MP4 ↔ WebM
Convert between MP4 and WebM in either direction, fully in your browser.
This browser cannot encode the selected output. Recommended support: MP4, MOV, and M4A need AAC/H.264 encoding in Chrome, Edge, or Safari 26+; WebM output works in Chrome, Edge, Firefox 130+, and Safari 26+. MP3 uses a local encoder extension. WAV output is uncompressed and may create large files.
Some browser screen recordings can be missing standard video metadata. Re-exporting from the recording app or a video editor usually fixes conversion failures.
Drop videos here or click to browse
Free files are limited to 500.0 MB. Pro supports up to 4096.0 MB per file.
Related Tools
MOV-to-MP4 and MKV-to-MP4 exist as their own dedicated conversions rather than folding into a single "convert anything" tool, since MOV and MKV are container formats that can hold different codecs inside — the actual conversion work depends on what's encoded inside the container, not just the file extension. Video-to-Audio is a different job entirely: it discards the video track and re-encodes just the audio, which is the right tool when only the sound from a video is actually needed, rather than running a full video conversion just to extract it afterward.