I use this among other sites for quick online conversion.
If you have the links to your webm files that are saved online, you can convert them via link. You can also upload/link to one file after another to be processed instead of fully converting a single file one at a time.
You can convert files:
- From your Computer
- By URL
- From Google Drive
- From Dropbox
- From OneDrive
It also has a lot of editing options you can perform on the file as it converts it; trimming, audio and video bit rate, volume, fps, quality presets, resolution, aspect ratio, etc.
You can also do the same things on this other online converter and it functions nearly identical to the above linked site with converting in bulk and altering the files during conversion:
(post is archived)