QT to ASF - Online Video Converter
Convert QT to ASF online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About QT to ASF
Convert QT to ASF. QT is the original QuickTime extension behind Apple's MOV container. ASF is Microsoft's streaming container that usually wraps WMV and WMA. Live-archive headers can confuse players; remuxing usually repairs them..
Why convert QT to ASF?
- Smaller files with ASF lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
QT vs ASF
| Animation | Yes | Yes |
|---|---|---|
| Transparency | Yes | No |
| Compression | lossy | lossy |
| Typical use | QT is the original QuickTime extension behind Apple's MOV container. | ASF is Microsoft's streaming container that usually wraps WMV and WMA. |
When not to convert QT to ASF
- Skip ASF for archival masters: lossy compression discards detail, so keep the QT original.
- Flatten transparency first: ASF has no alpha channel, so composite QT over a background color.
Limits
Starting point: QT - QT is the original QuickTime extension behind Apple's MOV container. Same container as MOV under the older extension name. Live-archive headers can confuse players; remuxing usually repairs them. Encode ASF (WMV2 / WMA) 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.