FLV to MP4 (H.265) - Online Video Converter
Convert FLV to MP4 (H.265) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About FLV to MP4 (H.265)
Convert FLV to MP4 (H.265). FLV is Adobe's Flash-video container carrying Sorenson Spark or H.264 streams. MP4 (H.265) stores HEVC video, cutting bitrate roughly in half versus H.264. HEVC decoding needs newer hardware and encodes more slowly..
Why convert FLV to MP4 (H.265)?
- Smaller files with MP4 (H.265) lossy compression.
- Keep animation and transparency where supported.
- Private, no upload - runs in your browser.
FLV vs MP4 (H.265)
| 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. | MP4 (H.265) stores HEVC video, cutting bitrate roughly in half versus H.264. |
When not to convert FLV to MP4 (H.265)
- Skip MP4 (H.265) 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 MP4 (H.265) 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. HEVC decoding needs newer hardware and encodes more slowly. Encode MP4 (H.265) (H.265 / AAC) 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.