MKV to MP4 (H.265) - Online Video Converter
Convert MKV to MP4 (H.265) online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
About MKV to MP4 (H.265)
Convert MKV to MP4 (H.265). MKV is an open container holding multiple video, audio, and subtitle tracks. 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 MKV 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.
MKV vs MP4 (H.265)
| Animation | Yes | Yes |
|---|---|---|
| Transparency | Yes | No |
| Compression | lossy | lossy |
| Typical use | MKV is an open container holding multiple video, audio, and subtitle tracks. | MP4 (H.265) stores HEVC video, cutting bitrate roughly in half versus H.264. |
When not to convert MKV to MP4 (H.265)
- Skip MP4 (H.265) for archival masters: lossy compression discards detail, so keep the MKV original.
- Flatten transparency first: MP4 (H.265) has no alpha channel, so composite MKV over a background color.
Limits
Starting point: MKV - Multi-track container for video, audio, subtitles. Only the selected tracks carry over, so pick audio and subtitles first. HEVC decoding needs newer hardware and encodes more slowly. Encode MP4 (H.265) (H.265 / AAC) from MKV 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.