256 Tools

Bulk Convert MP4 to WEBM

Drag & drop your MP4 file here, or click to choose

MP4 files only

You can drop or select several files at once.

Your file is never uploaded — everything runs in your browser.

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MP4 (the most compatible video format) and WebM (a light, royalty-free web video format). This free tool converts MP4 to WEBM directly in your browser, so your file never leaves your device. No install and no sign-up needed.

MP4 → WEBM — Your file never leaves your device — no server uploadMP4FileBrowserffmpeg (local)WEBMOutputYour file never leaves your device — no server upload

Batch conversion, ZIP download and quality control

  • Convert many files at once — drop or pick several MP4 files and they are converted one after another.
  • When you convert two or more files, the results are bundled into a single ZIP so you download everything in one click.
  • Adjust quality and size: lower the quality or resize to make the WebM files smaller. The setting applies to every file in the batch.

How to convert MP4 to WEBM

  1. 1Drop your MP4 file onto the box above, or click to choose it.
  2. 2Adjust the options if you like (resolution, bitrate or frame rate — for GIF, the fps and width).
  3. 3Click "Convert to WebM" and wait a moment.
  4. 4Download the WebM file — it is saved straight to your device.

Common uses

  • Make a MP4 clip play everywhere by converting it to WEBM.
  • Meet a social upload requirement, extract the audio or make a short GIF.
  • Reduce file size while keeping a WEBM version that plays smoothly.

Quality & compatibility notes

  • Both MP4 and WebM are lossy formats, so re-encoding may slightly reduce quality.
  • Re-encoding video can take a while and runs entirely in your browser.
  • Everything runs in your browser — your file is never uploaded.

Frequently asked questions

Is my MP4 file uploaded when I convert it to WebM?＋
No. The conversion runs entirely in your browser using your device, so your file is never sent to any server.
Will the quality drop when I convert MP4 to WEBM?＋
Both MP4 and WebM are lossy formats, so re-encoding may slightly reduce quality.
Can I convert several MP4 files to WebM at once?＋
Yes. Add multiple files and they are converted one by one in your browser. A single file downloads directly; two or more are packed into one ZIP. If one file fails, the others still convert.
Is it free? Do I need to sign up?＋
Yes, it is completely free — no sign-up, no install and no watermark.
Is there a file size limit?＋
You can convert files up to 200 MB. Everything is processed on your device, so very large files depend on your available memory.
Can I convert the other way, from WebM back to MP4?＋
Yes — we have a WebM to MP4 converter too. Use the related links on this page.

Private by design

Everything runs in your browser — your file is never uploaded.

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