Convert MP4 to WebM
WebM is an open, royalty-free video format supported by all modern browsers. This tool converts MP4 files to WebM with the VP9 video codec and Opus audio.
Drop a file here
or click to choose · MP4
Your files are processed on your device and never uploaded.
How to use this tool
- 1
Add an MP4 file.
- 2
Choose quality and maximum resolution.
- 3
Start the conversion and download the WebM file.
Supported formats
- Accepted
- MP4
- Output
- WebM
Limits
- Max. 125 MB per file
- Up to 10 minutes per file
- Your files are processed on your device and never uploaded.
Frequently asked questions
Is WebM smaller than MP4?
At comparable quality VP9 is often more efficient than H.264, but results vary with the content and settings.
Can I use WebM on iPhone?
Current Safari versions play WebM, but some older Apple devices and apps do not. Use MP4 for maximum compatibility.
Why is the conversion slower than MP4?
VP9 encoding is computationally more demanding than H.264.
Related tools
- Convert videoConvert videos between MP4, WebM, MOV and MKV. H.264/AAC for MP4, MOV and MKV, VP9/Opus for WebM. Adjust quality and resolution.
- Compress videoReduce video file size with H.264 and choose quality and maximum resolution. Supports MP4, MOV, WebM and MKV up to 10 minutes. Free, no watermark.