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H.264 to FLV - Online Video Converter
Convert H.264 to FLV online. Private, client-side - no upload required. Batch conversion, quality presets, codec control.
Convert H.264 to FLV
Drop H.264 video here or click to select
H.264, MP4
FLV (Sorenson Spark / MP3)
About H.264 to FLV
Convert H.264 to FLV. H.264 is the AVC codec behind most MP4 and broadcast video. 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 H.264 to FLV?
- Smaller files with FLV lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
H.264 vs FLV
| Animation | Yes | Yes |
|---|---|---|
| Transparency | No | No |
| Compression | lossy | lossy |
| Typical use | H.264 is the AVC codec behind most MP4 and broadcast video. | FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. |
When not to convert H.264 to FLV
- Skip FLV for archival masters: lossy compression discards detail, so keep the H.264 original.
- Keep a master copy: repeated exports stack small losses, so archive H.264 before batch FLV shares.
Limits
Starting point: H.264 - H.264 is the AVC codec behind most MP4 and broadcast video. Annex-B headers usually import cleanly into MP4. Flash-era players are gone, so convert for current browsers. Encode FLV (Sorenson Spark / MP3) from H.264 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.
Related conversions
FAQ
How do I convert H.264 to FLV?
Drop your H.264 file onto this page, choose quality and codec settings, then click Convert. The result downloads as FLV instantly. All processing runs in your browser.
What codec is used for FLV?
The default codec for FLV is Sorenson Spark / MP3. You can change the video and audio codec in Advanced mode.
How do you store my files?
We do not store any processed videos. All conversion happens entirely in your browser using FFmpeg WASM.