Converts MKV files to MP4 format — advanced video archiving with multiple subtitle tracks, chapters, and audio streams in one file to universal video playback on any device. All conversion happens locally in your browser with no file size limits.
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Re-encapsulates MP4 video files into the versatile MKV container without re-encoding the underlying video stream.
Converts legacy AVI video containers into modern MP4 files with H.264 encoding for drastically smaller file sizes.
Converts QuickTime MOV videos into the open-source MKV container format, enabling advanced subtitle support and broader codec compatibility.
Batch remux MKV video files to universally compatible MP4 without re-encoding. Smart TV and iPhone users solving format compatibility issues.
Convert between MKV, MP4, MOV, WebM, and AVI video formats. Pick any input and output format from the dropdown — your files never leave your device.
MKV (Matroska Video) uses lossless container encoding and is best for advanced video archiving with multiple subtitle tracks, chapters, and audio streams in one file. MP4 (MPEG-4 Part 14) uses lossy compressed encoding and excels at universal video playback on any device — phones, smart TVs, web browsers, and social media. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.
Yes, this tool is completely free with no usage limits, registration, or credit card required.
All processing happens locally in your browser. Your data is never uploaded to any server.
Yes. After the initial page load, the tool runs entirely offline without requiring an internet connection.
No. You can use this tool unlimited times with no quotas or restrictions.
Any modern web browser (Chrome, Firefox, Safari, Edge) on desktop or mobile. No installation needed.
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Converts legacy AVI video containers into modern MP4 files with H.264 encoding for drastically smaller file sizes.