Free online converter · No signup
Free MKV to MP4 converter
Convert MKV to MP4 online free — remux when possible, re-encode when needed.
Video to MP4 converter
FreeConvert MOV, AVI, MKV, or WebM to MP4 in the browser — free, no upload.
- 1. Choose file
- 2. Convert
- 3. Download
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How to use this tool
Steps for this page, plus privacy basics.
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MOV · AVI · MKV · WebM → MP4. Max ≤1024 MB. Remux first, re-encode if needed.
Image conversion, rescale, frame extract, and text overlays on thumbnails are free. Social video download is free when a public file is available. AI thumbnail face replace uses Studio plan credits. No credit card for free tools.