PDF Document Scanner
Free, private document scanner running directly in your browser. Scan paper documents, receipts, whiteboards, and notes with auto edge detection, perspective warping, and document enhancement filters.
Live Camera Scanner
Scan physical documents in real time
Upload photos or document images
Select multiple images or drag photos here to convert into a multi-page PDF.
Private Client-Side Document Scanner
Photographing physical paperwork, receipts, contracts, or whiteboard notes with a phone or webcam often produces skewed angles, uneven lighting, and gray paper backgrounds. PDF Document Scanner turns your desktop or mobile browser into a local document scanning studio where you can capture live camera frames or batch-upload existing photos, straighten perspective distortion using interactive 4-point corner handles, and apply contrast-enhancing document filters.
Each acquired page initializes with a 5% inset crop frame and four draggable corner markers (TL, TR, BR, BL). As you position the corners along the physical edges of your page, the engine performs a 16x16 piecewise bilinear subdivision warp on an HTML5 canvas to rectify angled captures into flat, rectangular sheets. You can then switch between Magic Color (which applies a contrast stretch and brightens light paper regions), B&W Document (which applies luminance binarization at a 140 threshold), Smooth Grayscale, or Original color, and rotate individual sheets in 90-degree increments.
Every camera snapshot, perspective transformation, pixel filter pass, and multi-page PDF assembly executes locally in your browser memory without uploading images to external servers. When your pages are ready, you can set a custom document title, choose between Standard A4 pages (595.28 x 841.89 pt with 20 pt margins) or Fit Document dimensions, and export a clean multi-page PDF without watermarks or account sign-ups.
Core Tool Capabilities
- Live Camera & Batch Photo Upload: Capture 1080p snapshots directly from your device camera with front/rear camera switching, or drag and drop multiple JPG, PNG, and WebP photos at once.
- 4-Point Bilinear Perspective Warp: Drag the TL, TR, BR, and BL corner handles over skewed document edges to flatten angled captures using a 16x16 subdivided canvas mesh.
- Magic Color & B&W Document Filters: Enhance readability with Magic Color (contrast stretch and paper whitening), B&W Document (luminance thresholding), Smooth Grayscale, or Original color.
- Multi-Page Capture Strip: Build multi-page documents in sequence, switch between captured sheets in the Pages sidebar, rotate individual pages by 90 degrees, or delete unwanted takes.
- Standard A4 or Fit-to-Image Layout: Compile processed scans onto centered Standard A4 pages (595.28 x 841.89 pt with 20 pt margins) or size each PDF page to match the exact cropped image dimensions.
- Custom Filename & PDF Title Metadata: Edit the Document Title directly in the workspace header to set both the internal PDF Title metadata property and the downloaded .pdf filename.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Expense Receipts & Tax Vouchers
- • Signed Contracts & Physical Forms
- • Handwritten Notes & Whiteboards
- • Identity Documents & Certificates
Technical Specifications & Platform Limits
Supports 1920x1080 ideal camera streams and browser-decodable image uploads.
Interactive corner handles (TL, TR, BR, BL) with 90-degree page rotation.
Local canvas pixel processing exported at 92% JPEG quality per page.
Multi-page PDF with custom title metadata and local client-side execution.
Captures, warps, and compiles PDFs in local browser memory with no file upload required.
Step-by-Step Workflow
Capture Camera Snapshots or Upload Photos
Click Open Camera to take live snapshots (using Capture Page and Done / Close Camera), or click Browse Images to upload existing document photos.
Position the 4 Corner Handles
Select a page from the Pages strip, drag the TL, TR, BR, and BL handles in the Adjust Document Corners panel to match your document borders, and click Rotate if needed.
Select a Document Filter & Page Format
Choose Magic Color, B&W Document, Grayscale, or Original under Document Filter, and select either Standard A4 or Fit Document under Page Format.
Compile & Download Scanned PDF
Optionally customize the Document Title in the top bar, click Generate Scanned PDF to assemble all pages, and click Download PDF to save your file.
Practical Real-World Use Cases
Expense Receipts & Tax Vouchers
Straighten curled or angled photos of paper receipts and apply Magic Color to whiten the background for accounting and expense reimbursement.
Signed Contracts & Physical Forms
Capture multi-page ink-signed agreements with your device camera and compile them into a standardized A4 PDF ready for filing or email delivery.
Handwritten Notes & Whiteboards
Rectify angled photos of lecture notes, notebook pages, or meeting whiteboards and boost text contrast with the B&W Document or Magic Color filter.
Identity Documents & Certificates
Digitize passports, licenses, diplomas, and official records locally in your browser without uploading sensitive personal images to remote servers.
Frequently Asked Questions
- How does the 4-point perspective correction work?
- Each page displays four draggable corner handles (TL, TR, BR, BL) initialized at a 5% inset rectangle. When you move any handle, the engine calculates the target width and height from the opposite edge lengths and renders a 16x16 bilinearly interpolated grid onto a local canvas to flatten the quadrilateral into a rectangle.
- Are my camera snapshots or uploaded photos sent to a server?
- No. Camera streams are captured onto a local HTML5 canvas and uploaded images are read via the browser FileReader API. All perspective warping, pixel filtering, and PDF compilation happen locally in your browser memory.
- What is the difference between Magic Color and B&W Document?
- Magic Color is applied by default and keeps color intact while applying a 1.35x contrast stretch and brightening light pixels (above RGB 200) to whiten paper backgrounds. B&W Document converts each pixel to luminance and applies a hard threshold at 140 to produce pure black text on a pure white background.
- Should I choose Standard A4 or Fit Document?
- Choose Standard A4 when you plan to print the PDF or submit formal paperwork, as it places each scan onto a fixed 595.28 x 841.89 pt A4 page with a 20 pt margin. Choose Fit Document for receipts, index cards, or wide whiteboards where you want each PDF page sized to the exact dimensions of the cropped image.
- Can I scan multiple pages and customize the output filename?
- Yes. You can add more pages at any time using the Add Page camera button or Upload button in the header, switch between pages or delete unwanted captures in the Pages sidebar, and click the Document Title field (defaulting to Scanned_Document) to set the output PDF filename.
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