Convert WebM to MP4.
Turn WebM clips into MP4 for editors, phones and social platforms that don't accept WebM.
Inside The Conversion
See The Input. Inspect The Result.
A real WEBM to MP4 conversion using a sample file. Compare the files below, then use the converter above with your own file.
Recorded Sample
Converted on the server in this run.
earthrise-apollo-8.webm
earthrise-apollo-8.mp4
Previews show the sample files from this recorded conversion. Choose Input or Result to focus on one file.
View The Original Run Capture
A screenshot of the completed run, preserved in its original theme. The comparison above adapts to your current theme.
WebM vs MP4, and why you'd convert
WebM is the web's open video format, efficient and royalty-free, which is why browsers and screen recorders love it. MP4 is the universal one: every phone, video editor, messaging app and social platform accepts it. If something won't take your WebM, MP4 is the fix.
What happens to quality
WebM typically uses the VP9 (or VP8) codec while MP4 uses H.264, so the video genuinely has to be re-encoded rather than just repackaged. It's done at a high bitrate, so visually the result tracks the original closely, and the MP4 plays smoothly on hardware that can't decode VP9.
Got a screen recording?
Browser and OBS captures are often WebM. Once it's an MP4 you can edit it anywhere, or pull just the audio with MP4 to MP3 and send it to TranscriptAI for a transcript.
How it works
- 01
Add your WebM
Drop one or many files, or click to browse. Private by default.
- 02
Convert on our server
WebM becomes MP4 using a best-in-class open engine, no paid API in the loop.
- 03
Download
Grab your MP4 (or a zip of many), or open it in TranscriptAI to do more.
Best available engine, honest about limits
Private uploads, auto-deleted after 1 hour
Batch convert many at once, download as a zip
No watermark, no signup to try
Fast, faithful conversion
Direct handoff to TranscriptAI
WEBM to MP4: transcode
WEBM and MP4 are container/codec formats, so this re-encodes the video (a lossy step. Start from the best source you have). MP4 is broadly compatible, which helps when a player, editor or site won't accept WEBM.
Need more than a conversion?
Send your audio or video to TranscriptAI to generate a transcript, summary, structured notes, flashcards, quiz questions or action items: automatically.
Common questions
Is it free?+
Yes. Convert WebM to MP4 free, with no signup.
Is my file private?+
Uploads go to a private bucket, are converted, and auto-delete after 1 hour.
Will quality hold up?+
Yes. WebM and MP4 use different video codecs, so the video is re-encoded: done at a high bitrate so the result stays faithful to the source.