Convert MKV to MP4 from the right-click menu
Select an MKV video, hold Shift, right-click and pick Video, then MP4. Flecto saves an MP4 beside the original that plays on TVs, phones and in editing programs. Nothing is uploaded.
Free to try. 10 conversions a week, no account needed.
How to convert MKV to MP4 with Flecto
- Select your videoClick the MKV file in File Explorer. Select several to convert them together.
- Hold Shift and right-clickFlecto opens a dial of categories beside your cursor. Choose Video.
- Pick MP4WEBM and GIF are offered too, and the Audio category extracts the sound as MP3 or another audio format.
- Find the MP4 next to the originalThe new file is saved beside the original, which stays untouched.
Good to know
- If everything inside the MKV is MP4-compatible (H.264 video and AAC audio), Flecto repackages it without re-encoding and keeps every track. That takes seconds and loses no quality.
- Otherwise Flecto re-encodes to H.264 and AAC, using your graphics card when it can. A re-encoded MP4 keeps the first video track and the first audio track. Extra audio tracks and subtitles are not carried over.
- MKV files often carry subtitle formats that MP4 cannot hold. Such a file is re-encoded, and its subtitles are left out.
- Audio and video conversions use FFmpeg. Flecto offers to download it once, and after that it works offline.
- The free plan includes 10 conversions every week. Failed or cancelled files do not count.
Why MKV files refuse to play
MKV (Matroska) is a flexible container that can hold almost any video, several audio languages and many subtitle tracks in one file. That flexibility is why it is popular for films, and also why many TVs, phones, game consoles and editing programs will not open it.
MP4 is stricter and far more widely supported. Converting keeps the picture and the main sound and gives you a file that simply plays. Keep the MKV if you may want the other audio tracks or subtitles later.
Questions
Can I keep the subtitles?
Only when the whole file can be repackaged without re-encoding. Otherwise the MP4 has the first video and audio track and no subtitles, so keep the original MKV.
Which audio track ends up in the MP4?
All of them when the file is repackaged. When it is re-encoded, the first audio track.
Will the MP4 be bigger or smaller?
About the same size when repackaged. A re-encoded file can be smaller or larger than the original, depending on how the MKV was made.
Is my file uploaded?
No. The conversion runs on your PC, and the file never leaves it.
Can I convert several files at once?
Yes. Select them together, then use the same Shift and right-click menu. The dial offers the formats they can all use.
More guides
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Convert your next file in two clicks. Free to try. 10 conversions a week, no account needed.
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