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Tool · Convert
WebM to MP4 Converter
Convert WebM to MP4 online free — play recordings and downloaded clips in messaging apps, editors and players that expect MP4. 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 WebM to MP4
Drop your WebM file, pick MP4 and download. WebM is great for the web, but many apps still expect MP4 — conversion is instant when codecs match, a fast re-encode otherwise.
Tip: most WebM recordings from browsers or screen tools use VP8/VP9 — those re-encode on conversion. H.264 WebM files convert losslessly instead.
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 WebM to MP4 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 WebM to MP4 Converter?
No. WebM to MP4 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 WebM to MP4 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 WebM to MP4 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.
Why won't WhatsApp or my messaging app accept WebM?
Messaging apps standardize on MP4 for video. Convert WebM to MP4 and the clip sends and plays everywhere — the visual content stays the same.
Will quality drop when converting WebM to MP4?
Not visibly — the re-encode targets the same resolution and a high bitrate, so the result looks like the original. H.264 WebM files convert with zero loss.