QT to F4V - Online Video Converter
Convert QT to F4V online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About QT to F4V
Convert QT to F4V. QT is the original QuickTime extension behind Apple's MOV container. F4V is Flash's MP4-based successor limited to H.264 video and AAC audio. Seek indexes can be sparse, so verify duration after conversion..
Why convert QT to F4V?
- Smaller files with F4V lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
QT vs F4V
| Animation | Yes | Yes |
|---|---|---|
| Transparency | Yes | No |
| Compression | lossy | lossy |
| Typical use | QT is the original QuickTime extension behind Apple's MOV container. | F4V is Flash's MP4-based successor limited to H.264 video and AAC audio. |
When not to convert QT to F4V
- Skip F4V for archival masters: lossy compression discards detail, so keep the QT original.
- Flatten transparency first: F4V 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. Seek indexes can be sparse, so verify duration after conversion. Encode F4V (H.264 / AAC) 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.