MKV to MP4
MKV to MP4 is a free online video converter for changing MKV files into MP4 files. MKV to MP4 accepts 2 MIME types, returns video/mp4, includes 1 setting, and runs in your browser on the device.
Drop .mkv file here
or click to choose
Options
Key facts
- Input
- 1 format: MKV (video/x-matroska, video/mkv)
- Output
- MP4 (video/mp4)
- Runtime
- your browser on the device
- Settings
- 1 control: Quality (CRF)
- File mode
- 1 input file creates 1 output file
- Cost
- $0, no account required
How to use MKV to MP4
- 1
Open your MKV file
Drop your MKV file onto the page, or click to browse and pick one from your device.
- 2
Choose options
Adjust the conversion options to suit your needs. Defaults work well for most inputs.
- 3
Convert and download
Click Convert. Your MP4 file is ready to download in seconds.
MKV to MP4 details
First, MKV to MP4 reads MKV source files and prepares MP4 output for the video workflow. Next, The visible controls are Quality (CRF). Additionally, Files and text stay in the browser session.
Re-encode an MKV file to MP4 with H.264 video and AAC audio so it plays on every phone, TV, and editor. We re-encode rather than remux because MKV files often contain codecs (HEVC, FLAC, subtitles) that MP4 doesn't carry the same way; re-encoding guarantees a clean, broadly compatible result. The conversion runs locally via ffmpeg.wasm, so your file never leaves your device. Performance depends on your CPU: expect roughly real-time encoding for short clips (a 5-minute 720p video may take 1;2 minutes). Sources taller than 1080p are automatically downscaled to 1080p so the browser does not run out of memory mid-encode; for best results keep inputs under about 500 MB.
Common searches
- mkv to mp4
- convert mkv to mp4
- mkv to mp4 converter
- change mkv to mp4
- mkv mp4 converter
- matroska to mp4
Related tools
Tools that work with the same formats — most users open one of these next.
MP4 to MKV
Remux MP4 to Matroska (MKV) — fast, lossless, no re-encoding.
Video Trimmer
Cut a clip from a video file — MP4, WEBM, MKV, MOV, AVI — in your browser.
Compress Video
Shrink a video file by re-encoding to H.264 with a quality preset — free, in-browser.
WebM to MP4
Convert WebM video to MP4 (H.264 + AAC) — free online, no upload.
AVI to MP4
Convert AVI video to MP4 (H.264 + AAC) — free, runs entirely in your browser.
MOV to MP4
Convert MOV (QuickTime) video to MP4 (H.264 + AAC) — free online.
Frequently asked
What is MKV to MP4?
MKV to MP4 is a free online video converter for changing MKV files into MP4 files. MKV to MP4 accepts 2 MIME types, returns video/mp4, includes 1 setting, and runs in your browser on the device.
What files does MKV to MP4 accept and create?
MKV to MP4 accepts MKV files (video/x-matroska, video/mkv) and creates MP4 files (video/mp4). The page includes 1 setting: Quality (CRF).
Do my files and data stay private?
Yes. MKV to MP4 runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How do I use MKV to MP4?
Open MKV to MP4, drop in your MKV file, choose any options, and click Convert. Your browser does the work locally and produces a MP4 file you can save right away.
What is the maximum file size for MKV to MP4?
Because MKV to MP4 runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.