MKV to MP4 Converter
Turn MKV videos into MP4 files that play on phones, TVs, editors and web forms, usually in seconds and without re-encoding.
- No upload
- No file size cap
- No credits or watermark
- Batch convert
Drop files here to convert to MP4
MKV, WebM and other videos. Files are converted on this device and never leave it.
What is an MKV to MP4 converter?
MKV (Matroska) is a flexible video container used by screen recorders like OBS, downloaded films and many cameras. MP4 is the container almost every device and app supports. An MKV usually already contains H.264 or HEVC video and AAC audio, which can be copied into an MP4 container without re-encoding. That remux is fast and lossless. When the MKV uses codecs MP4 players cannot handle, such as VP9 or Vorbis, this converter re-encodes to H.264 and AAC using your device’s hardware.
How to use MKV to MP4 Converter
- Choose Open File or drop your MKV files.
- Check the detected codecs. H.264 shows “copied without re-encoding”.
- Keep Auto mode, or choose Always H.264 for maximum compatibility. Optionally limit the resolution or trim.
- Select Convert to MP4 and download the result or a ZIP.
Why convert MKV to MP4 here
- No upload, no size capLarge MKV recordings are read straight from your disk and converted on your device. Nothing is queued on a server or counted against a quota.
- Lossless remuxCompatible streams are copied, so the picture is identical and a 2-hour file converts in about a minute.
- OBS recordings ready to editTurn OBS MKV recordings into MP4 for Premiere, DaVinci Resolve, CapCut or YouTube.
- Batch convert with ZIPAdd several files, convert them in one go with the same settings and download a single ZIP.
When you need MKV as MP4
- OBS screen recordings. OBS records to MKV by default; editors and uploads prefer MP4.
- Phones and TVs. Many smart TVs and iPhones do not play MKV.
- Video editors. iMovie and some versions of Premiere reject MKV.
- Uploads. Social networks and forms that only accept MP4.
MKV vs MP4
- Both are containers: the video inside can be the same H.264 or HEVC stream.
- MP4 has wider device support; MKV supports more audio and subtitle tracks.
- Only the first video and audio track are kept in the MP4. Subtitle tracks are not copied.
- VP9/AV1 video and Vorbis/Opus audio are converted to H.264/AAC for MP4 compatibility.
Local conversion vs upload-based converters
| Feature | Digital ToolPad | Typical upload converter |
|---|---|---|
| Where the file is converted | On your device, in the browser | On the service’s servers after upload |
| File size | No cap set by us; limited by your device | Free plans are often capped (commonly around 1 GB or less) |
| Daily limits | None | Some services ration free conversions or use credits |
| Account or watermark | Never | Varies; some require sign-up for large files |
| MOV to MP4 without re-encoding | Automatic for H.264 videos | Varies |
| Works offline after loading | Yes, for the fast engine | No |
Upload services are useful when a device is too slow or a format is very unusual. For everyday conversions, keeping the file local is faster to start and keeps private recordings private. Looking for more? See all video and audio tools, convert screen recordings with WebM to MP4, or split a photo for Instagram with the grid maker.
Example: an OBS recording
A 1-hour 1080p OBS recording (3.2 GB MKV, H.264 + AAC) is remuxed to MP4 in under a minute, with exactly the same quality and size.
What to expect from the result
Only the primary video and audio tracks are converted; additional audio languages, subtitles and chapters are dropped. Re-encoding speed depends on your device. Unusual codecs use the FFmpeg fallback (about 32 MB, downloaded once).
MKV to MP4 Converter questions
How do I convert MKV to MP4 without losing quality?
Keep Auto or Keep original codec. If the MKV contains H.264 or HEVC, the streams are copied into MP4 without re-encoding, so quality is identical.
Is this MKV to MP4 converter free and private?
Yes. It is free, with no account, watermark, daily credit or conversion count. Your file is opened by your browser and converted on your device; it is not sent to a conversion server. Closing the tab discards the working copy. Downloaded results stay on your device.
Why is MKV to MP4 so fast here?
When the video codec is already MP4-compatible, only the container is rewritten. No frames are re-encoded.
Are subtitles kept?
No. MP4 has limited subtitle support, so subtitle tracks are not copied. Extract them separately if you need them.
Is there a file size limit?
We do not set one. The fast engine reads your file in small pieces, so multi-gigabyte videos work on most desktops. The practical limit is your device memory. In Chrome and Edge you can save a single large MP4 directly to disk while it converts. The FFmpeg fallback, used only for unusual codecs, works best below about 2 GB.