Free online · No upload · Files stay on your device
MKV to MP4 Converter
Convert MKV (Matroska) videos to MP4 privately in your browser. Free and no upload.
How it works
Instant conversion in 3 simple steps
Everything runs locally in your browser. Fast, zero upload wait.
01
Add your file
Drag and drop the source file. It stays in browser memory — we never upload it.
02
Confirm output
MP4 is pre-selected as the target format for your MKV file.
03
Download
WebAssembly finishes locally. Save the result — nothing is uploaded.
About this converter
MKV is flexible for local libraries but MP4 is better for sharing and mobile playback. Convert MKV to MP4 online with ShortVid AI without uploading your file to the cloud.
Supported formats
Outputs we encode today. Inputs include common video and audio containers (MP4, MOV, MKV, WEBM, AVI, and more).
- MP4
- MOV
- WEBM
- AVI
- MKV
- GIF
- MP3
- WAV
Popular conversions
Why convert privately?
- No upload. Your media stays in browser memory. We do not store converter files on our servers.
- No cloud wait. Skip upload queues — conversion starts on your device with WebAssembly.
- Free & simple. No sign-up and no watermark from us on the exported file.
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Frequently asked questions
- Can I convert MKV to MP4 for free?
- Yes. Drop your MKV, keep MP4 selected, and convert locally in the browser.
- Are subtitles preserved?
- Simple remux may keep some tracks when codecs allow; complex subtitle sets may not carry over. Re-encode focuses on video and audio.
- Is my file uploaded?
- No. Everything runs on your device.
- What if conversion fails?
- Unusual codecs inside the MKV can fail in-browser. Try a smaller clip or another device with more RAM.