Adjust Colors/Contrast
Modify contrast, brightness, and saturation
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Color Adjustments
Got a PDF that's too dark, washed out, or has color issues? iReadPDF's color adjustment tool lets you fine-tune brightness, contrast, saturation, and color balance to get perfect results. Whether you're fixing a bad scan or preparing documents for print, you have full control.
No design software needed—adjust colors right in your browser with real-time preview. From simple brightness fixes to advanced color correction, make your PDFs look their best.
Why Use Our Adjust PDF Colors?
Who Uses This Tool?
Trusted by professionals across industries for their daily document needs
Fix Dark Scans
Brighten dark or underexposed scanned documents. Improve readability of faded originals.
Print Preparation
Adjust colors for optimal print results. Convert to CMYK-friendly colors and adjust for paper type.
Photo Enhancement
Enhance photos embedded in PDFs. Adjust contrast and saturation for better visual impact.
Accessibility
Increase contrast for better readability. Help visually impaired users with high-contrast versions.
Archive Restoration
Restore faded historical documents. Bring old scans back to legible condition.
Presentation Polish
Enhance colors in presentation PDFs. Make charts and graphics more vibrant and clear.
How It Works
Get started in three simple steps
Upload PDF
Upload the PDF that needs color adjustment.
Adjust Settings
Use sliders to adjust brightness, contrast, saturation, and color balance. Preview changes in real-time.
Apply & Download
Apply to selected pages or entire document. Download your color-corrected PDF.
Powerful Features
Everything you need, nothing you don't
Brightness
Lighten dark documents or reduce glare.
Contrast
Enhance text visibility and image clarity.
Saturation
Adjust color intensity from grayscale to vivid.
Color Balance
Correct color casts and tints.
Auto-Enhance
One-click automatic optimization.
Page Selection
Apply to specific pages or all pages.
Frequently Asked Questions
Quick answers to common questions
Will this affect text quality?
Color adjustments apply to the entire page including text. For text-heavy documents, contrast enhancement often improves readability.
Can I adjust individual images?
Adjustments apply to full pages. For image-specific edits, consider extracting images first, editing, then reinserting.
What is auto-enhance?
Auto-enhance analyzes your PDF and automatically optimizes brightness, contrast, and color balance for best results.
Can I convert to grayscale?
Yes, reduce saturation to zero for grayscale conversion. Great for reducing print costs.
Will this increase file size?
Color adjustments may slightly affect file size depending on the changes. Significant increases are rare.
Can I undo changes?
Your original file is never modified. The tool creates a new adjusted copy, so you always have the original.
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