MP4 to MP4 (H.265) - Online Video Converter
Convert MP4 to MP4 (H.265) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About MP4 to MP4 (H.265)
MP4 with H.264 video and AAC audio plays on virtually every phone and browser. The H.265 target re-encodes the picture with HEVC, cutting bitrate roughly in half at similar detail. Encoding runs slower and needs newer hardware to decode smoothly, so confirm playback on the target device. Audio re-encodes to AAC unless the track is copied. Subtitle and extra tracks need selection first, since only chosen streams carry over to the new container.
Why convert MP4 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.
MP4 vs MP4 (H.265)
| Animation | Yes | Yes |
|---|---|---|
| Transparency | No | No |
| Compression | lossy | lossy |
| Typical use | MP4 pairs H.264 video with AAC audio in the ISO base media container. | MP4 (H.265) stores HEVC video, cutting bitrate roughly in half versus H.264. |
When not to convert MP4 to MP4 (H.265)
- Skip MP4 (H.265) for archival masters: lossy compression discards detail, so keep the MP4 original.
- Keep a master copy: repeated exports stack small losses, so archive MP4 before batch MP4 (H.265) shares.
Limits
Starting point: MP4 - H.264 video with AAC audio in one file. H.264 has no alpha channel, so transparency is dropped. HEVC decoding needs newer hardware and encodes more slowly. Encode MP4 (H.265) (H.265 / AAC) from MP4 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.