Free video converter for MP4 and WebM

How to use

1. Select your video. Choose an MP4 or WebM file from your device. It loads straight into the browser and is never uploaded.
2. Pick the output format. Set whether you want MP4 or WebM as the converted result.
3. Lower the resolution (optional). If you want a smaller file, choose a lower resolution before converting.
4. Convert and download. Start the conversion and save the finished video back to your device when it is done.

Features

• 100% private, no upload. Your video is processed entirely on your device and never sent to a server, ideal for confidential or sensitive footage.
• MP4 and WebM both ways. Convert MP4 to WebM or WebM to MP4 depending on what your player, editor, or website needs.
• Optional resolution downscaling. Lower the resolution during conversion to reduce file size for sharing or uploading elsewhere.
• Fast modern encoding. Uses WebCodecs via Mediabunny for speed, with an FFmpeg.wasm fallback so it still works when WebCodecs is unavailable.
• Free with no sign-up. No account, no watermark, and no limits to unlock, just open the page and convert.

When to use it

• Re-encode an MP4 clip to WebM for smaller, web-friendly embedding on a site
• Convert a WebM screen recording to MP4 so it plays in apps that need MP4
• Shrink a high-resolution video by downscaling it before sharing or uploading
• Prepare a video in the right format for a platform that only accepts one of the two
• Convert confidential or unreleased footage without risking an upload to a third-party server

Is it private?

Your files are processed locally in your browser and are never uploaded.