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Tool · Convert
MP4 to WebM Converter
Convert MP4 to WebM online free — the web-native format: smaller files that play in every browser. No upload, no watermark.
Drop a video here
MP4, WebM, MOV, MKV — anything your browser can decode.
PRIVATE BY DESIGN — PRIVATE BY DESIGN — decoding, processing and encoding all run in your browser's engine. No server sees your file.
How to Convert MP4 to WebM
Drop your MP4 file, pick WebM and download. WebM compresses video efficiently and every modern browser plays it natively — perfect for websites and HTML5 embeds.
Tip: WebM uses the royalty-free VP8/VP9 codecs — no licensing worries for commercial sites, and noticeably smaller files at equal quality.
FORMATS
Common conversion pairs
MP4 → WebM
MP4 to WebM is perfect for the web — WebM compresses well and plays natively in all modern browsers. Same codec? Instant lossless swap; otherwise a fast re-encode.
MOV → MP4
MOV to MP4 is the most common swap: iPhone and camera MOV files play everywhere once converted. Fast lossless copy when the codec matches.
MKV → MP4
MKV to MP4 fixes compatibility: TVs, phones and editors often reject MKV. Quality is untouched — conversion runs entirely in your browser.
WebM → MP4
WebM to MP4 for sharing: messaging apps and older players expect MP4. Re-encode keeps quality with a universal format.
MP4 → MOV
MP4 to MOV for editing workflows: Final Cut and some NLEs prefer MOV. Lossless container swap when the codec already matches.
MP4 → MKV
MP4 to MKV for archiving: MKV handles subtitles, chapters and multiple audio tracks. Lossless container swap on matching codecs.
FAQ
Frequently asked questions
Is MP4 to WebM Converter really free?
Yes — completely free, with no hidden fees, no premium tier and no signup required. The tool runs entirely in your browser.
Do I need to install anything to use MP4 to WebM Converter?
No. MP4 to WebM Converter works directly in your browser. There is no software to install, no app to download and no plugin required.
Is my video uploaded to a server when I use MP4 to WebM Converter?
Never. All processing happens locally on your device. Your file never leaves your computer, which is why there is no upload wait and no privacy risk.
Which video formats does MP4 to WebM Converter support?
It accepts MP4, WebM, MOV and MKV — anything your browser can decode. Output is MP4 by default, playable on any device.
What happens to my file after processing?
Nothing is stored anywhere. Once you close the tab, everything is gone. We have no server, no storage and no access to your files.
Will my video have a watermark?
No — every download is 100% watermark-free. EditVideo never adds logos, branding or watermarks to your files.
Is WebM better than MP4 for the web?
For pure web use, yes — VP8/VP9 compress more efficiently than typical MP4 codecs, so pages load faster with smaller files. For sharing and messaging, MP4 remains the safer universal choice.
Will WebM play on phones?
Yes — Android plays WebM natively in browsers and apps; iOS Safari supports it from iOS 17. For guaranteed compatibility everywhere, MP4 is still the safer choice.