Convert MP4 to WEBM
MP4 to WebM. Free, in your browser, in seconds — nothing is uploaded.
Drop a file here
or browse your device — images, documents, spreadsheets, audio, video, archives, 3D models
Choose the formats
Your file never leaves this device.
How to convert MP4 to WEBM
- Drop your
.mp4file above, or click the box to browse for it. - The target is already set to
.webm. Change any option you like. - Press Convert, then Download. The file stays on your device the whole time.
About MPEG-4 video (H.264)
MP4 with H.264 video and AAC audio is the one video format that plays everywhere: phones, TVs, browsers, messaging apps and editing software.
About WebM video (VP9)
WebM (VP9 video, Opus audio) is the open web video format. It is usually smaller than MP4 at the same quality and plays in every modern browser.
What to expect
Every frame is decoded and re-encoded inside your browser, so a long clip takes a while and the tab must stay open. Set a width of 1280 for a much smaller file that still looks sharp on a phone.
Questions
Is MP4 to WEBM conversion free?
Yes. Convert Files is free, with no account, no limits and no watermark.
Is my MP4 file uploaded?
No. The conversion runs inside your browser. The file is read from your device, converted in memory and saved back to your device. Nothing is sent to a server.
What happens to the quality?
Every frame is decoded and re-encoded inside your browser, so a long clip takes a while and the tab must stay open. Set a width of 1280 for a much smaller file that still looks sharp on a phone.
Related conversions
How it works
Three steps, no account, nothing uploaded.
Popular conversions
The pairs people reach for most. Click one and the converter is set up for it.
Your most used
Based on the files you have converted on this device.
Guides
Short, practical explanations of the conversions people ask about most.
About Convert Files
Support Convert Files
Free for everyone, funded by the people who find it useful.
Questions people ask
Your files
Everything you have converted, kept in this browser. Download any of them again, any time.
Nothing here yet
Convert a file and it will appear here, ready to download again.
Formats
Every conversion this browser can do. Pairs that would not genuinely work are simply not offered.
Guides
Practical, plain-language answers about file formats and the conversions people ask about most.