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An unofficial listing of all fanfiction.net works in excess of 800,000 words (as of 19 January 2020) can be found here.


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    Over 2,000,000 words (single) 
  • A The Loud House Massive Multiplayer Crossover fanfic, The Loud House: Revamped, is now officially taking Ambience: A Fleet Symphony's place as FanFiction.Net's longest ongoing fanfiction. It sits at a staggering 7,469,466 words and a mind-blowing 1,262 chapters (as of December 3rd, 2020). For the curious: it's a self-insert fanfiction wherein the protagonist joins with the Loud House to combat evil forces. Most of the text, however, is in script format and one-liners.
  • At the Edge of Lasg'len, a Tolkien's Legendarium fanfiction, clocks in at almost 4,900,000 words, and is the longest fanfiction hosted on Archive of Our Own. It helps that it's written by a couple of authors rather than just one.
  • Everything Changes, a Formula 1 Real-Person Fic, is currently the second-longest work on Archive of our Own, at over 4.6 million words (as of November 23rd, 2020), 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.
  • 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 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 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.
  • The Mass Effect fanfic, 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...
  • Smash Life is chasing onto The Subspace Emissary's Worlds Conquest as the second-longest piece of Super Smash Bros. fanfiction online. As of October 5th, 2020, it currently sits with 3,259,471 words and counting, with weekly updates going on to this day (except during a 13-week hiatus from June 5 to September 6). 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.
  • These Black Eyes 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 Jan 2020, it is over 3.1 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 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 2,701,790 words as of 14 September 2019, and is by far the longest A Certain Magical Index fanfiction on fanfiction.net. Spread over 153 chapters, it boasts an average count of more than 17,500 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'', and 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 converting Japanese to English. The fic updates daily.
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    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 Katekyō Hitman Reborn! 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 nonology 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 2,176,431 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 the uncompleted Season 8 currently just north of 400,000 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.
  • 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.
  • 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 322k, 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.

    Over 1,000,000 words (single) 
  • 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
  • Max Landis' Super Mario World 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.
  • A Third Path to the Future a Harry Potter and Marvel crossover that clocks in at 1,839,596 words as of April 2020. It's updated regularly, still shows no sign of slowing down, and maintains a high quality.
  • 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.
  • 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.
  • God Slaying Blade Works— A crossover piece between 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.
  • RockmanEXE: The College Years 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 anime 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 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 as of September 2017 has 98 chapters and over 1,069,000 words.
  • This Bites! is the longest One Piece fanfic out there with 1,529,531 words at 65 chapters (and a few specials) as of May 2019.
  • 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 broke the 1 million mark with its 112th chapter on September 30th, 2020.

    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.
  • 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 spin-off Chaos Reigns and the ongoing sequel Ghosts of the Past (which is planned to be the first of many), and it's about 1.7 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.
  • Naruto fanfic Better Left Unsaid has just barely crossed a million words as of February 2019.
  • Songs Of The Spheres. A Massive Multiplayer Crossover at 1,093,000+ words and counting with weekly updates as of February 22, 2019. It is set to be significantly longer than it is currently.
  • 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.
  • Nan the Keyblade MasterSuper RWBY Universe'' has as of September 27 2020 written 13 stories, 3 one shots and 1 spin off chibi story. Which totals the word count at 1,280,910 words in total, making it one of the largest crossover, multi story universes.

    Over 500,000 words (single) 

    Over 500,000 words (series) 
  • 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 in just over one year. And I don't mean one year each.
  • 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.
  • 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 July 2019, was nearing 700,000 words and has at least three 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.
  • Harry Potter Everyone Lives AU is an ongoing chapter-by-chapter rewrite of the entire Harry Potter series where, well, Everybody Lives. As of May 2020, it's at over 730,000 words, with almost a book and a half still to go.
  • 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 November 8th, 2020, The Desert Storm series is made up of twenty stories and is over 930,000 words long in total. And it's still ongoing.
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    Over 250,000 words 
  • Phoenix Wright - Turnabout Storm!, the adaptation of the Youtube Video Series of the same name, has a total of 416,396 words.
  • While we're at it, one particularly high quality fanfic in the SWAT Kats section is Endgame, which is now completed at 473,822 words and 70 chapters! (for those who beancount, that's 6768.8 words per chapter nearly) as of November 13, 2010. And the author has no intention of quitting now. Good thing it's an action fic rather than furporn. Now, the sequel, MegaKat Shield is underway!
  • Overlordly broken, the longest Overlord fanfiction yet, has finished at 379,993 words and only 24 chapters, and is currently undergoing a rewrite which already has 115,304 words at 9 chapters.
  • Thunderblade's Battle of the Sacred Essences is "only" 252,754 words, but it still comes out in excess of 400 pages when printed.
  • A Dragon's Journey is a My Little Pony: Friendship is Magic fic of 385,025 words.
  • Event Horizon: Storm of Magic currently consists of two "Books" that collectively number over 260,000 words: the Prologue and Book One. Books Two and Three are in the works.
  • Mind, Body, and Soul, a Kim Possible fanfiction that's NSFW, clocks in at 450,669 words, and has a sequel being written that's three chapters long and 70k+ words already.
  • Dissidia Final Fantasy fanfiction Shards Of Memory ended at 41 chapters and over 275,000 words. The epilogue itself almost hits 17,000 words, twice the length of even the longest chapters up until then.
  • The appropriately named Dissidia fanfic "An Unending Struggle" is up to 360,000 words over 63 chapters, and is still going.
  • The RWBY fanfic Weiss Reacts Volume One ended at 314,860 words and is currently on its second volume.
  • The Dragon Age fanfic Middle Of Nowhere is well over 400,000 words and is still being regularly updated. At the pace it's going it should finish around 500,000 words.
  • Evangelion fanfic Advice and Trust has reached 363,558 words and 55 chapters as of July 2019.
  • Superstarultra's You Got HaruhiRolled!. Over 300,000 words long and still not done. Even more amazing, it's currently 86 chapters long, but individual chapters were still pretty short until chapter 72. A very large percentage of its length is in the last few chapters.
  • Constant Temptation, a Death Note fanfic has 102 chapters and is over 300,000 words. That's not counting the Sequel and the Deleted Scenes...
  • Hitchups is 40 chapters long, with 307,928 words that make up the entirety of the fic. For some time it was the second-longest How to Train Your Dragon story on ff.net after The Truth is a Shard of Ice by Whitefang333, though it's since been surpassed by other stories.
  • Homestuck fic Herding Cats is over 460,000 words spanning 31 chapters.
  • A Fanfiction based on Frozen (2013) called Elsa's Year, as of December 2014, is already over 300,000 words long - and still ongoing (though on hiatus).
  • The Frozen (2013) fanfic, Frozen Wight is 82 chapters and over 310,000 words long. And it has sequel fics, albeit ones much shorter in length than the original fic.
  • A Delicate Balance is a deliberately paced TwiJack fic that takes its time. At 36 chapters and 289,001 words long, it's been completed.
  • Mega Man X: Terrornova is almost 500,000 words long (496,862 to be precise).
  • What many consider one of the best Super Mario Bros./Sonic the Hedgehog crossover fanfics, Mario and Sonic: Heroes Unite!, is now complete after several years in the making. Its final stats are 371,110 words and exactly 100 chapters spawning three sagas. Sure, not quite as extensive as some other examples, but still impressive.
  • DC Universe fanfiction Kara of Rokyn sits at 274,020 words spread over 51 chapters.
  • Russian fanfic Black Book of Reverse Falls is up to 267,000 words over 64 chapters, and is still going.
  • Necessary To Win, a Girls und Panzer and Saki crossover, is over 290,000 words long and is not yet complete, making it longer than any work in either fandom on Fanfiction.net.
  • Background Pony, by the author of The End of Ponies, clocks in at 20 chapters at over 430,000 words.
  • Anthem of Our Dying Day has a whopping 442,220 word word count, with chapters regularly clocking at 10,000+ words. It has, however, went on a permanent hiatus because the author found it too hard to find his way around the convoluted plot.
  • The Tainted Grimoire is already over 60 chapters and is at nearly 370,000 words. However, it has not been updated since May 2012.
  • The Legend of Zelda: The Circle of Destiny is 435,469 words over 111 chapters as of writing, and it is still going strong.
  • Vacation From The Norm, a Kim Possible fanfic, currently sits at over 450,000 words spread over two books. There's at least one more book planned in the series and the second book isn't finished yet.
  • My Family and Other Equestrians: 281,007 words, 73 chapters and 14 interlude chapters (as of March 20, 2015), with no ending in sight (the author already has an ending planned, though).
  • All-American Girl's "Book One" is over 430,000 words long. There's also the accompanying collection of side stories, Be Human, which has almost 300,000 words. (This is as of November 2017.)
  • A Second Chance is a Peggy Sue fic where Twilight is catapulted back to the first episode. It got to 305,612 words before the author decided to end it.
  • The Immortal Game, a My Little Pony: Friendship Is Magic fic, lasts a respectable 297,951 words.
  • Green is an exceptionally long fic focusing on a romance between Rarity and Fluttershy, among other pairings. It's still unfinished at 359,441 words as of April 2016.
  • As of December 2015, Rites of Ascension is over 300K words long- and Word of God is that it is not even halfway through the second of five projected books.
  • The Legend of Total Drama Island, a reimagining of Total Drama's first season, is on course to be around 400,000 words upon completion. The author has a richly descriptive style, and a high word count is the price of that.
  • Re:Harmony is an Alternate Universe Fic of My Little Pony: Friendship Is Magic that, as of April 2016, has run over 400,000 words without finishing.
  • The shortest completed Poké Wars arc by Cornova is The Incipience at 48,468 words long. Cornova's canon works alone add up to 365,080 words. And they are still ongoing as of November 2016.
  • The longest Miraculous Ladybug fics on Archive of Our Own are:
  • Invader Zim: The Series clocks in at 429,062 words.
  • The Family Guy fanfic The Spellbook is over 284,000 words long, and is the second longest Family Guy fanfic.
  • Damaged Defenders as of September 2017 is over 327,000 words and 129 chapters.
  • The Quiververse, with eighteen completed stories, totals 448,554 words. And it's due to grow, with eight more stories in the first season alone and a second season of as-yet unannounced size to come in the future, as well as assorted bonus material.
  • Hermione's Furry Little Problem has over 412,000 words and 189 chapters.
  • Sophomore Sorrows is a high school-themed Arthur fanfic that clocks in at over 350k words.
  • Lotus Jewel, the main book of the Zelda fanfic series Their Bond is 90 chapters and has almost 300k words.
  • My Sister Leni ended at almost 275k words. It's 52 chapters long.
  • Exoria: At 385,621 words at its 30th chapter, it goes beyond the 100,000 words necessary for the trope.
  • The Frozen fic An Arm and a Leg is over 430k words long and spans over 90 chapters.
  • Queen of All Oni ends up being 302,460 words long, spread over 29 chapters.
  • Dark Mark's Supergirl story Hellsister Trilogy is 398,197 words spread over 61 chapters as of October, 2018.
  • Project Powerpuff: Declassified is 453,263 words long, spread throughout 137 chapters.
  • The New Adventures of Invader Zim is a multi-volume Series Fic, of which Season 1 clocks out at nearly 233,000 words, while the currently ongoing Season 2 is already over 111,000 words, bringing the series to over 344,000.
  • Essence is a Pokémon fanfic where Ash has a Growlithe starter. It has 393k+ words spread over 12 chapters as of April 2016.
  • SPECTRUM, by the time Act Two is finished, clocks in at around 490k words. Chapter Thirteen alone is 46,000 words long.
  • Persona: The Sougawa Files is a finished Elsewhere Fic of a Persona game, and clocks in at 330,936 words.
  • The Team Fortress 2 fanfic Sinner's Fire is currently 358,159 words long.
  • As of chapter 30, the Persona 5 For Want of a Nail Fanfic Wings Of Rebellion is at 302,212 words long.
  • Unbreakable Red Silken Thread: As of April 6th 2020, the story is on its twenty-eighth chapter and 363,109 words long. According to the author, the story may in fact become the longest Total Drama fanfiction on Fanfiction.net.
  • Yesterday Upon The Stair, a My Hero Academia fanfic, clocks in at 424,070 words.
  • Fallout Girls, a crossover between My Little Pony: Equestria Girls and Fallout 3, ongoing at just over 300,000 words.
  • Remnant Inferis: DOOM sits at 29 chapters and almost 290,000 words and is still ongoing.
  • As of this writing, Don't Lose Your Heart is roughly 490,000 words across 162 chapters and shows no sign of slowing down.
  • Hearts Of Ice is 279,662 words spread over 26 chapters.

    Under 250,000 words 

    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.

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