PDF Brightness & Contrast
Fix faded or dark scans in one pass.
Adjust the brightness and contrast of every page in a PDF. Perfect for rescuing faded scans, dark photos and low-quality copies before printing or archiving.
Your files are processed locally in your browser. Nothing is uploaded to a server, ever.
Tip
Drop your file here or click to browse. Everything is processed on this device — nothing is uploaded.
Quick answers
- What does this tool do?
- Fix faded or dark scans in one pass. Adjust the brightness and contrast of every page in a PDF. Perfect for rescuing faded scans, dark photos and low-quality copies before printing or archiving..
- Is it free?
- Yes — free and unlimited, with no account required and no watermark on the result.
- What files are supported?
- PDF files, up to 100 MB each.
- Where is my file processed?
- Entirely in your browser. Your file never leaves your device — nothing is uploaded to a server.
- What are the limitations?
- Pages are re-rendered as images, so text becomes non-selectable; extremes can wash out or crush details.
- What happens if processing fails?
- You get a clear message explaining what went wrong and how to fix it (try another file, check the format, or start over). Your original file is never touched.
How to PDF Brightness & Contrast
- Open the tool.
- Add your PDF.
- Move the brightness and contrast sliders.
- Start conversion.
- Download the adjusted PDF.
Frequently asked questions
Common problems and fixes
- The compressed file is barely smaller
Why: the PDF is mostly text and vectors, which are already stored efficiently — the real weight is in images and scans.
Fix: choose the maximum (rasterize) mode for image-heavy files; text-only documents shrink the least by nature.
- Text looks blurry after compression
Why: rasterizing converts pages to images at the chosen resolution, so very low quality/DPI settings soften small text.
Fix: use Standard mode to keep text sharp and selectable, or raise the quality and DPI sliders and accept a larger file.
- A large file processes slowly
Why: files up to 100 MB are processed on your device, so your own CPU and memory do the work.
Fix: close heavy tabs, keep this tab in the foreground — or split the PDF first and compress the parts.
Who uses PDF Brightness & Contrast?
- People emailing documents — attachment limits on mail servers (commonly 10–25 MB) bounce anything bigger.
- Applicants and students — portals for jobs, tenders and university forms enforce strict upload size caps.
- Archivists of their own scans — keeping years of scanned paperwork at a fraction of the disk space.