PRIVATE BROWSER PROCESSING
Convert MP4 to WebM for a web-first video file
If the video is headed to a website rather than a general-purpose hand-off, WebM can be a useful target. Convert the MP4 locally and choose a sensible resolution.
MP4 to WebM
WebM earns its place when the destination is the web
This page encodes video with VP9 and WebM-compatible audio. VP9 can take noticeably longer to encode in WebAssembly than H.264, so lower resolution is often practical on phones.
Privacy and limitations
Processing uses FFmpeg WebAssembly locally. The video is not uploaded by this tool. Closing or refreshing the page clears the working file. Speed depends on the browser, device memory, source codec, duration, and resolution, and tools that re-encode are not lossless.
Common questions
Can I just rename the file extension?
Usually not. Renaming does not change the container or codecs inside; this page performs a real conversion.
Is my video uploaded to DJAI?
No. The source file is read and processed in your browser on your device.
Why can the first run take longer?
The browser downloads an FFmpeg WebAssembly core of roughly 31 MB the first time processing is needed; caching can help later runs.