019.
  • Desperately Seeking Ranma is a Ranma ½ fanfic that clocks in at 1,426,632 words long with 98 chapters as of June 18, 2021.
  • An Eagle Among Lions is the longest Fire Emblem: Three Houses story on Archive of Our Own, having surpassed the million-word mark on September 13, 2021.
  • As of October 5, 2021, The Weaver Option clocks in at 1,196,307 words of story content.

    Over 1,000,000 words (series) 
  • The Calvinverse is a very long series, with over 1,000,000 words spread across its several stories... and that's only counting the official stories!
  • The Trixieverse MLP series is one million, three hundred and forty-six thousand and eight words in nine successive books, each one focussing on different character arcs and situations but continuing the larger narrative.
  • The Mass Effect fanfic trilogy Mass Vexations clocks in at just under 1.4 million words. Across the entire series, two of the installments clock in at just over 600,000 words.
  • Imperfect Metamorphosis by itself has over 1,300,000, but there's also additonal 412,694 words spread across its several spin-offs, making the TakerFoxx's entire series 1,722,130 words long (as of 2 June 2021).
  • The Total Drama Comeback Series is composed of the first saga, one of the only complete alternate-seasons at over 400,000 words, and the second fic Total Drama Battlegrounds is set to at least triple that amount with double the contestants. This is over a million words for a kids' show.
  • The Albus Potter Series, consisting of 7 "books", clocks in at over 1,120,000 words, about 50,000 words longer than the actual Harry Potter series.
  • Iron Hearts, each of the chapters in this MLP and Warhammer 40,000 crossover series is well over 100,000 words, with most topping 200,000 by a fair margin. Altogether, the series is roughly 1,400,000 words as of April 26 2016.
  • The six-season Total Shuffled Island Series is expected to approach 1.5 million words upon completion. The shortest finished season clocks in at about 190,000 words including author's notes, and a couple top 300K.
  • As of July 2016, the series Down to Agincourt is more than 1,000,000 words in length (and that's only the first four books of a projected nine)!
  • Child of the Storm alone ends up being over 800,000 words long. Add on the side-stories Chaos Reigns and Unfinished Business and the ongoing sequel Ghosts of the Past (which is planned to be the first of many), and it's about 1.85 million words long.
  • The Lone Traveler spans 4 main stories and numerous side stories. 1.1 million words and still climbing.
  • The Road to be a Pokemon Master, it has 3 complete stories, a fourth one that just started as of February 2019, and two more stories left to write. Together they sum 1.9 million words, and counting.
  • An Undertale fan fiction sireis called Dreemurr Chronicles by Ben10Extreme currently has 1,017,235 words.
    • The bulk of it comes from the current ongoning story, Our New Era. It has 692,208 as of the release of chapter 86 on August 15, 2019.
  • Just the main volume of the Overlord (2012) fanfic God Rising: The Cult of Ainz is 1,046,613 words long. Add in the expanded universe of spinoffs, sequels, and supplementary material (several of which are ongoing, and with more planned), and there's another nearly 800,000 words to read in order to get the whole story.
  • The Riddleverse, a series of The Fairly OddParents fics by FountainPenguin, is enormous. In March 2020, Origin of the Pixies crossed into 500,000 words with its 36th chapter out of an intended 66, while its companion, Frayed Knots, hit 403,000 with chapter 29 out of 77. The prompt challenge 130 Reasons Why I'm Fairy Trash is at 473,000 words with only 49 out of 130 prompts done. Adding in all the smaller fics totals up to 1,612,000 words. It's worth noting that the three big ones are also the three longest FOP fics around.
  • The Rigel Black Chronicles starts with "just" 220k words for book 1, but the succeeding books get longer and longer, with the fourth book being well over 400k and the whole series adding up to over 1.3 million words. It also tends toward extremely long chapters, averaging over 30k words per chapter in book 4.
  • The Arithmancer and its sequel are over 500k words each, plus another another 150k words for book 3, bringing the series total to nearly 1.3 million words.
  • Yugioh EQG is divided into four stories, 194 total chapters, and 1,008,564 words. The first story in the series is the smallest with 188,299 words, and the sequels just get bigger.
  • As of June 18, 2021, the Star Wars time-travel fic The Desert Storm is completed at 1,144,596 words in total with the series being split into twenty-four stories.
  • Elisif the Dragon-Queen spans three stories and consists of 1,198,084 words in total as of January 9th, 2021.
  • The 5 main stories comprising the Harry Potter AU Dangerverse add up to 1,899,218 words. That's not taking into account the numerous recursive fanfic the author has written, which bring the word count to well over 2 million words.
  • The main (completed) series of Loaded March stands at 1,261,720 words. The extras (complete stories in their own right, but the series is marked incomplete) stands at 78,394 words as of July 2021, bringing the total number of words related to Loaded March to 1,340,114. That being said, as Footloose is rewriting Loaded March as original fiction, the series is not likely to be updated.
  • Harry Potter: Everyone Lives AU is an ongoing chapter-by-chapter rewrite of the entire Harry Potter series where, well, Everybody Lives. As of December 2021, it's at 1,011,393 words, with a good ten chapters of Deathly Hallows still to come.
  • Shifting Lines, another Harry Potter example, features more than 1,220,000 words as of January 2022.
  • The ongoing With Pearl and Ruby Glowing series has several parts and intermissions that add up to 1,327,745 words as of June 2022.
  • Pokémon: Harmony and Chaos is a series divided into three main stories and three side-stories that act as "movies". Upon its completion, all of them together make up a total of 1,206,483 words.

    Over 500,000 words (single) 
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    Over 500,000 words (series) 
  • The For The Want Of A Nail series is a series of My Hero Academia fanfics, with the titular nail being Izuku never receiving One For All, thus remaining Quirkless. As of December 1st, 2021, the series clocks in at 744,837 words.
  • The Components of Construction is a Marvel Cinematic Universe AU fic that follows the adventures of a Gender Flipped version of Tony Stark by the name of Natasha Antonia "Toni" Stark. As of March 2020, the nineteen-part series consists of the main installment, The Limitations of Wax (a 222k word Doorstopper on its own), a Perspective Flip short story, and seventeen AU stories of a fanfic that is already itself an AU, totalling nearly 522k words.
  • Razor Knight's Cyber Moon, a Sailor Moon-based epic trilogy, parts one, two and three. Total length: over 600,000 words.
  • Higurashi author, Crimso, has written three stories (not counting the one-shots). From oldest to newest:
    • Green-Eyed Demon (39 chapters, 316,917 words)
    • Blood Flows Back (41 chapters, 319,817 words)
    • Within a Nightmare (40 chapters, 249,976 words).
      • Total word count: 886,710 words. She is currently now writing a story she calculates will have four parts to it with around thirty chapters. Each.
      • Oh, and those three stories were written from early 2011 all the way to mid-2012!
  • From Fake Dreams — a Fate/stay night Alternate Universe Fic written by Third Fang, author of the incredibly long Yet again, with a little extra help.
  • Rytex's My Little Pony: Friendship Is Magic series centering on Nova Shine and Twilight Sparkle.
    • The Apprentice, the Student, and the Charlatan clocks in at over 333,000. It's still expanding due to the author's rewrites, as shorter chapters get more to them to flesh them out more. Its original complete version finished at 242,811. Even as far as single chapters goes, Chapter 17 ("Nightfall") is over 25,000 words long, and the rewrite of Chapter 12 got to 28,000 before it was split into two parts.
    • Its sequel, Even In Other Worlds, is sitting at just over 200,000 words, however just under 40,000 words of it are April Fools' Day chapter updates (including one update that is all 22k+ words of My Immortal).
  • The Darkness Series — when both stories are taken together it puts it at over 500,000 words.
  • Kryalla Orchid's E'ara Series. The main trilogy is nearly 580,000 words, plus about 60,000 in connected one shots.
  • The Steven Universe Opal AU Series Fic Opal, Sapphire, Ruby, and STEVEN! was discontinued on March 11th, 2021 with a total of 665,083 words spread out through three installments.
  • Romance and the Fate of Equestria is a long fic, reaching 494,049 words and 195 chapters by May 2019. It also has a prequel, Legend of the Goddesses, which sits at 140,285 words and 58 chapters at the same time, totaling over 600,000 words. The first is still ongoing.
  • The Bane of Humanity's Avatar/Legend of Korra/Transfomers crossover is a measurable series to read in pieces, ranging between 80,000 and 155 thousand words. However, put all 5 stories together, and you have a solid series just measuring over 500,000 words.
  • Together, the three installments of Meg's Family Series surpass half a million words.
  • Triptych Continuum: The first story, Triptych is over 513,789 words, and there are more than 65 entries in the series.
  • Claymade's Ranma ½-Sailor Moon crossover, the The Dark Lords of Nerima series, has close to 700,000 words as of February 19th, 2019. The Dark Lords Ascendant, the third entry, is a door stopper on its own with 387,000 words.
  • Skyhold Academy Yearbook is a massive AU project for Dragon Age: Inquisition which, as of June 2021, was nearing 800,000 words and has at least two more installments planned.
  • Heart of the Storm is a five-part Marvel Cinematic Universe AU fanfiction centering around a romance between Steve Rogers and Natasha Romanov. The five parts steadily climb in length from 97k all the way up to 290k words, for a grand total of 863k words. The author proved rather prolific with this story, as well- from start to finish, it ran from July 2014 to September of the following year.
  • As of this writing, the A Man of Iron series consists of three books (with more planned) and is nearly 540,000 words long.
  • As of March 13th, 2022, the Oh Rhonda! trilogy has amassed a total of 814,074 words.
  • The Code Geass and Transformers crossover Code Prime. The first volume, R1: Rebellion, clocks in at 572,197 words, while the ongoing second volume, R2: Revolution, currently stands at 257,619.
  • The Accidental Animagus is by itself 697,191 words. It's sequel, Animagus at War, is still being updated and currently sits at 202,482 words as of December 2021. Add in the extra oneshots (which combined are at 26,933 words) and you have a series of 926,606 words!

    Over 250,000 words 

    Under 250,000 words 
  • The Elements of Friendship, Book I: Harmony is an AU of the premiere of My Little Pony: Friendship Is Magic that expands the struggle against NightMare Moon to a full epic, coming in just shy of 250,000 words. The kicker? It's the first of a planned series, meaning we might be seeing some full blown Archive Panic. So far, the only completed sequel has been the first interlude, Bonds, which is only 45,000 words long... enough to qualify for a novel in its own right.
  • Powers of Invisibility is the second longest completed Miraculous Ladybug story on Archive of Our Own at 246,310 words and it's currently in fourth place overall. A sequel and some one-shot followups have been announced.
  • Kyoshi Rising, a prequel to Avatar: The Last Airbender focused on the titular former Avatar, is currently at 242,790 words, with an author's estimation of being only a little more than a third of the way done.
  • Ultimate DCU Headverse: Alternate universe The DCU fanfiction. As of January, 2020, it totals 230,492 words spread over 98 chapters.
  • The Second Try totals 211,058 words, not counting the sequels.
  • Project Sunflower is another My Little Pony: Friendship Is Magic fic that reached 242,202 words. Its sequel has broken 100,000 words as of April 2016 and is still ongoing.
  • The Danganronpa fanfic Despair's Last Resort is, as of March 2019, 61 parts long and 222,807 words long including bonus chapters. What makes this impressive is how the author has been writing this since May 24, 2014 and has managed to upload around one or two chapters per week since then until the completion of the main story in January 2015. And each chapter has around 3,000 words at least. The author has said that she intends to go back and edit chapters as well, meaning even though it's finished, more could easily be added to it. And that doesn't even include the other fics in the series.
  • Yin Yang Yo! fanfic Re: Yin Yang Who? is currently eighteen chapters long with over 220,000 words in over five hundred pages and counting; even so, it hasn't been completed... yet.
  • As of June 2022, Pokémon Crossing: Fly Me to the Moon is over 220,000 words and is currently ongoing.
  • Long Road to Friendship ended at 42 chapters and 219,811 words. Its sequel, Spectacular Seven, has already passed that word count and is still ongoing.
  • House of Summers: This X-Men fanfiction contains 65 chapters consisting of 219,376 words.
  • Under the Northern Lights, as of April 2016, is almost finished at 214,532 words.
  • Pokémon Master is a door-stopper of a High Fantasy and a Dark Fic to boot. It clocks at 211,120 words on FF.net, but the fanfic itself is longer since the final chapter was published elsewhere.
  • FIRE! (DarkMark), a Marvel Universe story, sits at 207,563 words spread out over 28 chapters.
  • Yu-Gi-Oh! Arc V: Pendulum's Fifth Swing: As of January 18, 2021, it sits at 207,208 words spread out over 16 chapters.
  • Chrysalis Visits The Hague passed the 200,000 word threshold in September of 2017 (covering an in-story time span of seven days). And it's still ongoing.
  • The longest Total Drama story in Spanish is Total Drama World Tour Express, a sequel to the third season of the series, with nearly 200,000 words. Its sequel, Total Drama: Back to School! already has nearly 100,000 words and it's only in its midpoint.
  • Asylum, as of May 2016, has 191,704 words, and still isn't finished.
  • The Digimon fan fic Silent Sorrow is over 600 pages in length, or just over 180,000 words. What's truly amazing is that it has absolutely NO Filler or Padding whatsoever.
  • The Land Before Time fic Twilight Valley is a small doorstopper at 177,877 words.
  • Rhyme and Reason, a much Darker and Edgier and more dramatic take on the premise of Chip 'n Dale: Rescue Rangers, has nine parts with multiple chapters each and 158,492 words, most of it covering less than a day. This may not sound like much, but this story was published as early as 1996. Writing took from 1993 to 1995, making it also the first CDRR fanfic that was intended as such, followed by several rounds of proof-reading before even the first part was published, so unlike today's Door Stoppers, it wasn't written and published chapter by chapter. Besides, it's formatted for the Usenet which means a maximum of 70 characters per line and therefore a whole lot of pages. Its staggering length and quality intimidated the Rangerphiles so much that it wasn't before 1997 that someone else dared to write a CDRR fanfic. Rhyme and Reason remained the longest CDRR fanfic for almost a decade until Gadget in Chains overtook it.
  • Oversaturated World: Group Precipitation is 154,476 words long, as of its 333rd chapter.
  • The Dreamland Story. It's 87 (gradually-increasing-in-length) chapters, and 140,168 words, long, made even crazier by the fact that it's a Kirby fanfic. (And it works!)
  • The rewrite of Kirby of the Stars: The After Story has 138,137 words as of October 2nd, 2018 - and that's just the first ten chapters of the first of many story arcs that the author has planned. Its previous "beta" version ran for 57 chapters and 230,080 words.
  • The Batman fanfic Dance with the Demons sits at 134,065 words spread over 23 chapters.
  • The Team Fortress 2 fanfic Retired Mercenaries' Home Owner's Association (link) clocks in at 124,219 words spread out over 25 chapters.
  • Monster Chronicles Voodoo's Disciple is over 120,000 words long.
  • Total Drama Island, by Gilbert and Sullivan is a borderline case. Although it's "only" about 120,000 words including the supplemental materials, the PDF version clocks in at right around 500 pages because so much of its content is poetry (song lyrics) which is notorious for using page space inefficiently. The 700 Total Drama Island screenshots put a goodly percentage of that white space to use, though.
  • A Prize for Three Empires is twenty-nine chapters long with 118,387 words, which is surprising for a fanfiction starring Carol Danvers.
  • A Glass Of Wine: The original story clocks at 115,236 words spread over 22 chapters. The second version was completed at 198,045 words over 38 chapters.
  • The Regular Show fanfic Regular Show: August sits at 108,281 words spread out over twenty-two chapters.
  • Fractured, a Mass Effect/Star Wars/Borderlands crossover is "only" 100,000 words—but the sequel goes nuts being over four times longer and not even finished yet!
  • As of June 28th, 2022, Eyes on Me adds up to a total of 239,125 words spread out over fourteen entries.
  • Becoming a True Invader in total is just short of 225,000 words.
  • The Red Dwarf fanfic Fifty Shades Of Smeg The original fic comes in at a decent 120,158 words making it the third-largest Red Dwarf-related fanfic on A03. It's also the first in a series which has a total word count of 184,824 words.
  • Steven Universe Alternate Future was completed on November 1st, 2021, at 188,791 words spread out over 32 chapters.
  • The original version of The Super Starr Chronicles is nearly 175,000 words long and reached over 110 chapters before the author forgot about the story, rediscovered it, and decided to remake it.
    • As of March 2022, the remade version has twelve chapters, and it is already over 65,000 words.
  • As of April 19th, 2022, Tommy Pickles: The Terrible Twos clocks in at 110,497 words spread out over 86 chapters.
  • Cor Autem Aurora, a Kingdom Hearts/Final Fantasy XV Fix Fic, is at over 140,000 words as of December 2021.
  • As of April 13th, 2022, there is a Resident Evil Village fanfic known as She Who Waits In The Dark that sits at 235,517 words spread out over nineteen chapters. The series isn't done yet and likely won't be for several chapters.

    Unsorted 
  • The released chapters of Misfiled Dreams run 729 pages, including 2 blank pages in the first chapter and 7 pages of art. The unreleased (and unedited) chapters run another 324 pages.
  • The Unity Saga, a Star Wars/Star Trek crossover that runs a total of 250 chapters. Most of the chapters have a manageable size, but the final entries in each of the six parts suddenly balloon to a very intimidating length.
  • Rhyme and Reason was not only the first fanfic based on Chip 'n Dale: Rescue Rangers and has always been considered one of the best, but with 158,492 words, it also used to be the longest and definitely considered a Doorstopper. But then, after seven years of on-and-off work, Gadget in Chains was completed. It stands at 402,670 words.
    • The Russian original of Offensive Care has 176,362 words. The author's own English translation grew slightly beyond 200,000 words.
  • Teaching Darkness: Memories by Rae Logan, is over 206,000 words, and itself is PART 5 in a series, with the previous story at only a little over 52,000 (at least a quarter of its sequel's size!) and the currently in progress part 6 at over 137,000 as of January 27th, 2012. The fanfic series itself has sidestories (for ideas decidedly too short compared to the main stories to focus a multichapter story around, regarded as a different canon, except maybe the Twilight Zone-esque one), about seven posted scrapped unfinished stories (released as Deleted Scenes), and several fan written stories, which, if compiled into one volume would be considered a Doorstopper. Sometimes jokingly referred to THE Largest Fanfic Series Centered Around A Scrapped Character In A Game That Never Happened. Who? Mephiles the Dark from Sonic Next Gen... VERY loosely.
  • Thawing Permafrost is by no means a titan like the rest on this list, but it still qualifies as a door-stopper and the longest Mizore-centric fic in the Rosario + Vampire category (35 chapters across 518 pages, according to the author.)
    • Here In My Arms is at least two and a half times as long, in the same fandom.
  • Blood That Flows is, without a question, the longest Lyrical Nanoha fanfic on Fanfiction.net. Over 300 chapters alone and over 720,000 words. The only Nanoha fanfic that comes close is the Deva Series, where, if you add up all four parts, there are more words than Blood That Flows, but it still has less chapters. Of course, the latter is a pure Nanoha Alternate Universe Fic, while the former is a crossover with Slayers that pulls plotlines from both series.
  • The Neo Domino Purge is putting up a challenge for the longer Yu-Gi-Oh! fanfics - currently at 364,981 from 36 chapters. And still setting up the Dark Signer arc. The Remake is 94,882 words from 6 chapters. Altogether; 459,863 and counting.
    • From the same author, Override, a Cardfight!! Vanguard fanfic weighing at just under 160,000 words from just 11 chapters, giving it a greater average words per chapter than the first version of Neo-Domino Purge. And it's just getting started. Judging by the author's writing, it won't be long before it climbs into the same kind of league as the above.
  • A kitten fic trilogy, focusing on the Akatsuki from Naruto, clocks in at over 700,000 words, starting with Consider Yourselves Kitties. This is notable because kitten fics have a tendency to peter out after the first few chapters, even more so than most fics.
  • While the first Volume of TSA The Amazing Spiderman is only 50,000 words long, Volume 2 is over 800,000 words long and 70 chapters in and not yet finished. The story will continue with Volumes 3 and 4, so it will likely reach two million words. This is justifable as it is a complete retelling of Spider-Man, which is 50 years of storylines to draw from.
    • Also worth noting is that the author typically updates once a week, with most chapters going over 10,000 words.
  • Horseshoes and Hand Grenades and stories relating to it have a combined total of 327,195 words with most of them not even finished and most likely more stories on the horizon.
  • The Homestuck fanfic Like One Sundered Star is 700,000 words long as of Chapter 17, not counting its 90,000+ word "intermission fic". Word of God says that the main story is not even at its halfway point and that there will be at least one more intermission.
  • Family by The Middle Warner Sibling, an Animaniacs fanfiction following the lives of the Warner Siblings within an Animated Actor universe, has a completed total of 763,370 words. However, if taking into account the side-story Friends, which contains some particularly imperative plot points in the context of Family, the two add up a total of 966,373 words for the universe as a whole.
  • The Mobius Chronicles is currently two-and-a-half books and over 1,000 pages long, and the author reckons he has "multiple books" left to go.
  • The entire Gensokyo 20XX series is about 343,453 words long, with one story in particular being about 120 chapters.
  • As of April 28, 2020, Pokémon Reset Bloodlines stands at 689,716 words, and it's only reaching the conclusion of the Kanto arc (with the Indigo League). And that's just the main story; the numerous spinoffs and tie-in oneshots set in the same continuity add up even more for a total of 1,649,074 words (according to the Archive of Our Own stats), and over 6002 pages according to the Royal Road stats.
  • Citadel of the Heart as of writing in December 21st, 2019 adds up to 506,685 words as an entire Series Fic, but only Truth and Ideals among the individual fics is completed as of writing. Truth and Ideals proper consists of 80 Chapters, a shorter prologue and epilogue page, and consists of 254,053 words; the other installments so far have currently less than 100K words, with the second highest being Sword Art Online: Special Edition at 77,912 words. Current statistics for word counts among other things can be checked here, but be warned as some of the stories are NSFW. The word count appears differently on Fanfiction.net, because formatting purposes do not prevent author's notes from being excluded from the word counts. AO3 has a feature that allows you to place author's note at the start and or end of any chapter by toggling the option to do so, and they'll be able to be automatically excluded from the word count for the story as a whole because of this.
  • The Whisper of the Heart trilogy by Saddletank can almost fill a large sized binder when printed out using the default formatting.

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