Unpack a Video
Take the container apart: audio, subtitles and a poster frame.
- Add
- Adjust
- Make
- Keep
How to use this tool
- Add your files — drag them onto the page or choose them. They stay on your device.
- Add the file — the tool probes what is inside (video, audio, subtitle tracks) and lists each stream.
- Run it: every stream is written out untouched, byte-identical to how it sits inside the container.
- Press “Unpack” and download the results, individually or as one ZIP.
About this tool
Take the container apart: audio, subtitles and a poster frame. Free and unlimited, and nothing is uploaded: it all runs in your own browser. Everything is analysed and produced on your own device — nothing is uploaded anywhere, and you can verify it: the tools keep working even offline.
Privacy & limitations
Files over roughly 2 GB, or long 4K videos, can exhaust the browser's memory — everything runs on your machine, so your machine is the limit. Streams come out in their native codec and format; a stream that was H.264 inside MKV arrives as raw H.264 in an MP4-friendly box only when the container allows a lossless swap.
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Frequently asked questions
What is actually inside a video file?
A container holding separate streams: one or more video tracks, one or more audio tracks, often subtitles, and metadata describing how they line up. The extension names the container, not what is in it.
Is the audio re-encoded?
Not if it can be avoided. The soundtrack is copied out bit for bit into whichever container suits its codec, so nothing is lost. An MP3 is added only when the original codec is one that little software opens.
Why is there no subtitle file?
Because the video has no subtitle track. Captions burned into the picture are part of the image and cannot be separated out.
Where does the poster frame come from?
A third of the way into the clip, which is almost always more representative than the first frame, since videos so often open on black.