Free · Private · No upload
Adjust PDF colors online
Improve PDF readability by adjusting brightness, contrast and saturation locally in your browser.
Correct PDF brightness and contrast in three steps
Docs Bunny processes PDF pages locally to adjust brightness, boost contrast, and fix faded scans without cloud uploads.
- Add your PDF
Select the document or scan you want to enhance.
- Adjust brightness and contrast
Use presets like Enhance scan or High contrast, or fine-tune sliders.
- Download enhanced PDF
Export a clear, legible PDF with corrected colors and contrast.
Common questions
Can this fix faint or dark scanned documents?
Yes. The Enhance scan and High contrast presets brighten dark backgrounds and darken faint text.
Is my PDF uploaded anywhere?
No. Page rendering and color correction execute completely inside your browser.