Open .webm files online
To open a .webm file in your browser, press Open editor on the video editor, then bring your file into the project from inside the editor. WebM is read-only here: the editor decodes VP8, VP9 and Opus, but it cannot save a .webm, so you export an MP4 instead. On 2026-10-16 we opened two test files on anyedit.app. One was a 6-second 1280 x 720 .webm (VP9 video, Opus sound) that we made with ffmpeg. The other was a 14-second 1920 x 1080 VP8 clip with no sound from Wikimedia Commons (CC0). Both showed in the source monitor with the right picture and length. We cut the first one to 3 seconds and exported it with the default H.264 MP4 setting. The exported .mp4 was a valid file, 3 seconds long, and a frame from it matched the source. Two things to know: the Export tab has no WebM or VP9 option, and our test browser cannot fill the system file picker, so we loaded the files by dropping them onto the editor and have not checked the Import button by hand. Nothing is uploaded and there is no sign-up.
Best on a desktop browser. This editor has desktop menus and shortcuts.
Can I open it?
| Check | Result | Notes |
|---|---|---|
| Listed by the engine | Listed in docs | WebM and Matroska are listed as decode only, with VP8, VP9, AV1 and Opus video and audio. Export is H.264 in MP4 or MOV, ProRes, DNxHR and a few other formats, not WebM. |
| Opened a .webm file | Works | A 6-second 1280 x 720 .webm (VP9 and Opus, made with ffmpeg) was added to the project. The Info panel read it as a movie at 30 fps, 1280 x 720, VP9 video, 48000 Hz 1 channel Opus audio, 6 seconds long, and the source monitor showed the test pattern with the timecode running to 6:00. |
| Opened a .webm from another source | Works | A clip from Wikimedia Commons (CC0, VP8 video, 1920 x 1080, 29.97 fps, about 14 seconds, no audio track, 6 MB) opened the same way. The Info panel read VP8 at 1920 x 1080 and the source monitor showed the footage. |
| Edited it | Works | We made a new sequence from the VP9 clip, cut it at 3 seconds with Ctrl+K and deleted the second half. The sequence became 3:00 long. |
| Exported as H.264 MP4 | Works | Export with the default settings (Format H.264, Multiplexer MP4) downloaded an .mp4 file (about 2 MB). ffprobe read it as MP4 with H.264 1280 x 720 video at 30 fps, 90 frames, and AAC audio at 48 kHz stereo, 3.0 seconds long. A frame at 1 second showed the same picture and timecode as the source; the greens look a little duller because the export carries a color tag the source did not have. |
| Saved back as .webm | Partial | Not possible. The Format list on the Export tab offers H.264, ProRes, DNxHR, APV and QuickTime Motion JPEG, with H.265 and AV1 greyed out. There is no WebM, VP8 or VP9 option, so a .webm has to leave as .mp4 or another format. |
| 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 files by dropping them into the editor. Not checked by hand. |
| Sound playback, AV1 or transparent WebM | Not tested yet | Not tested for this format. |
| Phone screen (390 px wide) | Not tested yet | Not tested for this format. |
Our test file open in the video editor on anyedit.app, 2026-10-16