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AV1 to MP4 (H.264) Converter (Free, Online, No Upload)

Convert any AV1 video to MP4 with H.264 encoding right in your browser. Nothing gets uploaded to a server. While AV1 has great compression, H.264 MP4 plays on virtually every device and browser in existence. The conversion runs locally 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 libx264 -crf 23 -c:a aac -movflags +faststart {out_video}",
  "input_files": {
    "in_video": "https://example.com/input.mkv"
  },
  "output_files": {
    "out_video": "output.mp4"
  }
}'

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

Common Variations

High quality output
-i input.mkv -c:v libx264 -crf 18 -preset slow -c:a aac -b:a 192k output.mp4
From WebM AV1 source
-i input.webm -c:v libx264 -crf 23 -c:a aac -movflags +faststart output.mp4
H.265 output instead
-i input.mkv -c:v libx265 -crf 28 -c:a aac -movflags +faststart output.mp4

Related Operations

Free MP4 to AV1 Converter Online | RenderIOFree H.265 to H.264 Converter Online | RenderIOFree VP9 to MP4 Converter Online | RenderIOFree MKV to MP4 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