256 Tools

Bulk Convert WEBM to MP4

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

WebM 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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Some links are affiliate links.

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Related tools

MP4 → WEBMConvert MP4 video to WEBM in your browser — no upload, free.MP4 → MP3Convert MP4 video to MP3 in your browser — no upload, free.MP4 → WAVConvert MP4 video to WAV in your browser — no upload, free.MP4 → GIFConvert MP4 video to GIF in your browser — no upload, free.

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

WEBM → MP4 — Your file never leaves your device — no server uploadWEBMFileBrowserffmpeg (local)MP4OutputYour file never leaves your device — no server upload

Batch conversion, ZIP download and quality control

  • Convert many files at once — drop or pick several WebM 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 MP4 files smaller. The setting applies to every file in the batch.

How to convert WEBM to MP4

  1. 1Drop your WebM 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 MP4" and wait a moment.
  4. 4Download the MP4 file — it is saved straight to your device.

Common uses

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

Quality & compatibility notes

  • Both WebM and MP4 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 WebM file uploaded when I convert it to MP4?＋
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 WEBM to MP4?＋
Both WebM and MP4 are lossy formats, so re-encoding may slightly reduce quality.
Can I convert several WebM files to MP4 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 MP4 back to WebM?＋
Yes — we have a MP4 to WebM 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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