Powered by WebAssembly

H.264 to H.265 (HEVC) Converter (Free, Online, No Upload)

Re-encode H.264 video to H.265 (HEVC) right in your browser. Nothing gets uploaded to a server. HEVC delivers the same visual quality at roughly half the file size, saving bandwidth and storage. The conversion runs locally using FFmpeg compiled for your browser, so your files stay on your device.

Try it in your browser

Loading FFmpeg engine... (~31 MB)

Use the API

curl -X POST https://renderio.dev/api/v1/run-ffmpeg-command \
  -H "X-API-KEY: ffsk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
  "ffmpeg_command": "-i {in_video} -c:v libx265 -crf 28 -preset medium -c:a copy {out_video}",
  "input_files": {
    "in_video": "https://example.com/input.mp4"
  },
  "output_files": {
    "out_video": "output.mp4"
  }
}'

Need an API key? Get your free API key to start processing files programmatically.

Common Variations

High quality (CRF 23)
-i input.mp4 -c:v libx265 -crf 23 -preset slow -c:a copy output.mp4
Fast encode for batch processing
-i input.mp4 -c:v libx265 -crf 28 -preset fast -c:a copy output.mp4
10-bit color depth
-i input.mp4 -c:v libx265 -crf 28 -pix_fmt yuv420p10le -c:a copy output.mp4
With HDR tone mapping
-i input.mp4 -c:v libx265 -crf 28 -x265-params hdr-opt=1 -c:a copy output.mp4

Related Operations

Free H.265 to H.264 Converter Online | RenderIOCompress Video Online Free, No Upload Required | RenderIOFree MP4 to AV1 Converter Online | RenderIOFree MP4 to WebM Converter Online | RenderIO

Need to process at scale?

Automate this with the RenderIO FFmpeg API. Process thousands of files programmatically or through no-code video automation.

Get your API key