Should I choose enhanced grayscale or adaptive black and white?
Use enhanced grayscale for photos, stamps, pencil, or faint lines. Try adaptive black and white for text, receipts, and monochrome tables.
Processed locally · No upload
Clean Scanned PDF Pages
Whiten gray paper, improve text contrast, and reduce mild noise and edge shadows. Choose enhanced grayscale or local adaptive black and white, preview, then rebuild every page.
Click to choose PDFs or drag them here
PDF only · One file at a time
Files stay on your device and are never uploaded.
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How it works
- 1Choose a scanned PDFThe file opens only in your current browser.
- 2Adjust and previewUse the first page to check faint text, stamps, and thin lines.
- 3Clean every pageRebuild and download a new PDF with the same settings.
Preview before processing the full document
Scan quality varies, so no setting fits every file. Adaptive black and white can remove gray backgrounds strongly, but is more likely to lose pencil, colored stamps, or fine notation. Enhanced grayscale is more conservative. Review every downloaded page.
Frequently asked questions
Does it recognize text automatically?
No. Cleanup changes page pixels only and does not run OCR, so scanned text in the output is not searchable or selectable.
Can shadow removal erase content?
It corrects slow local lighting changes, but aggressive contrast, whitening, or thresholding can still lose faint marks. Preview first and review every output page.
Why are page count and page size limited?
Scanned pages require large browser canvases. Sequential processing and hard limits protect mobile tabs; split longer documents first.
Is my PDF uploaded to a server?
No. Previewing, pixel cleanup, and PDF rebuilding all happen in your browser.