MP4 to WebM
Convert MP4 to WebM for modern web delivery where smaller VP9 or WebM files are preferred. It is useful for browser playback, embeds, and open web workflows. It is free, needs no account, and adds no watermark to your result.
MP4 to WebM
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PDF, Word, images, audio, video, archives and more
Up to 100 files · 250 MB · No account- 1Add files
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What people use it for.
What happens to your file.
The MP4 video and audio are transcoded into WebM-compatible streams, commonly VP9 video and Opus audio, with quality settings chosen for web playback.
Where it stops: Transcoding is lossy and can take time. MP4 remains the safer fallback for older devices and some editing tools.
Everything you need, without a paywall.
Common questions.
Is WebM smaller than MP4?
Often, but not always. Compare output quality and size.
Will every device play WebM?
Modern browsers do, but some older devices and apps still prefer MP4.
Does conversion reduce quality?
Slightly, because the video is re-encoded.
You might also need.
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Reduce video file size using H.264 compression with CRF quality control, optional resizing and web-optimized MP4 output.
Convert MP4 video to MOV while preserving playable video and audio streams.
Resize video to custom dimensions or common 1080p, 720p, vertical and square presets while preserving aspect ratio.