AO3 Tags, Explained
Archive of Our Own's tagging system is the most powerful in fandom — and the most overwhelming. This guide explains 1044 of the most common AO3 tags: what each one means, what to expect when you open the fic, and which tags to pair (or exclude) when filtering.
Genre & Tone
All 165 tags →Tags that tell you how a fic will feel before you open it — fluff, angst, crack, and every shade in between.
Relationship Dynamics
All 146 tags →Tags describing how the central relationship works: how it starts, how slowly it burns, and what stands in the way.
Family & Friendship
All 94 tags →Tags for platonic bonds, found family, kid fic, and friendship-centered stories.
Alternate Universes
All 110 tags →Alternate Universe tags — every way fandom relocates beloved characters into new settings and timelines.
Settings & Events
All 98 tags →Tags for specific scenarios, holidays, and points on the canon timeline.
Crossovers & Fusions
All 4 tags →Tags for stories that mix two or more fandoms together.
Plot Devices
All 158 tags →Plot-device tags: time loops, amnesia, soul bonds, fake relationships, and other engines of fanfic plots.
Content Warnings
All 116 tags →AO3 archive warnings and content tags that help readers make informed choices about what they read.
Format & Structure
All 69 tags →Tags describing how a fic is written: length, point of view, epistolary formats, and experimental structures.
Fandom Events & Meta
All 35 tags →Tags tied to fandom events, challenges, exchanges, and the culture of posting on AO3.
Romance, Identity & Ratings
All 49 tags →Tags covering ratings-adjacent content, romance intensity, and character identity.
New to AO3 tags?
Start with our AO3 filtering guide to learn how to combine and exclude tags, or browse the fanfic glossary for fandom slang that doesn't appear in the tag system.
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