Convert WebM to MP4
Turn WebM recordings into MP4 files that play on every device.
Going the other way? Convert MP4 to WebM
- Formats
- WEBM
- Max size
- 4 GB
- Price
- Free
Drop files here
or browse your device · paste with Ctrl/⌘ V
WEBM · up to 4.00 GB per file
Related tools
How to convert WebM to MP4
- Add your WebM videos — up to 10 at a time, up to 4 GB each.
- MP4 is already selected; there's nothing else to set.
- Click Convert and download your MP4 files.
What is WebM?
WebM is an open web video format (VP8, VP9 or AV1 video with Opus or Vorbis sound), common for browser screen recordings and web clips. Many phone galleries, editors and messaging apps don't accept it.
What is MP4?
MP4 is the most compatible video format: it plays on phones, browsers, TVs and in every editor. Inside it usually holds H.264 (sometimes HEVC or AV1) video with AAC sound.
What changes when you convert WebM to MP4
When the video and sound inside can go into MP4 as they are, they're copied without re-encoding — fast and with no quality loss. Otherwise they're re-encoded with your browser's encoder.
Does converting WebM to MP4 reduce quality?
Not when the streams can be copied as they are (common for WebM to MP4). If they have to be re-encoded, the default quality keeps the difference hard to see.
Will the MP4 be smaller than the WebM?
About the same in most cases — check the result screen, which shows both sizes.
Can I convert several WebM files at once?
Yes — up to 10 files of 4 GB each in one go. Several results download together as a ZIP.
Is my video safe?
Yes. Your video is only used to create your result — it’s never shared and never used to train AI.
Which browsers work?
Recent Chrome, Edge and Safari 17+ work best. Firefox supports most tools; if a codec isn't available we'll tell you.