WebM to 3GP Converter
Convert WebM to 3GP free — no upload, no signup
To convert WebM to 3GP, drop your WebM video into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Shrink WebM clips into 3GP for basic phones.
Drop videos here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
If the video already uses codecs that fit the new format, Fylo repackages it instantly with no quality loss.
Advanced
How to convert WebM to 3GP
Add your WebM videos
Drag and drop WebM files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Choose quality (optional)
Balanced quality suits most videos. If the codecs already fit 3GP, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each 3GP file or all of them as one ZIP.
Why convert WebM to 3GP?
Basic phones can't decode VP8/VP9. 3GP with H.264 Baseline plays on nearly all of them.
What happens when you convert WebM to 3GP?
The video is re-encoded at up to 720p with 96 kbps AAC audio, giving small files with reduced detail.
How does Fylo convert WebM to 3GP?
Fylo reads the WebM with ffmpeg compiled to WebAssembly and writes H.264 Baseline profile capped at 720p with 96 kbps AAC audio. WebM's usual codecs (VP8, VP9, AV1) can't go into 3GP as-is, so the video is re-encoded. Speed depends on your device: short phone clips take seconds, while on our slow test PC a 2-minute 1080p video took about 10 minutes. Only the first video and audio track are kept, and larger videos are scaled down to 720p (or 480p if you choose it).
What's the difference between WebM and 3GP?
WebM was announced by Google in 2010 as an open, royalty-free alternative to H.264 for HTML5 video. It's a subset of Matroska restricted to VP8, VP9 or AV1 video and Vorbis or Opus audio. Browser screen recorders and many web tools save WebM by default.
3GP was defined by the 3rd Generation Partnership Project for 3G mobile phones and MMS messaging. It's based on the same ISO media structure as MP4 but restricted to phone-friendly codecs such as H.263 or H.264 Baseline video and AMR or AAC audio.
Learn more: WebM format guide · 3GP format guide
| Property | WebM | 3GP |
|---|---|---|
| Developed by | 3rd Generation Partnership Project (3GPP) | |
| Introduced | 2010 | 2002 |
| Typical video codecs | VP8, VP9, AV1 | H.263, H.264 (Baseline) |
| Typical audio codecs | Vorbis, Opus | AMR, AAC |
| Plays in web browsers | Yes — Chrome, Edge, Firefox, Safari 14.1+ | Partly |
| Compatibility | Browsers, Android; limited in editors and on iPhone apps | Old feature phones, most media players |
| Best for | Royalty-free web video, screen recordings | Very small videos for old phones and MMS |
Frequently asked questions
Can I make it smaller?
Choose 480p under Advanced.
Will the colours change?
Colours stay the same; only detail is reduced.
Is my WebM file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your WebM file is read directly from your device and never sent anywhere.
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