Compress & Convert
MKV to MP4
Make MKV files easier to preview, share, and play by converting them to MP4.
Waiting for media
Processing video...No file selected
Selected files stay on this device. File sizes shown before processing use browser metadata only, such as 1.00 MB units.
Your video is processed locally in your browser and is not uploaded to our servers. Processing starts only when you click the button — nothing happens until then.
How to use
- 1.Upload MKV - Choose the MKV file to convert.
- 2.Pick settings - Select quality and optional resolution.
- 3.Convert - The file is converted to MP4 locally in your browser.
- 4.Download - Save the MP4 output.
Features
Supported formats
Privacy
Files are handled as local browser objects. BeYourTools does not upload video or audio contents, does not store filenames, and does not send media to third-party processing APIs.
FAQ
Why might preview not work before converting?
Some browsers cannot play MKV directly, but FFmpeg may still be able to convert it.
Are subtitles preserved?
This first implementation focuses on video and audio tracks. Subtitle handling may vary by source file.
Is my video uploaded to a server?
No. This tool processes your files locally in your browser. BeYourTools does not upload, store, or send your media to a processing API.