MKV to MP4 Converter — Free, No Upload | Input and conversion guide
Moves an MKV video to MP4, re-encoding at the selected quality when stream copying is not possible.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Lower is better quality and a bigger file. Ignored when streams can be copied.
How to use this tool
For an MKV with subtitles or multiple audio tracks, test whether required tracks remain in the MP4 result.
Results and examples
Open the MP4 on the intended device and check subtitles, audio selection, and playback length.
Worked example
For a bilingual MKV lecture, verify the required audio and subtitles in the MP4 instead of checking playback alone.
Limitations
- Streams are copied when possible; incompatible input can fall back to H.264/AAC encoding.
- The interface does not select or guarantee preservation of every subtitle, audio track, or MKV attachment.
Fields
| Field | Guidance and constraints |
|---|---|
| Quality if re-encoding is needed | Lower is better quality and a bigger file. Ignored when streams can be copied. · Accepted range: 18–32 · Input step: 1 |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Will every subtitle and language track survive?
That is not guaranteed; verify the required language and subtitles in the destination player.
Can the quality setting be ignored?
Yes. Successful stream copy does not re-encode the video.
Related tools
You do not need to start over. Continue with the tool that fits your next step.
