How to post fanfiction on AO3: invites, works, tags and kudos

AO3, the Archive of Our Own, documents itself better than almost any platform in web fiction: an FAQ that walks through invitations, posting, tags, series, collections and reader feedback one page at a time, maintained by the Organization for Transformative Works, the group that runs the archive. This guide follows those pages. The philosophy underneath comes from the archive's own Terms of Service FAQ, which states the rule in one line: "If it's a fictional fanwork that is legal to post in the United States, then it is welcome on AO3."

That philosophy has a mechanical consequence worth naming before any field on any form: AO3 handles content with metadata rather than removal. Every work must carry a rating and a warning choice, readers screen and filter by those choices, and legal fanwork stays up. Your rating and warnings are not decoration; they are the archive's compliance system doing its work through your form fields.

Getting an account: the invitation system

You cannot simply sign up. Invitations are required to create an account, and they arrive in two formats, a link or a token (a string of letters and numbers). The invitations FAQ explains the reasoning plainly: the archive adds users gradually so that account numbers never exceed what its hardware, bandwidth and Support team can handle.

There are two ways in:

• The automated queue. Select "Get Invited!" below the Welcome message on the homepage while logged out, add your email to the Invite Requests list, and wait; invitations are sent first-come, first-served. The Invite Requests page shows the current queue length and how many invitations go out per day, and you can look up your own position to estimate the wait.
• An existing user. Accounts hold invitations they can send. Users can no longer request new invitations, but they can distribute any they already have, and people running a challenge can request more through Support for their participants. (An account is required to take part in gift exchanges and prompt memes at all, which is why challenge invitations exist.)

Two details the FAQ is candid about. Donating to the Organization for Transformative Works does not speed anything up: invitations are never provided in exchange for donations, because the archive is committed to serving fans regardless of financial situation. And a personal invitation exposes your username, and potentially your email, to the person who sent it; the queue keeps that private.

Creating the work

From the Post menu, choose New Work. Six fields are mandatory: Rating, Archive Warnings, Fandoms, Work Title, the language, and the Work Text itself. Miss one and a warning banner appears at the top of the page instead of a posted work.

Before the fields, one habit: compose off the site. The posting form has no auto-save, and drafts are deleted one month after their creation date regardless of how recently they were edited, with the content unrecoverable. The FAQ repeats this warning on nearly every page, which tells you how often it has had to. Write in your own editor, keep the backup, paste in, Preview, then Post.

Around the core fields:

• The Fandoms field prefers full names over abbreviations, and works that belong to no fandom at all are allowed through the "Original Work" fandom tag.
• A summary is optional; AO3's own tutorial calls it "a bit like the blurb you find on the back of a book jacket", so the craft is the craft of any selling description (how to write a book blurb).
• Co-authors must be existing AO3 accounts, and once added they cannot be removed from the work by you or even by Support; they can edit their chapters, delete the work, and add it to their series.
• Works already hosted elsewhere can be imported rather than pasted, though success depends on the source site: FanFiction.Net and Quotev are named outright as sites that do not work, and you must own the work or have its owner's permission.
• For multi-chapter works, set the expected total. The blurb shows "Chapters: 2/5" or "Chapters: 2/?" and readers read the question mark as "the author doesn't know"; fill in the total with the last chapter so the work reads complete. Chapters are added after posting through Add Chapter, and chapters do not get their own tags, only the work does.
• Backdating exists for reposts, from 1950 onward, at whole-work or per-chapter level; a backdated work still announces itself to subscribers but drops out of default date-updated listings.
• Pure test works count as non-fanworks under the Terms of Service; the site provides a Testing fandom for them.

The ratings

Ratings measure content intensity, in the FAQ's own framing, and there are five choices:

• General Audiences: unlikely to be disturbing to anyone, suitable for all ages.
• Teen And Up Audiences: may be inappropriate for audiences under 13.
• Mature: adult themes (sex, violence) that are not as graphic as explicit content.
• Explicit: explicit adult themes, such as detailed sex scenes or graphic violence.
• Not Rated: the default if you prefer not to rate, and for searching, screening and other archive functions it may be treated the same as mature and explicit content.

Readers opening a Not Rated, Mature or Explicit work see an adult-content confirmation unless they have turned it off in their preferences. A misleading rating is not a private matter, either: the Policy & Abuse committee may ask a creator to change one, or change it to Not Rated for them.

The Archive Warnings

The archive requires that creators either warn for, or explicitly choose not to warn for, a short defined list:

• Graphic Depictions Of Violence: gory, graphic, explicitly described violence; where the line sits is the creator's call.
• Major Character Death: best judgment on who counts as major, though readers generally expect it for a major canon character.
• Rape/Non-Con: borderline cases are the creator's call, with an escape hatch below.
• Underage: descriptions or depictions of sexual activity by characters under eighteen; kissing and vague references do not count, and for thousand-year-old vampires with teenage bodies the FAQ's instruction is "use your best judgment".

Two escape hatches can be combined with any of these: No Archive Warnings Apply, when none of the four fit, and Choose Not To Use Archive Warnings, the legitimate way to withhold warnings, including to avoid spoiling a twist. The borderline case has a documented answer too: where you suspect non-con but decline the warning, the FAQ suggests an Additional Tag like "Dubious Consent" so readers can still make an informed choice. Failure to use appropriate warnings can draw user complaints and action from the Policy & Abuse committee, which is the stick behind the metadata system described at the top.

Tags, and how a fandom is structured

Nearly all work metadata on AO3 is tags: Rating, Warnings, Fandoms, Category, Relationships, Characters, Additional Tags. Three structural facts:

• Wrangling. Tags are organized by tag wranglers, volunteers in the Tag Wrangling committee, who attach synonyms to canonical tags. Autocomplete only suggests canonicals; you can always ignore it and type a new tag in full. The FAQ records the archive "reaching 30,000 canonised fandoms", its own spelling, which gives a sense of the catalog's scale.
• Hierarchy. Tags nest from Media down to Fandom, and inside a fandom to Characters, Relationships and Additional Tags, which is why characters from your fandom surface first in autocomplete when you post into it.
• Convention. Relationship tags use a slash for romantic or sexual relationships and an ampersand for platonic ones, and each is limited to 150 characters.

The FAQ's tagging craft, condensed: put each tag in its right field; keep one concept per tag; use full character names, because a tag must stand alone without context; remember that commas split tags. The Category field (F/F, F/M, Gen, M/M, Multi, Other) marks the kinds of relationships depicted. Additional Tags carry everything else, and the tutorial names their job explicitly: Alternate Universe tags (omegaverse has canonical ones), crossover and fusion tags, genres, tropes, and warnings beyond the core four. The vocabulary those tags speak is fandom's own (fan fiction, alternate universe, crossover).

Series, collections and challenges

Three ways to group related content exist, and they cannot be converted into each other after posting:

• A multi-chapter work is one work, listed once, with chapters inside it.
• A series is an ordered set of works by one creator or set of co-creators; each work keeps its own tags, readers move through it with Previous Work and Next Work links, and anyone can subscribe to a series to hear about new installments. On index pages a series displays the combined warnings and tags of all its works, and the rating of its most explicit work.
• A collection groups works and bookmarks under a theme with no fixed order. Collections can be Open, Closed, Moderated or Unmoderated, and challenge collections add Unrevealed and Anonymous settings that hide the work or the creator's name until the reveal. Prompt memes and gift exchanges run inside collections, and works can be gifted to named recipients who do not need accounts.

Kudos and comments

Kudos, the archive's one-tap appreciation (the word is ancient Greek for glory or renown, per the FAQ), come with hard rules: one per reader per work even across multiple pseuds, none per chapter, though every work in a series earns separately. Only the 50 most recent logged-in users display by name, guests are counted in aggregate, and kudos cannot be deleted or disabled. Comments thread at the end of each work or chapter, accept HTML, run to 10,000 characters, and allow anonymous commenters unless the creator turns that off (guests can still leave kudos); comment moderation is a per-work option, and the blurb's comment count includes replies and the creator's own comments. What to put in the notes that surround chapters is its own craft (author's notes on serial platforms).

What AO3 does not publish

No traffic figures, user counts or author earnings appear anywhere in the pages fetched for this guide; the archive does not publish them, so this guide quotes none. The pages also describe no author payment mechanism: money is not the archive's business, and where fandom monetization exists it runs off-platform (Patreon advance chapters). For the writing itself, start with how to write fan fiction; for how the archive compares with the original-fiction platforms, see where to publish a web serial. One contrast worth knowing: Royal Road takes a stricter line than AO3's openness, requiring any work built on someone else's world to carry an explicit fanfiction tag (how to post on Royal Road).