Enhance PDF Online
Use PDF Magic to enhance PDF documents online and improve the visual quality of scanned pages. This free PDF enhancement tool lets you adjust brightness, contrast, sharpness, noise reduction and black-and-white threshold before creating an improved PDF.
Why enhance a scanned PDF?
Scanned PDF files can contain faded text, uneven lighting, background noise, weak contrast or blurry edges. A PDF quality enhancer can make pages easier to read, print and archive by improving the visual appearance of the scan.
Common uses for PDF enhancement
An online PDF enhancer is useful for scanned notes, old documents, receipts, forms, worksheets, photocopies, contracts and educational material. It can help prepare pages for printing, sharing or later OCR processing.
How to enhance a PDF online
Upload the scanned or image-based PDF document.
Review the original and enhanced page previews.
Adjust brightness, contrast, sharpness, noise and threshold settings.
Process the document and download the enhanced PDF.
Brightness and contrast
Brightness changes the overall lightness of the page, while contrast increases the difference between dark and light areas. Small adjustments usually produce the most natural result.
Sharpness and noise reduction
Sharpness can improve the definition of text edges, while noise reduction helps remove isolated marks and scan grain. Strong settings may also remove fine details.
Black-and-white threshold
Threshold settings can turn gray areas into stronger black or white regions. This is useful for text-heavy documents, but photographs and shaded graphics may lose detail.
Enhancement limitations
Enhancement cannot fully restore missing details from very blurred, damaged or low-resolution scans. OCR and specialist restoration may still be required for difficult documents.
Working with PDF files online
PDF Magic provides browser-based free PDF tools. Review the current privacy policy before processing confidential or sensitive documents.
Frequently asked questions
Can this improve faded scanned text?
Yes. Brightness, contrast and threshold adjustments may make faded text easier to read.
Should I enable preserve colors?
Enable it when the document contains important colored highlights, images or annotations.
Can enhancement repair a blurry scan?
It may improve edge definition, but it cannot recreate details that are missing from the original scan.
Will the final PDF keep selectable text?
Image-based processing may rasterize the pages, so original selectable text may not remain selectable.