Convert WebM to MP4 without uploading it
WebM is an open container built for the web, used by screen recorders and browsers. MP4 is the most widely supported video container in the world, playable on every phone, browser, TV and editing app. Switch from one to the other on your own device: drop the file, click convert, download.
Drop your files here
or click to choose files. Drop several to process them all with the same settings.
Why convert WebM to MP4? Because iPhones, TVs and most editing apps do not support it well, while it plays everywhere without extra software. WebM files usually contain VP8, VP9 or AV1 video with Opus or Vorbis audio; MP4 expects H.264 or HEVC video with AAC audio.
The codecs used by WebM are not accepted by MP4, so the video is re-encoded on your device at a bitrate matched to the original. Your hardware encoder does the work, which is much faster than uploading.
Turn on “maximum compatibility” to get H.264 in the MP4. Turning it off copies the VP9 stream into MP4, which is smaller but plays only in browsers and recent players.
How to convert WebM to MP4
- Drop the WebM file. It is read straight from your disk. Nothing is uploaded, so there is no waiting and no file size cap.
- Keep MP4 selected. Leave “maximum compatibility” on so the result plays everywhere, or turn it off to always copy the streams unchanged.
- Convert and download. Preview the result and save it. The original file is untouched.
Why use myownvid for this
Nothing is uploaded
The file is read straight from your disk and processed by your browser. There is no server, so there is nothing to leak, store or delete.
Faster than any upload
Your device’s hardware encoder does the work. No queue, no upload bar, no waiting for a download afterwards.
No watermark, no account
Every tool is free with no sign-up, no export cap, no resolution limit and no logo stamped on your video.
Presets that match real limits
Discord, WhatsApp, email, Reels: pick the destination and the settings are already right.
Questions people ask
Does converting WebM to MP4 lose quality?
The video has to be re-encoded, so a tiny amount of detail is traded away. The tool matches the original bitrate so the difference is very hard to notice.
How long does WebM to MP4 take?
Re-encoding typically runs at several times real-time speed on a recent laptop or phone with a hardware encoder. A five-minute clip is done in about a minute.
Is it really free with no upload?
Yes. The page is a static website and the conversion runs inside your browser using its built-in video engine. Your WebM file never leaves your device, which is also why there is no watermark, no account and no size limit.
Can I convert several WebM files?
One file at a time for now. After downloading, click “Start over with another file” and drop the next one. Batch conversion is on the roadmap.