Convert Video to MP4 for Free

MOV, AVI, MKV, WebM, FLV and other video formats are supported

🔒 Nothing is uploaded to a server — all processing happens on your device

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MOV, AVI, MKV, WebM, FLV and other video formats are supported

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How it works

Converto re-encodes your video into the widely supported MP4 (H.264/AAC) format using an in-browser build of FFmpeg. You choose a compression level, and the tool re-encodes video and audio locally, without ever sending the file to a server, so the process stays fast and private.

Frequently asked questions

Why convert a video to MP4?

MP4 with H.264 video plays on virtually every device, browser, and social platform, so converting older or less common formats like MOV, AVI, MKV or WebM to MP4 makes a video easy to share and play back anywhere.

Will converting to MP4 reduce my video quality?

Choosing 'Minimal compression' keeps quality close to the source; 'Balanced' is the default and works well for most videos, while 'Strong compression' produces a smaller file at a visible quality tradeoff.

Does converting to MP4 upload my video anywhere?

No — the entire conversion happens locally in your browser via WebAssembly, so your video file never leaves your device.