FLV to SWF - Online Video Converter
Convert FLV to SWF online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About FLV to SWF
Convert FLV to SWF. FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. SWF is Adobe's interactive Flash format mixing vector animation with video. Only the embedded video track converts; scripts and buttons are dropped..
Why convert FLV to SWF?
- Smaller files with SWF lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
FLV vs SWF
| 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. | SWF is Adobe's interactive Flash format mixing vector animation with video. |
When not to convert FLV to SWF
- Skip SWF 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 SWF 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. Only the embedded video track converts; scripts and buttons are dropped. Encode SWF (Sorenson Spark / MP3) 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.