CamMaster online document scanner with AI edge detection and auto-crop

📁

Drop documents here or click to upload

Supports JPG, PNG, WEBP, PDF — multiple files at once

🔒 All processing is local — files never leave your device

📋 Quick Tips

For best results, place document on a contrasting background
Good lighting reduces shadows — try near a window
Upload multiple images to create a multi-page PDF
Use Magic Pro filter to remove shadows from scanned docs

Drag the 4 corner handles individually, or the edge handles to move an entire edge

Original

Processed

📄 Document Pages

Drag to reorder pages · Click to edit filter · Hover to delete

Ready to export — 0 pages

📄 Export as PDF

Page Size

Orientation

Quality

🖼️ Export as Images

Single page → JPG download
Multiple pages → ZIP archive

CamMaster by PDFdukan is a free online document scanner that uses OpenCV.js computer vision to automatically detect document edges in your photos. Upload any image taken with your phone or camera — CamMaster identifies the four corners of your document and applies perspective correction so the output looks like it was photographed straight on, perfectly flat. Choose from nine scan filters including Magic Pro (shadow removal), Black & White (crisp text), and Auto-Enhance (general improvement). Combine multiple scanned pages into a single multi-page PDF. Supports batch import of multiple images and full PDF rendering. All processing runs entirely in your browser — your documents never leave your device, keeping every file completely private and secure.

Frequently Asked Questions

How accurate is the automatic edge detection?

CamMaster's AI edge detection (powered by OpenCV.js Canny edge detection and contour analysis) accurately finds document corners in over 95% of photos with reasonable contrast between the document and background. For best results, place documents on a dark, non-reflective surface with good, even lighting. Manual corner adjustment is always available if auto-detection misses.

Can I scan multiple pages into one PDF?

Yes. After processing your first image through the crop and filter steps, you arrive at the Pages view. Click "Add More" to upload additional images or PDF pages. All pages appear as thumbnails you can drag to reorder. Export all pages as a single multi-page PDF or as individual JPG files in a ZIP archive.

What is the Magic Pro filter?

Magic Pro is CamMaster's most powerful scan enhancement filter. It applies deep shadow removal using local contrast normalization, aggressive sharpening, and adaptive thresholding to produce crisp, print-quality document scans from phone photos. It's especially effective for documents photographed in low light or with shadows from the photographer's hand.

Does CamMaster work on mobile phones?

Yes — CamMaster is fully mobile-optimized. On smartphones, you can upload images directly from your camera roll or take a new photo. The interface adapts to touch controls with larger crop handles and buttons. The entire scanning and export workflow works in mobile browsers without any app installation required.