FLV to ASF - Online Video Converter
Convert FLV to ASF online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About FLV to ASF
Convert FLV to ASF. FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. ASF is Microsoft's streaming container that usually wraps WMV and WMA. Live-archive headers can confuse players; remuxing usually repairs them..
Why convert FLV to ASF?
- Smaller files with ASF lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
FLV vs ASF
| Animation | Yes | Yes |
|---|---|---|
| Transparency | No | No |
| Compression | lossy | lossy |
| Typical use | FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. | ASF is Microsoft's streaming container that usually wraps WMV and WMA. |
When not to convert FLV to ASF
- Skip ASF for archival masters: lossy compression discards detail, so keep the FLV original.
- Keep a master copy: repeated exports stack small losses, so archive FLV before batch ASF shares.
Limits
Starting point: FLV - FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. Flash-era players are gone, so convert for current browsers. Live-archive headers can confuse players; remuxing usually repairs them. Encode ASF (WMV2 / WMA) from FLV 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.