Free tools › Audio and video

MP4 to WebM

The royalty-free web format: smaller than H.264 at the same look, for sites that want it.

This one runs on your credits. The royalty-free web format: smaller than H.264 at the same look, for sites that want it.

Sign in and get 500 free credits every month — enough for many files — then drop the file in the workbench and run mp4 to webm there.

Pick a file below to see exactly what it would cost.

More free conversions, where you upload. The Fylane extension does the same work inside any upload form, on its own free share every day.Add to Chrome

How to convert MP4 to WebM

Drop the video.
Nothing to choose.
Press Convert and download the WEBM.

What happens to your file

The video is re-encoded as VP9 with Opus sound in a WebM container — what Chrome, Firefox, Edge and Safari play natively and what web publishers use beside an MP4 fallback.

VP9 encodes slower than H.264: expect a few times the wait of an MP4 conversion for the same clip.

Questions

When do I want WebM instead of MP4?

For a website: it is smaller at the same look and needs no licence. For a phone, an editor or a message, keep MP4.

Do it once, not on every form

Fixing a file here means downloading it and going back to the form. The Fylane extension does this work inside the form instead, on the file you already have.

And it keeps the result. The next application that asks for a résumé, a cover letter and a photo fills all three from one tap, each one refitted to what that site accepts.

Your files stay in the browser, encrypted, on your machine. Nothing is uploaded to keep them and nothing is sent anywhere to fill a form.

Filmed from the extension: three upload fields on a job application, filled from one tap.

Add to Chrome — free What it does

Do this in code

curl -X POST https://api.fylane.dev/v1/jobs \
  -H "Authorization: Bearer $FYLANE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "file_id": "<file id>",
    "operation": "video.convert",
    "options": {
      "container": "webm"
    }
  }'

The same operation, video.convert — Anything playable becomes H.264+AAC in a faststart MP4 — or, by `container`, MOV, MKV, VP9+Opus WebM, or Xvid+MP3 AVI for old players. Plus the small edits: mute, rotate, flip, speed (the sound keeps its pitch), reverse (60 s at most), loop. Upload first with the quickstart; every option is on the operations page. 500 free credits a month, then $5 per thousand.