Convert MP4 to WEBM
Turn an MP4 video into WEBM that plays everywhere — with trimming and size options, nothing to install.
Free: up to 2 min of video per file (choose a part with Start/End), up to 720p; GIF up to 20 s. Pro: 5 min, 1080p.
Private by design: this tool works entirely in your browser. Your files are never uploaded to our server. Free, no sign-up, no watermark.
How to use
- Choose an MP4 video.
- Check that WEBM is selected; set quality, resolution or a part of the video if you like.
- Press Start and wait while the server converts it.
- Watch the preview and download the WEBM file.
MP4 (H.264) plays on every phone, computer, TV and website — the safest choice for sharing.
WebM (VP9) is an open web format: small files that play in browsers, but not in every app.
Frequently asked questions
Will the quality get worse?
With “Same as original”, the video is copied into the new container without re-encoding whenever the codecs allow, so nothing is lost. Otherwise it is encoded with high quality settings.
Is there a size or length limit?
Free conversion handles files up to the size shown above and a few minutes of video. Choose a shorter part with Start and End for long videos.
What happens to my video after conversion?
It is deleted from the server automatically one hour after processing, or immediately if you press “Delete from server now”.