H.264 to MP4 (H.265) - Online Video Converter
Convert H.264 to MP4 (H.265) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About H.264 to MP4 (H.265)
Convert H.264 to MP4 (H.265). H.264 is the AVC codec behind most MP4 and broadcast video. 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 H.264 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.
H.264 vs MP4 (H.265)
| Animation | Yes | Yes |
|---|---|---|
| Transparency | No | No |
| Compression | lossy | lossy |
| Typical use | H.264 is the AVC codec behind most MP4 and broadcast video. | MP4 (H.265) stores HEVC video, cutting bitrate roughly in half versus H.264. |
When not to convert H.264 to MP4 (H.265)
- Skip MP4 (H.265) 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 MP4 (H.265) 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. HEVC decoding needs newer hardware and encodes more slowly. Encode MP4 (H.265) (H.265 / AAC) 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.