Home › Video converter › MP4 converter
MP4 to MKV Converter
Convert MP4 files to MKV in seconds, free and unlimited.
🔒 Files are processed on your device. Nothing is uploaded.
How to convert MP4 to MKV
- Click Choose files or drop your MP4 files into the box. You can add several at once.
- Make sure MKV is selected as the output format.
- Press Convert, then download your MKV files.
MP4
MPEG-4 video, the most widely supported video format on phones, browsers and TVs.
MKV
Matroska container that can hold almost any codec, many audio tracks and subtitles.
Video and audio are converted with FFmpeg running inside your browser. Short clips finish in seconds; long or high-resolution videos can take a few minutes because your own device does the work. Open Options to trim, resize or change quality.
Other MP4 conversions
- MP4 to WEBM
- MP4 to MOV
- MP4 to AVI
- MP4 to FLV
- MP4 to WMV
- MP4 to MPEG
- MP4 to 3GP
- MP4 to OGV
- MP4 to M4V
- MP4 to TS
- MP4 to GIF
- MP4 to MP3
- MP4 to WAV
- MP4 to OGG
- MP4 to OPUS
- MP4 to FLAC
- MP4 to AAC
- MP4 to M4A
- MP4 to M4R
- MP4 to WMA
- MP4 to AC3
- MP4 to AIFF
Convert other files to MKV
- GIF to MKV
- WEBM to MKV
- MOV to MKV
- AVI to MKV
- FLV to MKV
- WMV to MKV
- MPEG to MKV
- MPG to MKV
- M4V to MKV
- 3GP to MKV
- 3GPP to MKV
- 3G2 to MKV
- OGV to MKV
- TS to MKV
- MTS to MKV
- M2TS to MKV
- VOB to MKV
- MXF to MKV
- DV to MKV
- MOD to MKV
- RM to MKV
- RMVB to MKV
FAQ
Is converting MP4 to MKV free?
Yes. Unlimited conversions, no sign-up, no watermark.
Are my files uploaded to a server?
No. FieldConvert processes files inside your browser, so your MP4 files never leave your device. That makes it private and fast, because there is no upload or download wait.
Is there a file size limit?
Only your device's memory. Files up to about 2 GB work in most desktop browsers.