devtools
🔒 Local processing
Local developer utility

Image Resizer

Resize local images to chosen dimensions and download the results. Your input stays in your browser while you work.

Image Resizer (Batch)🔒 Processed locally
Files stay on this device.

Fit preserves proportions; crop fills the frame; letterbox adds a background. Quality affects JPEG, WebP and AVIF. PNG is lossless.

Used for letterboxing and JPEG transparency.
Tokens: {name}, {w}, {h}, {n}, {format}. The extension is added automatically.

How to use Image Resizer (Batch)

Choose one or more local files above, enter any requested options, then run the action. The generated file appears with its own download control.

Processing runs locally in this browser. No input is uploaded or sent to a conversion service.

Fit preserves proportions; crop fills the frame; letterbox adds a background. Quality affects JPEG, WebP and AVIF. PNG is lossless.

Inputs

  • Size preset
  • Resize mode
  • Width (px)
  • Height (px)
  • Scale (%)
  • Allow enlarging smaller images
  • Output format
  • Quality (%)
  • Background color: Used for letterboxing and JPEG transparency.
  • Filename pattern: Tokens: {name}, {w}, {h}, {n}, {format}. The extension is added automatically.
  • Choose local files using the file picker.