MKV to MP4 Converter — Free Online, In Your Browser
MKV is a great container, but phones, TVs, and browsers often choke on it. Convert your MKV files to MP4 (H.264 + AAC), the format that plays on every phone, browser, TV, and social app. The conversion runs entirely in your browser — no uploads, no watermarks, no sign-up.
MKV to MP4 Converter
Turn MKV files into universal MP4 — free, private, in your browser.
100% Free Forever
No Sign-up
No Credit Card
Private — files never leave your browser
Unlimited Use
1 Add your MKV file
Drag & drop your MKV here
or click to browse — one video at a time
2 Quality settings
Lower CRF = better quality, bigger file. 23 is the sweet spot.
Uncheck to produce a silent video.
3 Convert & download
Working…
✅ Done — your MP4 video
How it works
- Step 1 — Drop in your MKV file. A video engine loads once in the background (~9 MB, then cached).
- Step 2 — Pick a quality preset or set CRF yourself; choose whether to keep the audio track.
- Step 3 — The video is re-encoded to H.264 + AAC MP4 locally with faststart (for web streaming) and downloads to your device.
Everyday uses
- Movie collectors — make MKV rips playable on iPhones, smart TVs, and game consoles.
- Plex/Jellyfin users — convert MKVs that direct-play poorly on older devices.
- Creators — turn MKV recordings (OBS default) into editor- and platform-friendly MP4.
- Sharers — send one MP4 everyone can open instead of an MKV half their apps reject.
Rule of thumb: CRF 23 keeps MKV quality intact in a smaller MP4 — go to 18 only for 4K sources you plan to re-edit.