Clean Scanned PDF

Automatically deskew, denoise, and enhance scanned PDF documents. Straighten crooked pages, remove scanner speckle, and improve contrast for better readability and OCR accuracy.

Clean Scanned PDF is available with a subscription

Start a 7-day free trial to unlock Clean Scanned PDF and every tool included with your plan.

Start 7-day Free Trial

100% Private

Instant Processing

Browser-Based

Features

Automatic deskew to straighten crooked scans

Denoise to remove scanner speckle and artifacts

CLAHE contrast enhancement for uneven lighting

4 presets: General, Document, Handwritten, Receipt

Processes all pages in multi-page PDFs

Preserves original page dimensions

No AI credits required

Files encrypted during transfer, auto-deleted after processing

How It Looks

Noisy Scan

Cleaned PDF

How It Works

Upload your scanned PDF document

Choose a preset that matches your document type

Click Clean PDF to process all pages

Preview the cleaned result and download your enhanced PDF

Common Use Cases

Cleaning up poorly scanned documents before archiving

Preparing scanned PDFs for OCR text extraction

Improving readability of faded receipts and thermal prints

Straightening pages scanned at an angle

Enhancing handwritten notes for easier reading

Reducing file noise from mobile phone document captures

Frequently Asked Questions

What does Clean Scanned PDF do?

It applies computer vision processing to every page of your scanned PDF. The pipeline includes deskewing (straightening crooked pages), denoising (removing speckle and artifacts), contrast enhancement (normalizing uneven lighting), and optional adaptive thresholding for crisp black-and-white output.

Which preset should I use?

Use Default for general scanned documents. Use Document to preserve grayscale detail (photos, charts). Use Handwritten for handwritten notes with stronger denoising. Use Receipt for faded thermal prints with extra contrast boost.

Does this use AI credits?

No. Clean Scanned PDF uses computer vision processing, not AI. It does not consume any AI credits.

Will it change the text content?

No. This tool only enhances the visual quality of scanned page images. It does not modify, add, or remove any text. For adding searchable text, use the Make Searchable tool.

How many pages can I process?

You can process PDFs with up to 50 pages per file. Each page is rendered, enhanced, and reassembled into a new PDF.

Can I use this before OCR?

Yes. Cleaning scanned documents before OCR significantly improves text recognition accuracy. Deskewing and denoising help OCR engines read text more reliably.

Is my file processed securely?

Your files are processed securely by the PDFSub Engine - an isolated server with no internet access. Files are encrypted during transfer and auto-deleted after processing.

Related PDF Tools

More tools you might find useful in the same workflow.

Compress PDF →

Reduce PDF file size

Make Searchable →

Add searchable text layer to scanned PDFs

Photo to Document →

Convert phone photos to clean PDF documents

Auto-Crop PDF →

Detect content boundaries and remove scanner borders

Repair PDF →

Fix corrupted or malformed PDFs

Edit Metadata →

Edit PDF title, author, and keywords

Browse all PDF tools →