QT to WebM (VP9) - Online Video Converter
Convert QT to WebM (VP9) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About QT to WebM (VP9)
Convert QT to WebM. QT is the original QuickTime extension behind Apple's MOV container. WebM pairs VP9 video with Opus audio and supports an alpha channel. Apple editors accept it unevenly; keep MP4 for editing round-trips..
Why convert QT to WebM (VP9)?
- Smaller files with WebM lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
QT vs WebM (VP9)
| Animation | Yes | Yes |
|---|---|---|
| Transparency | Yes | Yes |
| Compression | lossy | lossy |
| Typical use | QT is the original QuickTime extension behind Apple's MOV container. | WebM pairs VP9 video with Opus audio and supports an alpha channel. |
When not to convert QT to WebM (VP9)
- Skip WebM for archival masters: lossy compression discards detail, so keep the QT original.
- Keep a master copy: repeated exports stack small losses, so archive QT before batch WebM shares.
Limits
Starting point: QT - QT is the original QuickTime extension behind Apple's MOV container. Same container as MOV under the older extension name. Apple editors accept it unevenly; keep MP4 for editing round-trips. Encode WebM (VP9 / Opus) from QT at a bitrate near the source, and confirm the audio track before converting.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.