Is this tool really offline?

Yes. All processing happens locally in your browser. Your files never leave your device.

Yes, completely free with no registration required.

Absolutely. No files are uploaded to any server. Everything stays on your device.

MOV to WebM Offline Converter

MOV is Apple\'s QuickTime container, not always natively supported on Windows or Android browsers. WebM works everywhere on the web.

Convert MOV (QuickTime) videos to WebM format completely offline in your browser

No Upload 100% Private Free

You might also need:

This tool uses FFmpeg.wasm. The first run downloads the engine (~25MB) — cached after.

Initializing processor...

or click to select

WebM streams in any modern browser without plugins or extensions.

VP9 typically produces 30-50% smaller files than H.264.

No upload required. Conversion happens in your browser.

MOV is Apple's QuickTime container, not always natively supported on Windows or Android browsers. WebM works everywhere on the web.

No. Processing is entirely client-side via FFmpeg.wasm — files never leave your browser.

Limited by your device's RAM. ~2GB on desktop, smaller on mobile. Browser memory is the constraint.