offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers

MKV to MP4 Converter

Convert MKV (Matroska) video files to MP4 format for better compatibility across devices and platforms.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Source file

Files are processed locally in your browser using WebAssembly.

Quality (CRF)

Lower = better quality (0-51, default: 23)

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.