MKV to MP4

Free online conversion of HD MKV movies to MP4 for easy playback on phones, TVs, and platforms. Browser-based, no upload, fully private.

Privacy Protection

All processing is done locally in your browser. MKV files are never uploaded to any server, fully protecting your privacy.

High-Speed Conversion

Powered by WebCodecs with hardware acceleration, quickly converts MKV to MP4 with no upload wait.

Wide Compatibility

Outputs standard MP4 compatible with iPhone, Android, smart TVs, and major video platforms.

Drag and drop video files here

or

Supports MP4, WebM, MOV, MKV, AVI, and more

Use Cases

  • Convert downloaded HD MKV movies to MP4 for playback on your phone.
  • Transfer MKV files to a smart TV or set-top box as MP4 to avoid unsupported format errors.
  • Convert MKV footage to MP4 to import into editing software (Premiere, Final Cut, etc.) for post-production.
  • Convert course recordings from MKV to MP4 for easy upload to learning platforms or sharing.

About MKV and MP4

MKV (Matroska) is an open multimedia container supporting virtually all codecs, multiple audio tracks, and subtitles — popular for HD movies. MP4 is the ISO-standard universal video container. This tool uses WebCodecs to convert MKV to H.264 MP4 entirely in your browser; files never leave your device.

Frequently Asked Questions

Why convert MKV to MP4?

While MKV is powerful, many phones, TVs, and platforms have limited support. Converting to MP4 greatly improves compatibility across all devices.

Will converting MKV to MP4 reduce quality?

Quality loss is minimal at high settings. H.264 MKV conversion loses even less; H.265 to H.264 at high quality is barely noticeable.

Will subtitles in MKV be preserved?

This tool converts video and audio tracks only. External subtitle tracks are not included in the MP4 output. Burn subtitles into the video first if needed.

Will the file size change after conversion?

MKV is just a container; size depends on the codec. H.264 MKV to MP4 is similar in size; high-bitrate or lossless encodings will shrink when converted to H.264 MP4.

What is the maximum MKV file size supported?

Supports MKV files up to 2 GB. HD movies can be large — use a capable device to avoid browser memory issues.

Will my files be uploaded to a server?

No. All processing is done locally in your browser. Files never leave your device, fully protecting your privacy.