justyourconvertMP4 to WebM Converter
Make WebM versions of your videos for the web.
- 100% Free
- No Sign Up
- Nothing Uploaded
MP4 to WebM
Make WebM versions of MP4 videos for websites
Drag & drop a video
or click to browse. You can also paste.
MP4, or any video, up to your device's memory.
Result-
Processed on your device. Nothing is uploaded.
Need more? Compress or trim on JustYourVideo
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How to convert MP4 to WebM
Three steps, all in your browser.
- 1
Add your video
Drop or choose a video file.
- 2
Choose settings
Pick the format and quality.
- 3
Download
Save the converted video.
MP4 to WebM Converter: what to know
WebM is an open, royalty-free video format designed for the web, usually VP9 or VP8 video with Opus audio. Every current major browser plays it, and VP9 often compresses more efficiently than H.264, so websites commonly offer a WebM version of a video next to an MP4 fallback.
Converting MP4 to WebM always re-encodes: the H.264 or HEVC video is decoded and encoded again as VP9 or VP8, and the AAC audio as Opus. This runs in your browser with WebCodecs, so your video stays on your device. Re-encoding takes time and is slightly lossy, so start from the best-quality original you have.
Whether the WebM ends up smaller than the MP4 depends on the content and settings; compare both before publishing. Encoding speed depends heavily on your device, since VP9 encoding is demanding and may not have hardware acceleration. Long or high-resolution videos need more memory and patience.
Popular uses
- Background and hero videos on websites
- Product demos and tutorials embedded in web pages
- Web apps and open-source projects that prefer open formats
- Serving smaller files to browsers that support WebM
Tips for the best result
- Keep the MP4 too and serve both with the HTML video element.
- Remove the audio track from silent background videos.
- Resize to the display size before converting to save encoding time.
- Compare the WebM and MP4 side by side at full screen before publishing.
Read how JustYourConvert works and our privacy details. Keep your original files and check a converted file before you replace anything.