Document Scanner

About Document Scanner

Last updated: June 2026

OptiPix Document Scanner turns your laptop or phone camera into a private document scanner. Capture or upload a photo of a document, ID, receipt, or whiteboard - auto-detect the four corners, correct perspective with a real homography transform, then enhance with adaptive binarization (B&W scan), grayscale, color, or high-contrast modes. Add multiple pages and download as a single multi-page PDF, individual PNG/JPEG files, or a ZIP. The output is a perfectly straight, rectangular document image - exactly like CamScanner or Adobe Scan, but everything runs in your browser. No camera-roll permissions, no app, no upload. Manually drag the four corners if auto-detection isn't perfect. Perfect for scanning contracts, IDs, receipts, handwritten notes, and book pages - privately.

How It Works

Edge detection finds dominant lines and the largest quadrilateral contour. The four corners feed a 3×3 homography (DLT) that maps the source quad to a true rectangle. Adaptive binarization (Sauvola/Otsu) produces clean B&W scans. Multi-page PDFs are assembled with pdf-lib.

Use Cases

• •Scan a contract on the kitchen table without uploading it
• •Digitize receipts for expense tracking
• •Scan a handwritten notebook page to PDF
• •Capture an ID card without granting CamScanner access to your camera roll
• •Photograph a whiteboard and turn it into a clean rectangular scan

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If you find Document Scanner useful, check out these related tools: OCR Text Extractor, Image to PDF, and EXIF Remover. All tools run entirely in your browser with no uploads or signups required.