Bilibili is one of the few large platforms that never abandoned long video. While the rest of the industry chased short vertical clips, it kept hosting documentaries, lectures, analysis, cooking programmes and essays that run to forty minutes or an hour, and its audience kept watching them.
It is also the home of an enormous amount of music. The Vocaloid scene that produced Hatsune Miku and an entire genre of software-voiced pop lives substantially on Bilibili and the Japanese site that inspired it, alongside covers, remixes, instrumentals and original composition posted by people with no label behind them.
Both of those make audio extraction genuinely useful rather than a novelty. A long documentary works perfectly well as listening, and a music upload frequently has no other distribution at all — there is no streaming service release to go and find instead.
Why people extract Bilibili audio
Length. Forty-minute and hour-long uploads are normal there, and streaming that over an inconsistent international connection is a poor experience compared with holding the file.
Access. Bilibili is oriented towards mainland China and playback from elsewhere is often slow, which makes a single download considerably less frustrating than repeated buffering.
And the music. For independent uploads with no commercial release anywhere, the platform copy is the only copy, and it is not guaranteed to be there next year.
Taking audio from a Bilibili video
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1
Copy the Bilibili address
Take it from your browser or use the share control. BV-code addresses, older av-number forms and short b23.tv links all work.
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2
Deliver the video link here
Paste it into the field at the top of this page, which begins reading it at once.
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3
Take the audio stream
Where a separate audio track is exposed it appears beneath the video versions, at a fraction of their size.
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4
Keep it for listening on Bilibili
Tap the row when it turns blue. Downloads on Android, the Files app on an iPhone, ready for any audio player.
What Bilibili audio is worth taking
The platform's mix makes some of this considerably more valuable than ordinary video-to-audio extraction.
Music that exists nowhere else
A great deal of the music on Bilibili is independent work posted directly by the person who made it, with no label, no distributor and no release on any streaming service. For those uploads there is no better source to go to, because none exists.
That also makes it fragile. Accounts go quiet, uploads are removed over sample clearance, and a cover or an original composition that circulated for years can disappear without any announcement.
For long documentaries and lectures the case is simpler: the picture is frequently a slideshow or a static image, and taking an hour of video when you intend to listen is a waste of storage and data.
Bilibili audio questions
Does every video offer separate audio?
Only where the stream is exposed. The list will show what exists for that video.
Will the danmaku comments affect the audio?
No. Comments are drawn over the picture by the player and are not part of any stored file.
Do b23.tv short links work?
Yes, along with BV-code and older av-number addresses.
How do I handle a multi-part video?
Each part has its own address, so they are taken one at a time.
Can I extract from member-only content?
No. That requires an account with access.
What quality is the audio?
Whatever was in the video. Music uploads are frequently encoded better than ordinary content, since the uploader cared.
Where does the MP3 save?
Downloads on Android, the Files app on an iPhone.
Why will my link not load?
Access from outside mainland China is inconsistent, and the upload may have been removed. Both are worth ruling out.
Is there a Bilibili limit?
No cap and no queue.
Is extracting audio acceptable?
A lecture or documentary you want to listen to is ordinary. Much of the music there is independent work by identifiable people, frequently their only release, and passing it off or redistributing it is a different matter from keeping a copy.