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Adjust Colors

Fine-tune brightness, contrast, saturation and more in your PDF.

Click to select a file or drag and drop

A single PDF file

Your files never leave your device.

About Adjust Colors

Adjust Colors improves the legibility of washed-out or dark scans with brightness, contrast and saturation controls.

How to use it

  1. Select your PDF, or drag it onto the drop area.
  2. Move the sliders while watching the preview.
  3. Apply and download.

Your file stays on your device

This tool runs entirely in your browser. Your file is read from your device, processed in memory, and saved back to your device — it is never uploaded to QPDF or anyone else. Once this page has loaded, the tool also works with your internet connection switched off.

How QPDF keeps files private →

Good to know

  • Adjustments render pages as images, so text may no longer be selectable.

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Compress PDF Reduce PDF file size while keeping text sharp and searchable.