Adjust Colors
A full color grading toolkit for PDFs. Adjust eight independent parameters -- brightness, contrast, saturation, hue shift, temperature, tint, gamma, and sepia -- with a live preview that updates as you move each slider.
How It Works
- Upload your PDF file.
- The editor opens showing a preview of the first page and a color settings panel.
- Move the sliders to adjust each color parameter. The preview updates in real time.
- Click Reset to restore all sliders to their default positions.
- Click Apply to process all pages and download the adjusted PDF.
Options
- Brightness -- Lighten or darken the entire page (-100 to +100).
- Contrast -- Increase or decrease the difference between light and dark areas (-100 to +100).
- Saturation -- Boost or reduce color intensity (-100 to +100). Setting to -100 produces a grayscale result.
- Hue Shift -- Rotate the color wheel to shift all colors uniformly.
- Temperature -- Shift colors warmer (yellow/orange) or cooler (blue).
- Tint -- Add a green or magenta cast.
- Gamma -- Adjust midtone brightness using a gamma curve. Values below 1.0 darken midtones; values above 1.0 lighten them.
- Sepia -- Apply a classic sepia tone effect. Higher values produce a stronger brown tint.
Features
- Eight independently adjustable color parameters
- Live preview that responds immediately to slider changes
- Reset button to quickly return to defaults
- Processes all pages in the document
- Works with any PDF content (text, images, graphics)
Use Cases
- Brightening a dark scan or correcting overexposed pages
- Desaturating a colorful document to reduce ink usage before printing
- Applying a sepia tone to create an antique look for certificates or awards
- Correcting color temperature on photos embedded in a PDF
- Boosting contrast on faded or low-quality scanned documents
Tips
- For a quick grayscale conversion, drag the saturation slider all the way to -100.
- The gamma slider is particularly useful for improving readability of scanned documents where midtones are too dark or too light.
- Like the other image-effect tools, this rasterizes each page. The output will be image-based, so text will not be selectable.