Ajuster les couleurs

Fine-Tune Your PDF’s Appearance

Adjust Colors gives you four controls: brightness (-100 to +100), contrast (-100 to +100), gamma correction (0.1 to 5.0), and a sepia tone toggle. Move the sliders, see the result in real time on your actual pages, then apply when it looks right.

The tool renders each page to canvas, applies the adjustments pixel by pixel, and rebuilds the PDF at 2x resolution. Everything happens in your browser — your file never leaves your device.

When to Adjust PDF Colors

Color adjustments fix problems and improve readability. Different situations call for different settings.

What Each Slider Does

Brightness shifts all pixels lighter or darker. Contrast increases or decreases the difference between light and dark areas. Gamma correction adjusts midtone brightness without blowing out highlights or crushing shadows — useful for scanned documents where the overall lightness is off but the extremes are fine.

Sepia applies a warm brownish tone across the entire document. All four adjustments stack: you can boost contrast, darken slightly, and apply sepia in one pass. A reset button returns everything to defaults.

How It Compares

PDF color adjustment tools are uncommon. Most require image editing software and a round-trip through export/reimport.

Nothing Leaves Your Machine

Color adjustments run entirely in your browser. Pages are rendered, processed, and rebuilt locally. The adjusted PDF downloads straight to your machine.