Glossary entry

Danmaku: What It Means on Bilibili 弹幕

Literal meaning: 'bullet curtain' — from Japanese danmaku, originally a term for dense bullet-hell gunfire in games
Where you'll see it: The defining viewing feature of Bilibili: time-synced viewer comments layered over the video at the moment they refer to

Danmaku (弹幕, pronounced dahn-moo) is Bilibili's time-synced comment layer. Short viewer reactions appear over the video at the moment they refer to — even when you are watching hours, months, or years later. Unlike a live chat, most danmaku is replayed with the video: instead of sitting in a section below the player, the audience's reactions become part of the video itself.

What it actually looks like

Press play on any popular Bilibili video and horizontal text streams across the frame — reactions, jokes, timestamps, warnings — each appearing at the exact moment it relates to. A chef flips a pancake perfectly and a wave of "666" sweeps past. A horror game goes quiet and someone types 前方高能 ("high energy ahead") seconds before the jump scare lands for everyone else.

TRY IT IN 15 SECONDS

See the same moment with — and without — the crowd.

This is a tiny, fictional scene. Use the controls to decide how much of the audience layer you want. You are always in control.

Playing with a quiet crowd

Illustrative comments by BiliGuide — not pulled from a real video.

1. Choose your viewing mode

Start here if you want to focus on the video itself. A few reactions can stay on.

2. Control the moment

Pausing freezes the example so you can read without chasing the screen.

Good first habit: watch once for the video; rewatch a highlight with danmaku when you want the shared reaction.

MINI CHECK

In this scene, what does 666 most likely mean?

Choose an answer to reveal why viewers use it here.

Why it exists

Danmaku transforms solitary watching into something closer to watching with friends. The comments aren't replies to each other; they're shared reactions anchored to the same moment of the same video, replayed identically for every future viewer. Watching a classic video years later, you experience the same comment waves the first audience did — a kind of communal time capsule.

The word comes from Japanese (danmaku, "bullet curtain"), originally describing dense bullet patterns in shooting games. The metaphor: enough comments firing at once that they form a curtain across the screen.

English equivalents you might see

Bullet comments or bullet-screen comments — common translations
Scrolling comments / overlay comments — descriptive alternatives

BiliGuide uses "danmaku" directly because it's the term anime and gaming communities already use internationally.

Practical tips for new viewers

You can turn it off. The player controls include a 弹 toggle. Nothing breaks if you prefer a clean screen.
Watch twice. Many viewers watch once without danmaku, then rewatch highlights with comments on — the second pass reveals the community layer.
Use danmaku as audience context, not a fact check. You may see reactions, jokes, timestamp hints, or explanations. They can be useful, but they are not verified subtitles or professional translation.
Read the room before you join in. Some danmaku is playful teasing between regular viewers, but tone and context vary. If a phrase feels unclear, watch first, check the glossary, and avoid copying it into a comment.

See it in context

Gaming channels like 老番茄 and music-remix channels like 红豆稀饭中 show danmaku culture at full intensity. For gentler introductions, even visual travel channels carry a light layer of timed reactions.