Open .mkv files online

To open a .mkv file in your browser, press Open editor on the video editor, then bring your file into the project from inside the editor. On 2026-10-14 we opened a 6-second 1280 x 720 test .mkv (H.264 video with AAC sound) on anyedit.app and it showed in the source monitor with the right picture and a 6-second length. We cut the clip to 3 seconds in a new sequence and exported it with the default H.264 MP4 setting. The exported .mp4 was a valid file with H.264 video and AAC sound, 3 seconds long. Two things to know: the editor only reads Matroska, so it cannot save a .mkv (export gives MP4 or MOV), and our test browser cannot fill the system file picker, so we loaded the file by dropping it onto the editor window; we have not checked the Import button by hand. Nothing is uploaded and there is no sign-up.

Open editor About the video editor

Best on a desktop browser. This editor has desktop menus and shortcuts.

Can I open it?

tested 2026-10-14 · engine 0.7.2 · chromium 152 desktop · anyedit.app

.mkv compatibility
Check	Result	Notes
Listed by the engine	Listed in docs	Matroska and WebM are listed as decode only, so the editor reads them but does not write them. MP4 and MOV are listed for both import and export, along with H.264 and AAC (HEVC is decode only).
Opened a .mkv file	Works	A 6-second 1280 x 720 .mkv (Matroska, H.264 and AAC, made with ffmpeg) was added to the project. The Info panel read it as a movie with H.264 video, AAC audio and a 6-second length, and the source monitor showed the test pattern with the timecode running to 6:00.
Edited it	Works	We made a new sequence from the clip and cut it at 3 seconds, removing the second half. The sequence became 3:00 long.
Exported as H.264 MP4	Works	Export with the default H.264 setting gave an .mp4 file (2.2 MB). ffprobe read it as MP4 with H.264 1280 x 720 video at 30 fps and AAC audio, 3.0 seconds long. A frame at 1 second matched the source frame; colors differ slightly because the export carries a color tag the source did not have.
Saved as .mkv	Not supported	There is no .mkv output. The editor reads Matroska only; export gives MP4 or MOV.
Import button with a file chooser	Not tested yet	In our automated browser the Import button opened a file picker we could not fill, so we added the file by dropping it into the editor. Not checked by hand.
Exported as MOV or ProRes	Not tested yet	Not tested for this format.
Phone screen (390 px wide)	Not tested yet	Not tested for this format.

The video editor with a test .mkv open: the source monitor and program monitor show a color-bar test pattern, and the timeline holds the clip anyedit-sample.mkv

Our test file open in the video editor on anyedit.app, 2026-10-14

FAQ

Do I need VLC or another player to open a MKV file?

Not to look at it and cut it. The video editor opens .mkv files in your browser and shows them in its source monitor. We opened and edited a test .mkv there on 2026-10-14.

How do I open a MKV file in the browser?

Press Open editor on the video editor, then drag your .mkv file onto the editor window, or add it from the Import page. We loaded our test file by dropping it onto the editor; we have not checked the Import page file picker by hand.

Can I save my edit back to .mkv?

No. The editor reads Matroska but cannot write it. Export gives MP4 or MOV; in our test the default H.264 MP4 was valid, with H.264 video and AAC sound.

Will every MKV file open?

Not necessarily. Our test file used H.264 and AAC. Matroska is only a container, so a file with a codec the editor does not list may not play. We have not tested other codecs.

Is my MKV file uploaded?

No. It is read by code running in your browser.

Related formats

.mov