Pad Video via API

Add padding around video to change the aspect ratio without cropping or stretching. Create letterboxed or pillarboxed output with custom border colors.

Try it in your browser

Loading FFmpeg engine... (~31 MB)

Use the API

curl -X POST https://renderio.dev/v1/commands \
  -H "X-API-KEY: ffsk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
  "ffmpeg_command": "-i {in_video} -vf \"pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black\" {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

Pad to 9:16 portrait (white)

-i input.mp4 -vf "pad=ih*9/16:ih:(ow-iw)/2:0:white" output.mp4

Pad to square (1:1)

-i input.mp4 -vf "pad=max(iw\,ih):max(iw\,ih):(ow-iw)/2:(oh-ih)/2:black" output.mp4

Blurred background padding

-i input.mp4 -filter_complex "[0]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,boxblur=20[bg];[0]scale=1080:1920:force_original_aspect_ratio=decrease[fg];[bg][fg]overlay=(W-w)/2:(H-h)/2" output.mp4

Related Operations

Resize Video via API | RenderIO Crop Video via API | RenderIO

Need to process at scale?

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

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