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Convert WebM to MP4

Turn WebM videos into MP4 files for the apps and sites that ask for MP4. The video is copied into the MP4 instead of re-encoded, so quality stays exactly the same and it takes seconds. VP9 and AV1 video is copied, so it plays in Chrome, Edge, Firefox, on Android and in VLC; QuickTime and older iPhones need H.264. It runs in your browser, so your videos are never uploaded.

Drop WebM videos hereChoose WebM videos

They become MP4 files right on your device.

Your files stay on this device. Nothing is uploaded.

How to convert WebM to MP4

  1. Add your WebM videos

    Drop one or more WebM files on the blue box on this page, or choose them from your device.

  2. Wait a few seconds

    Each video is rewrapped into MP4 on your device. Even large files take seconds, because the picture is copied rather than re-encoded.

  3. Download the MP4

    Play the result on the page, then download it. Each file's row says what was copied, what was converted and where it plays.

WebM to MP4: details

Input
WebM from screen recorders, browsers and websites
Output
.mp4 with the original video stream
Quality
Unchanged; the video is copied, not re-encoded
Video
VP9 and AV1 are copied as they are; VP8 needs re-encoding
Audio
Kept as it is when an MP4 can hold it (AAC, MP3, Opus, FLAC, AC-3, E-AC-3); DTS, Vorbis, PCM and others become AAC. Convert to AAC makes sound that plays everywhere
Tracks
The main video and the default audio track; subtitles and extra audio tracks are left out
Metadata
The recording date is kept; the location (GPS) is left out
Upload
None; videos are converted in your browser
Several files
Yes, add as many as you like
Price
Free

WebM to MP4: questions

How do I convert WebM to MP4?

Rewrap the video instead of re-encoding it. On tuul.io you add your WebM files and download the MP4s: the video is copied over as it is, so quality stays the same and even a large file takes seconds rather than minutes.

Will the MP4 play on my iPhone?

Recent iPhones and Macs play VP9 and AV1 in Safari, but QuickTime and older iPhones don't. Making it play everywhere needs re-encoding to H.264, which this tool doesn't do. Chrome, Edge, Firefox, Android and VLC play it.

Does converting WebM to MP4 lose quality?

No. The VP9 or AV1 video is copied into the MP4 as it is. Opus sound is kept by default, since MP4 can hold it, or converted to AAC if you choose Convert to AAC.

Why can't some WebM files be converted?

Older WebM files use VP8 video, which an MP4 can't hold. Those need re-encoding, for example with HandBrake. The file's row says when that's the case.

Are my videos uploaded?

No. The converter downloads once to your browser and then runs on your device, so your videos never leave it.

Can I convert several videos at once?

Yes. Add as many as you like; they are converted one after another and each gets its own download button.

Does it work on a phone?

Yes, in current versions of Safari and Chrome. Very large files can run out of memory on phones, so for videos over about 1 GB a computer is more reliable.

Next steps

  • Video trimmerCut the part you need out of a video or CCTV recording, without re-encoding it.
  • Video to MP3Take the sound out of any video, CCTV too, as MP3.

More video and CCTV tools

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  • MOV to MP3Save the sound of MOV videos as MP3.
  • MOV to MP4Rewrap MOV videos as MP4 without losing quality.
  • DAV to MP4Turn Dahua CCTV recordings into MP4 files that play anywhere.
  • Hikvision to MP4Fix Hikvision, HiLook and EZVIZ .mp4 files that won't play or have no sound.
  • MKV to MP4Rewrap MKV videos as MP4 without losing quality.
  • AVI to MP4Rewrap AVI videos as MP4 without losing quality.
  • TS to MP4Rewrap TS videos as MP4 without losing quality.