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VP9 to MP4 (H.264) Converter (Free, Online, No Upload)

Convert any VP9-encoded WebM file to MP4 with H.264 right in your browser. Nothing gets uploaded to a server. This is useful when you need a VP9 video to play on devices or platforms that don't support WebM. 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.webm"
  },
  "output_files": {
    "out_video": "output.mp4"
  }
}'

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

Common Variations

High quality preserve
-i input.webm -c:v libx264 -crf 18 -preset slow -c:a aac -b:a 192k output.mp4
Fast encode
-i input.webm -c:v libx264 -preset fast -crf 25 -c:a aac output.mp4
Scale to 1080p
-i input.webm -vf "scale=1920:-2" -c:v libx264 -crf 23 -c:a aac output.mp4

Related Operations

Free MP4 to VP9 WebM Converter Online | RenderIOWebM to MP4 Converter Online Free, No Upload | RenderIOFree AV1 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