Is Fanfiction Legal? The Short Answer and the Gray Areas

Fanfiction is neither clearly legal nor clearly illegal. Most fanfiction is a derivative work built on characters someone else owns, but free, noncommercial fanfiction has a serious fair use argument, and no U.S. court has found a noncommercial, transformative fanwork infringing^[5]. The risk rises sharply when fanfiction is sold or copies large amounts of the original text.

Fanfiction has never been more visible. Archive of Our Own (AO3) passed 18 million fanworks in July 2026^[1], a Harry Potter fic reworked into an original novel debuted at No. 1 on the New York Times bestseller list^[2], and fan writers now share the internet with AI systems trained on their stories. The law around fanfiction has kept moving too. The Supreme Court narrowed what counts as a "transformative" use, courts issued the first major rulings on AI training, the EU's highest court defined "pastiche" for the first time, and new characters enter the U.S. public domain every January.

This guide, updated in October 2026, explains where fanfiction stands legally in the United States and abroad, which cases actually drew the lines, how platforms and rights holders enforce them, and what it all means if you write or read fan works. Fan writing is centuries older than modern copyright law (our history of fanfiction traces it back to Dante), but the legal questions have never been more practical.

The Short Answer

• Most fanfiction is a derivative work. It builds on characters and worlds someone else owns, and U.S. law gives copyright owners the exclusive right to prepare derivative works^[3][4].
• Noncommercial fanfiction has a serious fair use argument. As Betsy Rosenblatt, then legal chair of the Organization for Transformative Works, pointed out in 2019, no U.S. court has found a noncommercial, transformative fanwork to be infringing^[5].
• Money is where fan creators lose. The cases that went badly for fan-made works, from an unauthorized Catcher in the Rye sequel to a self-published Lord of the Rings sequel, involved commercial works or professional-scale fundraising^[6][7][8].
• The public domain keeps growing. Sherlock Holmes, the earliest Mickey Mouse, the first Nancy Drew books, and Miss Marple's first novel are now free to use in their original forms^[9][10][11].
• In practice, platforms and rights holders decide most outcomes. Site rules are often stricter than the law, and most disputes end with a takedown notice rather than a lawsuit.

Why Fanfiction Is a Legal Puzzle

U.S. copyright law defines a derivative work as one "based upon one or more preexisting works," including any form in which a work may be "recast, transformed, or adapted"^[3]. Preparing derivative works is one of the exclusive rights of a copyright owner^[4]. A story that borrows Hermione Granger, Hogwarts, and the rules of wizarding magic fits that definition comfortably, so on its face most fanfiction uses material it never got permission to use.

Characters add a second layer. Courts protect well-developed fictional characters independently of the stories they appear in. In Anderson v. Stallone (1989), a court held that the Rocky characters were protected and that a writer's unauthorized treatment for Rocky IV could not claim protection of its own^[12]. The Ninth Circuit's 2015 decision in DC Comics v. Towle set out the modern test: a character is protected when it has physical as well as conceptual qualities, is sufficiently delineated to be recognizable wherever it appears, and is especially distinctive^[13]. The "character" in that case was the Batmobile.

What copyright does not protect matters just as much. Ideas, concepts, and methods are excluded by statute^[14], and tropes, genres, and general story structures are free for anyone to use. Enemies-to-lovers, found family, time loops, and the rest of the fanfiction toolkit belong to everyone. The legal risk comes from borrowing specific protected expression: recognizable characters, distinctive settings, and actual text.

Fair Use After Warhol: What "Transformative" Means Now

Fair use is fanfiction's main legal defense. Courts weigh four factors: the purpose and character of the use, including whether it is commercial; the nature of the original work; how much is taken; and the effect on the market for the original^[15].

For almost three decades, the key idea was transformation. In Campbell v. Acuff-Rose Music (1994), the Supreme Court said a use is transformative when it adds something new, with a further purpose or different character, altering the original with new expression, meaning, or message^[16]. Many fanfiction guides read that to mean any new perspective or new meaning made a fanwork transformative.

In 2023 the Supreme Court tightened that reading. In Andy Warhol Foundation v. Goldsmith, a 7-2 majority held that new meaning or message is relevant but not enough on its own^[17]. The first factor asks whether the use has a purpose that differs from the original's, and that difference is weighed against how commercial the use is. The Court also warned that transformation has to go beyond simply adapting a work into a new form, because adaptations like turning a book into a movie are exactly what the derivative work right covers. And it drew a line between commentary that targets the original, like parody, which needs to borrow from its target, and uses that borrow a work to say something else, which need a stronger justification^[17].

What that means for fanfiction:

• Commentary on the source is the strongest ground. A story that critiques canon, parodies it, or retells it to question its assumptions has a purpose the original does not.
• Continuations and "missing scenes" lean on the other factors. A fic that simply extends the story for the same kind of entertainment shares the original's purpose. Its defense rests more on being free, borrowing only what it needs, and not substituting for the original in the market.
• Noncommercial status still matters a great deal. Warhol turned on a commercial magazine license. The Organization for Transformative Works (OTW), which runs AO3, read the decision as leaving noncommercial, noncompeting fanwork use fair^[18].

Noncommercial status is not a free pass, though. In Hachette v. Internet Archive (2024), the Second Circuit treated the Internet Archive's free lending of scanned books as noncommercial and still rejected fair use, because copying entire books to serve as substitutes for them was not transformative^[19]. The Archive did not seek Supreme Court review^[20]. For fan writers the lesson is concrete: fanfiction that reproduces large amounts of canon text, such as scene-by-scene retellings or "characters read the book" stories, is the weakest kind of fanfiction even when it is free^[21].

The Public Domain Keeps Growing

The safest source material is material nobody owns. In the United States, works published in 1930 entered the public domain on January 1, 2026, and each new year releases another year of works^[11].

Sherlock Holmes is the clearest example. In Klinger v. Conan Doyle Estate (2014), the Seventh Circuit held that story elements from Holmes stories already in the public domain were free to use, and that copyright covered only the new elements added in later stories^[9]. The last Holmes stories entered the U.S. public domain on January 1, 2023^[22]. A 2020 lawsuit by the Conan Doyle estate over Netflix's Enola Holmes was dismissed that December without any ruling on the merits^[23].

Recent Public Domain Days have added characters fan writers know well:

• 2024: Mickey and Minnie Mouse as they appear in Steamboat Willie and the silent version of Plane Crazy, Tigger from The House at Pooh Corner, and J.M. Barrie's Peter Pan play^[10].
• 2025: the original Popeye, the first Tintin story, Sam Spade from the serialized Maltese Falcon, and Buck Rogers^[24].
• 2026: Betty Boop from Dizzy Dishes, Pluto in his first appearances, Blondie and Dagwood, the first four Nancy Drew books, and Miss Marple from The Murder at the Vicarage^[11].

There are two catches. Only the original versions are free: traits, designs, and plot developments introduced in later, still-copyrighted works remain protected. And trademark law is separate from copyright, so using a public domain character in a story is very different from presenting your work as official merchandise^[10].

The Cases That Define the Boundaries

The published cases involving fan-made works concern commercial or professional-scale projects, not free stories posted to a fan archive. They still show clearly where the lines are.

Salinger v. Colting: The Unauthorized Sequel

In 2009, a federal court in New York blocked publication of 60 Years Later: Coming Through the Rye, an unauthorized sequel to The Catcher in the Rye that followed an elderly Holden Caulfield. The Second Circuit vacated the injunction in 2010, but only because the trial court had applied the wrong standard for granting injunctions. It saw no reason to disturb the finding that the sequel likely infringed and likely was not fair use^[6]. The parties later settled, and the author agreed not to publish the book in the United States or Canada until The Catcher in the Rye enters the public domain^[25].

Paramount v. Axanar: Professional Fan Films

Axanar was a crowdfunded Star Trek fan film that raised more than a million dollars. In January 2017, Judge R. Gary Klausner held that all four fair use factors favored Paramount and CBS. He also found that releasing the film for free did not make it noncommercial, because the producers benefited through fundraising and professional opportunities^[7]. The case settled weeks later, with limits on the length and distribution of future Axanar films^[26].

While the suit was pending, Paramount and CBS published fan film guidelines. They allow noncommercial Star Trek fan films that run under 15 minutes (or two parts totaling no more than 30), raise no more than $50,000, keep "Star Trek" out of the title, and use amateur casts and crews^[27]. The guidelines are still enforced. When Axanar released The Gathering Storm on YouTube in July 2026, Paramount and CBS had it removed within three days^[28].

The Tolkien Estate and The Fellowship of the King

The clearest recent loss for a fan writer came in 2023. Demetrious Polychron self-published The Fellowship of the King as a sequel to The Lord of the Rings, then sued Amazon and the Tolkien Estate, claiming The Rings of Power copied his book. The court dismissed his suit, finding that his book was itself an unauthorized derivative work that was not entitled to copyright protection. In a separate suit brought by the Tolkien Estate, the court issued a permanent injunction on December 14, 2023, ordering him to destroy all copies and barring further Tolkien-based works. He was also ordered to pay about $134,000 in attorneys' fees for his own lawsuit, which the court found frivolous^[8].

The case shows two things. Selling fanfiction based on a copyrighted work invites the strongest possible response. And copyright protection does not extend to the parts of a work that use someone else's material unlawfully^[29], so a fan writer is in a weak position to accuse the original's owner of copying.

The Omegaverse Dispute: Tropes Are Not Property

The omegaverse, the alpha/beta/omega dynamic that grew out of Supernatural fanfiction, reached the courts after romance author Addison Cain and her publisher filed DMCA takedown notices against Zoey Ellis's omegaverse novels in 2018. Ellis's publisher, Quill Ink Books, sued. Cain was dismissed from the Oklahoma case for lack of jurisdiction, and in 2019 a federal court in Virginia dismissed the publisher's state-law claims against her^[30][31]. The litigation wound down without any court deciding whether omegaverse tropes can be owned.

The dispute is often described as establishing that fanfiction tropes cannot be owned, but no court actually held that. Ordinary copyright principles do point firmly in that direction, because tropes and genre conventions are ideas rather than protected expression^[14]. The dispute is better remembered as a warning that takedown notices can be aimed at works that share tropes but not text.

International Perspectives on Fanfiction Law

Japan: Tolerated, Not Legalized

Japan has no general fair use doctrine, yet doujinshi (self-published fan comics and fiction) are sold openly at events like Comiket^[32]. The system rests on tolerance and procedure rather than a legal exception. Most copyright infringement in Japan can only be prosecuted if the rights holder files a complaint, and rights holders generally choose not to. When Japan amended its copyright law for the CPTPP trade agreement, effective December 30, 2018, it made some infringement prosecutable without a complaint, but only for-profit distribution of paid works copied as-is in ways that unfairly harm the rights holder. The Agency for Cultural Affairs states that doujinshi generally fall outside those conditions^[33]. During the 2016 debate over that change, Prime Minister Shinzo Abe told the Diet that doujinshi sold at Comiket do not compete with the original works^[34].

The European Union: Parody, Pastiche, and Platform Filters

EU law has no open-ended fair use. It relies on specific exceptions, including one for caricature, parody, or pastiche. Article 17 of the 2019 Copyright in the Digital Single Market Directive made large content-sharing platforms responsible for unlicensed uploads, which raised fears that automated filters would remove fanworks^[35]. When Poland challenged Article 17, the Court of Justice of the EU (CJEU) upheld it in 2022 but set limits: filters must not block lawful content, and users must be able to rely on the exceptions for quotation, criticism, review, caricature, parody, and pastiche when uploading to those platforms^[36].

In April 2026 the CJEU defined pastiche for the first time, in the Pelham II music sampling case. A pastiche evokes an existing work while being noticeably different from it, and engages in an artistic or creative dialogue with the original that is recognizable to someone familiar with it. Humor is not required, but concealed imitation and plagiarism do not qualify, and the court stressed that pastiche is not a catch-all exception^[37][38]. Fan writers have reason to pay attention: when Germany implemented its pastiche exception, the government's explanatory memorandum listed fan fiction as an example^[39]. Much transformative fanfiction plausibly fits the new definition. Wholesale retellings likely do not.

The United Kingdom: A Character Is a Work

The UK added a fair dealing exception for caricature, parody, and pastiche in 2014^[40]. Its limits became clear in Shazam Productions v Only Fools the Dining Experience (2022), where an interactive dinner show built on the sitcom Only Fools and Horses lost. The court held that copyright subsists in the character Del Boy as a literary work, and rejected both parody and pastiche because the show borrowed the characters, backstories, and catchphrases wholesale. The judgment acknowledged that pastiche could potentially apply to fan fiction, but warned against treating it as a general fair use provision^[41].

Canada: A User-Generated Content Exception

Canada's 2012 copyright reforms added one of the most fan-friendly provisions anywhere. Section 29.21 of the Copyright Act lets individuals use published works to create new works solely for noncommercial purposes, as long as they credit the source where reasonable, have reasonable grounds to believe the source was not infringing, and the new work does not have a substantial adverse effect on the market for the original^[42].

When the Risk Isn't Copyright

In some countries, the bigger legal danger for fan writers has nothing to do with copyright:

• China: since 2024, police have arrested dozens of danmei (boys' love) writers, mostly young women publishing on the Taiwan-based site Haitang, under laws against producing obscene material for profit. Some have received multi-year prison sentences^[43]. AO3 itself has been blocked in mainland China since February 2020^[44].
• Russia: regulators blocked AO3 in 2023 and the major Russian fanfiction archive Ficbook in July 2024, as part of the crackdown under the country's laws against LGBT "propaganda"^[44][45].
• Turkey: a court in Ankara ordered Wattpad blocked in July 2024 without giving a public reason^[46].
• Age verification laws: the UK's Online Safety Act and similar laws elsewhere are pushing websites toward age checks. In November 2025, the OTW said it opposes these laws, is monitoring how they are interpreted, and does not intend to introduce age verification on AO3^[47].

Platform Policies Shape Practical Fanfiction Rights

For most writers, platform rules matter more day to day than court decisions, and they differ sharply.

Archive of Our Own

AO3 is run by the nonprofit OTW and hosts more than 18 million fanworks, with over 10 million registered users as of 2026^[1][48]. Its Terms of Service were last revised in November 2024, when they were reorganized into separate Terms of Service, Content Policy, and Privacy Policy documents^[49][50]. The content policy is famously broad, but the ban on commercial activity is strict^[51]. According to AO3's Terms of Service FAQ, you cannot ask for tips or donations, link to Patreon, Ko-fi, or similar platforms (even to free posts), or advertise paid commissions. You can post a work someone commissioned and gift it to them, as long as you do not mention payment^[52].

The OTW also supports fans legally. Its legal committee answers questions about fanworks and helps fans find lawyers^[53], and it files amicus briefs in cases that affect fan communities, including the Supreme Court's 2026 Cox v. Sony case^[47].

FanFiction.Net

FanFiction.Net takes a compliance-first approach. Its guidelines list authors and publishers whose wishes it respects by refusing fanfiction based on their work: Anne Rice, Archie Comics, Dennis L. McKiernan, Irene Radford, J.R. Ward, Laurell K. Hamilton, Nora Roberts/J.D. Robb, P.N. Elrod, Raymond Feist, Robin Hobb, Robin McKinley, and Terry Goodkind. It also does not accept explicit (MA-rated) content^[54].

Wattpad

Wattpad allows fanfiction but draws a firm line between fanfiction and "adaptations." In its policy, fanfiction uses existing characters or settings in an original story. An adaptation takes an existing work's text or unique events and changes only some elements, such as swapping in different character names, and Wattpad treats it as infringement. Crediting the original author does not fix the problem^[21]. Wattpad handles complaints through DMCA notice-and-takedown and may close the accounts of repeat infringers^[55].

Podfic and Audio Versions

Audio raises a permission question of its own. AO3's Terms of Service FAQ says you cannot post a podfic, translation, or conversion of someone else's work without their explicit permission, even if you credit them^[52]. Its Content Policy applies the same rule whether the original is a fanwork or a published book^[51]. Some creators give blanket permission in their profile or in a work's tags or notes^[52]. AO3 does not host audio files itself, so podfic creators embed audio hosted elsewhere^[52]. If you would rather listen to fanfiction than record it, see our guide on how to listen to fanfiction.

The Law of Hosting

A March 2026 Supreme Court decision strengthened the position of hosting services generally. In Cox Communications v. Sony Music, the Court held that a service provider is not contributorily liable just because it knows some users infringe; liability requires actively encouraging infringement or offering a service tailored to it^[56]. The case concerned an internet provider, not a fanfiction archive, and it does not change an individual writer's own position. It does make it harder to hold general-purpose hosts liable for what their users post.

Creator Attitudes Shape Enforcement

Whether a fanwork ever faces a challenge depends heavily on the rights holder.

Anne Rice was the best-known opponent. Beginning in 2000 she stated that she did not allow fan fiction, fans received cease-and-desist letters, and FanFiction.Net removed her category^[57]. Rice died in 2021, and her name remains on FanFiction.Net's list^[54]. Attitudes around her work have shifted, though: in 2022, the official account for AMC's Interview with the Vampire promoted a fan-story collaboration^[57].

J.K. Rowling took the opposite approach early. In 2004, her representatives said she was flattered by fan fiction and wanted it to remain noncommercial so fans were not exploited, while objecting to explicit stories that could reach children^[58].

Corporate rights holders increasingly publish guidelines instead of suing, and Paramount and CBS's Star Trek fan film rules are the best-known example^[27]. Guidelines are not law and do not take away anyone's fair use rights. They do tell creators what a rights holder is likely to tolerate, and Axanar's 2026 takedown shows they are enforced^[28].

Commercial Fanfiction: File Off the Serial Numbers

The distinction between commercial and noncommercial use is the brightest line in fanfiction law. Commercial fanfiction does have a proven path, though, and it runs through rewriting rather than licensing.

Fifty Shades of Grey began as "Master of the Universe," a Twilight fic starring Edward and Bella. E.L. James rewrote it as an original work with the characters renamed Christian Grey and Anastasia Steele^[59]. Ali Hazelwood's The Love Hypothesis (2021) grew out of a Star Wars Reylo fic^[60]. The biggest recent example is SenLinYu's Alchemised, a rewrite of the Dramione fic "Manacled," which was removed from AO3 at the start of 2025. Del Rey in the U.S. and Michael Joseph in the UK published it in September 2025 with a 750,000-copy first printing, it debuted at No. 1 on the New York Times list, and Legendary bought the film rights^[2].

These books work legally because what they keep, such as relationship dynamics, tropes, and emotional arcs, is not protected, while what they remove, meaning the characters, names, settings, and text, is. That is the practical meaning of "filing off the serial numbers."

Licensed alternatives have struggled. Amazon's Kindle Worlds let writers sell fanfiction for licensed properties starting in 2013, but it closed in 2018 and rights reverted to the authors^[61]. A far larger license, Disney's December 2025 agreement to make more than 200 of its characters available for fan-made videos on OpenAI's Sora, fell apart when OpenAI shut Sora down in March 2026^[62]. Selling recognizable fanfiction without a license remains the riskiest thing a fan writer can do, as the Tolkien case showed^[8].

AI and Fanfiction

Artificial intelligence raises three separate questions for fan writers: whether AI companies can train on fanfiction, whether AI-written fanfiction is protected, and how rights holders are treating AI-generated fan content.

Training on Fan Works

Fan archives are attractive training data. The OTW has said AO3 content was included in the Common Crawl web dataset, which is used to train AI models, before it asked Common Crawl to stop scraping the Archive in December 2022^[63]. In April 2025, a Hugging Face user published a scraped dataset of roughly 12.6 million AO3 works. The OTW filed a DMCA takedown notice, the uploader filed a counter-notice, and the dataset has since been permanently disabled^[64][65].

Courts are now drawing lines on training:

• Bartz v. Anthropic (2025-2026): Judge William Alsup held in June 2025 that training on lawfully acquired books was fair use, but that downloading pirated copies to build a central library was not^[66]. The case settled for $1.5 billion, about $3,000 per work, and the court granted final approval on July 20, 2026^[67].
• Kadrey v. Meta (2025): Judge Vince Chhabria ruled for Meta on fair use because the authors had not shown market harm, while suggesting that AI output flooding the market could harm authors in a future case^[68].
• Thomson Reuters v. Ross (2026): on September 30, 2026, the Third Circuit issued the first federal appellate ruling on AI training, holding that copying Westlaw headnotes to train a non-generative legal research tool was not fair use. The court expressly distinguished generative AI cases^[69].

None of these cases involved fanfiction, and fan writers would face an extra hurdle in bringing their own claims, because protection does not extend to the parts of a fanwork that use copyrighted material unlawfully^[29]. For now, the practical protections are at the platform level. AO3 uses technical measures against large-scale scraping, and the OTW suggests restricting works to logged-in Archive users for some additional protection^[63].

Who Owns AI-Generated Fanfiction?

Under U.S. law, purely AI-generated text has no copyright owner at all. The U.S. Copyright Office concluded in January 2025 that works are protected only to the extent a human determined their expressive elements, and that prompts alone are unlikely to be enough^[70]. In Thaler v. Perlmutter, the D.C. Circuit held in March 2025 that copyright requires a human author, and the Supreme Court declined to hear the case on March 2, 2026^[71]. A fic you write with AI assistance can still be protected for your own contributions; text a model produced on its own cannot. On AO3, nothing in the Terms of Service prohibits fanworks generated fully or partly with AI tools^[63].

Studios, Characters, and AI

Rights holders now treat their characters as the asset to defend in AI. Disney and Universal sued the image generator Midjourney in June 2025, and Warner Bros. Discovery followed that September, over images of their characters. The cases were still in discovery in mid-2026^[72]. Disney's short-lived Sora license, described above, showed the other side of the same strategy: studios will license characters for AI fan creation, but on their own terms^[62]. The character protections that shape fanfiction law now shape AI policy too.

Practical Guidance for Fanfiction Writers

Keep It Noncommercial, by Platform Standards Too

Free distribution remains your strongest position. Platform rules are stricter than the law: AO3 bans tip requests, Patreon and Ko-fi links, and commission ads on the site^[52]. And the Axanar ruling shows that free work can still count as commercial if it is used to raise money or build a business^[7].

Transform With a Purpose

After Warhol, the strongest fanfiction does something the original does not: it critiques, parodies, reinterprets, or answers its source. Avoid copying canon text at length, even inside an otherwise original story^[17][21].

Use the Public Domain

For maximum freedom, including the freedom to sell, write about characters whose original versions are now free, and check which traits come from later works that are still protected^[11].

Don't Rely on Disclaimers

A note saying you do not own the characters is a courtesy, not a legal defense. Wattpad's policy says it directly: crediting the original author does not make an unauthorized adaptation acceptable^[21].

Check Creator and Platform Policies

Rights holders' stated preferences are not law, but they predict enforcement. Check FanFiction.Net's exclusion list and any official fan guidelines before starting a large project^[54][27].

Going Pro? Rewrite, Don't Rename

If you want to publish commercially, remove the borrowed characters, names, settings, and text, and keep what is free: tropes, dynamics, and ideas. Changing names on otherwise copied material is not enough^[21][2].

Know Where to Get Help

If you receive a takedown notice or a cease-and-desist letter, take it seriously but don't panic. The DMCA provides a counter-notice process for material removed by mistake^[73], and the OTW's legal committee can answer questions and help fans find lawyers^[53]. Volunteer arts-law organizations can also help^[74]. This guide is general information, not legal advice for a specific situation.

The Bottom Line

Fanfiction's legal position in 2026 is both clearer and more demanding than it was a few years ago. Noncommercial fanfiction remains widely tolerated, and in the United States no court has found a noncommercial, transformative fanwork infringing^[5]. But Warhol made "transformative" harder to claim by simply adding a new perspective, the cases fan creators have lost involved money, and platforms enforce their own stricter rules.

At the same time, the ground available to fan writers keeps expanding. Every January brings new public domain characters, Europe now has a working definition of pastiche that fits much of fan culture, and fanfiction keeps feeding mainstream publishing. For writers who share their work freely, transform their sources with purpose, and treat commercial ambitions as a separate project that requires real rewriting, fanfiction remains one of the most open creative traditions on the internet.

Fanfiction Legality: FAQ