WebM to MP4.
For every phone and app.
Upload a WebM — a screen recording or a clip from the web — and get an H.264 MP4 with its own link.
Drop photos, videos or files here — or paste an image with Ctrl+V
Your links
Download a video
Download only what you have the right to use. Files stay on BasePic for one hour.
How it works
- Upload the WebM
Tap Upload video and pick the WebM, up to 2 GB.
- Trim if you like
The editor opens with the whole video. Keep it all, or drag the handles to cut the start or the end.
- Convert
Tap Convert to MP4. The MP4 gets its own link and a Download button; your WebM stays as it was.
VP8, VP9 and AV1 become H.264
A WebM usually holds VP8, VP9 or AV1 video, which some phones, video editors and upload forms don’t accept. BasePic re-encodes it to H.264 at good quality, with the same size in pixels.
Opus and Vorbis become AAC
The sound in a WebM is Opus or Vorbis. In the MP4 it becomes AAC, which every phone and browser plays.
How long the video can be
Re-encoding works on videos up to 15 minutes long at 1080p or 4K, up to 33 minutes at 720p, 1 hour 15 minutes at 480p and 2 hours at 360p or smaller. For a longer recording, trim it and convert it in parts.
Your link and your original
The MP4 is a new file with a Short link and a Long link, ready to share or download. The WebM you uploaded keeps its own link.
WebM to MP4: questions
How do I convert WebM to MP4?
Upload the WebM and tap Convert to MP4. The MP4 gets its own link and a Download button.
Why convert a WebM?
Many video editors, phones and upload forms take MP4 but not WebM. An H.264 MP4 with AAC sound plays almost everywhere.
Will the quality change?
The video is re-encoded once, at good quality, with the same size in pixels.
Can I trim it first?
Yes. Drag the handles to cut the start or the end — the button then says Trim now, and you still get an MP4.
Is it free?
Yes. No sign-up and no watermark.