Convert WebM to MP4
Turn browser and screen recordings in WebM into MP4 that editors and phones accept.
Files are processed on our server in Europe. Download links expire after 60 minutes; files are then deleted automatically.
Why use Video Compressor
Private and secure
Your video is sent over an encrypted connection to our server in Europe and stored under a random ID. It is never shared with third parties or used to train AI. Download links expire after 60 minutes; files are then deleted automatically, normally within 75 minutes. Read the privacy policy
Honest results
Choose quality and resolution. Progress comes from the encoder itself, and the result shows the exact size of your MP4 next to the original.
Free, no sign-up
Video Compressor is free with no account, no watermark and no ads. It works in any modern browser on phone or desktop.
In short
WebM to MP4 converts WebM videos with VP8, VP9 or AV1 video and Opus or Vorbis audio into MP4 with H.264 and AAC. That makes browser recordings and web downloads usable in iMovie, Premiere, PowerPoint and on older iPhones. Files up to 1 GB and 30 minutes are supported.
| Accepted formats | MP4, MOV, M4V, 3GP, WebM, MKV, AVI, WMV, FLV, MPEG, MTS/TS, OGV |
|---|---|
| Maximum file size | 1.00 GB |
| Output | MP4 (H.264 video, AAC audio), max 1080p, never upscaled |
| Video limits | Up to 30 minutes, up to 4K input |
| Target size | Not on converter pages; the video compressor sets target sizes |
| Units | 1 KB = 1,000 bytes; 1 MB = 1,000,000 bytes |
| Where files are processed | On our server in Europe; not sent to third parties |
| Retention | Download link expires after 60 minutes; files deleted automatically, normally within 75 minutes |
| Price | Free, no account, no watermark |
| Typical sources | Browser-based screen recorders, Loom-style tools, Chrome and Firefox MediaRecorder, web video downloads |
| Codecs read | VP8, VP9 and AV1 video; Opus and Vorbis audio |
How to use it
- Choose or drop your WebM file (up to 1 GB, 30 minutes), or import it from a link.
- Keep the High quality preset, or pick a lower resolution if you also want a smaller file.
- Select Convert to MP4 and keep the tab open while it uploads and converts.
- Preview the MP4 and download it.
Why convert WebM to MP4?
WebM is the open format browsers use for recording and streaming. Many video editors, presentation apps and older Apple devices don't import it, and some social platforms reject it. MP4 with H.264 is accepted almost everywhere.
Transparent WebM videos
WebM can carry a transparent background (VP8/VP9 alpha). H.264 MP4 has no alpha channel, so transparent areas become solid in the MP4.
Questions
Is WebM to MP4 conversion lossless?
No. The video is re-encoded to H.264, which is lossy, but converter pages start at the High quality preset, where the difference is hard to see at normal viewing size. The picture is never upscaled, and the shorter side is capped at 1080 pixels.
Why does my screen recording have no sound after conversion?
If the original WebM has no audio track, the MP4 won't either. Check that microphone or tab audio was enabled when recording.
What happens to my file after conversion?
It's stored under a random ID on our server in Europe. The download link expires after 60 minutes and the file is then deleted automatically, normally within 75 minutes. Canceling deletes it immediately.
Convert other formats to MP4
Related tools
- MKV to MP4Turn Matroska MKV recordings into MP4 for phones, TVs, editors and upload sites.
- MOV to MP4Turn QuickTime MOV files from iPhone, Mac and cameras into MP4 that plays everywhere.
- OGV to MP4Make Ogg Theora videos play in Safari, on iPhone and in video editors.
- Video compressorMake any video smaller, with a target size.
Last reviewed October 31, 2026.