Convert MP4 to WebM

Transform your universal video format for web and devices into WebM format. Free, private, and browser-based.

How it works

  1. Upload MP4 Files — Drag and drop your MP4 files into the converter, or click to browse. Common sources: smartphones, screen recordings.
  2. Convert to WebM — The converter processes your files to WebM format entirely in your browser. No files are uploaded to any server — your privacy is guaranteed.
  3. Download Results — Download your converted WebM files instantly. For multiple files, download individually or as a ZIP archive.

Why convert MP4 to WEBM

  • Add transparency support — WebM supports alpha channels for graphic design
  • Leverage WebM advantages: royalty-free and open source
  • Overcome MP4 limitations: lossy compression — some quality loss
  • Upload to websites and platforms that require or prefer WebM format

FAQ

Is MP4 to WebM conversion free?
Yes, Fileza.io converts MP4 to WebM completely free with no limits on file size or number of conversions. No hidden fees, no watermarks, and no account required.

Will I lose quality converting MP4 to WebM?
Both MP4 and WebM use lossy compression. Output quality is excellent at high quality settings (85%+) — most people cannot see any difference.

Is it safe to convert MP4 to WebM online?
Absolutely. Unlike most online converters, Fileza.io processes your files entirely in your browser using WebAssembly. Your MP4 files are never uploaded to any server — the conversion runs on your own device, keeping your files 100% private.

Can I convert multiple MP4 files to WebM at once?
Yes, Fileza.io supports batch conversion. Drag and drop multiple MP4 files at once and they will all be converted to WebM simultaneously. Download them individually or as a ZIP archive.

Does MP4 to WebM conversion work on mobile?
Yes, the converter works on any device with a modern web browser — iPhones, iPads, Android phones, and tablets. No app installation required.

Will the converted WebM files be smaller or larger than MP4?
WebM files are generally smaller than MP4 files. The exact reduction depends on your quality settings and the content of your files.

How long does MP4 to WebM conversion take?
Most conversions complete in seconds. The exact time depends on file size and your device performance. Since processing happens locally in your browser, faster devices convert more quickly. Video files may take longer due to re-encoding.