WebM to FLV - Online Video Converter
Convert WebM to FLV online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About WebM to FLV
Convert WebM to FLV. WebM pairs VP9 video with Opus audio and supports an alpha channel. FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. Flash-era players are gone, so convert for current browsers..
Why convert WebM to FLV?
- Smaller files with FLV lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
WebM vs FLV
| Animation | Yes | Yes |
|---|---|---|
| Transparency | Yes | No |
| Compression | lossy | lossy |
| Typical use | WebM pairs VP9 video with Opus audio and supports an alpha channel. | FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. |
When not to convert WebM to FLV
- Skip FLV for archival masters: lossy compression discards detail, so keep the WebM original.
- Flatten transparency first: FLV has no alpha channel, so composite WebM over a background color.
Limits
Starting point: WebM - VP9 video with Opus audio and alpha support. Apple editors accept it unevenly; keep MP4 for editing round-trips. Flash-era players are gone, so convert for current browsers. Encode FLV (Sorenson Spark / MP3) from WebM 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.