Why VisionKit Makes a Difference

Taking a standard photo of a piece of paper often produces curved lines, uneven shadows, angled perspectives, and oversized image files. Apple's VisionKit framework solves these issues through real-time computer vision:

  • Real-Time Edge Detection: Automatically identifies the four corners of a page on a desk.
  • Perspective Correction: Straightens angled shots so the document appears flat and square.
  • Automatic Shutter: Snaps each page automatically as soon as it detects stable framing.
  • Document Filters: Cleans up shadows and boosts text contrast so small fonts stay legible.

Step-by-Step: Scanning Documents with img2pdf

  1. Open img2pdf and tap Scan on the home grid.
  2. Place your document on a flat surface with contrasting background (such as a dark desk for white paper).
  3. Hold your iPhone over the page. The scanner will highlight the page in blue and automatically take the scan. Continue to turn pages for multi-page documents.
  4. When finished, tap Save in the bottom right corner of the scanner.
  5. Inspect & Organize: In img2pdf, your scanned pages appear in a clean grid. Drag thumbnails to reorder pages if needed.
  6. Edit & Enhance: Tap any page to open the editor. Adjust crop handles, rotate orientation, or choose a visual look such as B&W or Color Document.
  7. Export: Tap Save PDF. Select your preferred layout (US Letter or A4) and preset (Small, Standard, or Best) to create a clean, shareable PDF.

Scanning Both Sides of an ID Card: Tap Add > ID card scan to capture the front and back of a driver's license or identification card into a single aligned page.

Built-in Redaction for Sensitive Paperwork

When scanning tax forms, mortgage applications, or medical receipts, you often need to share the document while protecting specific sensitive numbers. In img2pdf:

  1. Tap the page thumbnail in the grid.
  2. Tap More in the bottom bar and select Redact.
  3. Draw a black privacy block directly over Social Security numbers, bank account figures, or private phone numbers.
  4. The opaque redaction is permanently embedded into the output PDF during export, preventing anyone from inspecting the underlying text or image data.

Best Practices for Clean Document Scans

  • Good Lighting: Diffuse overhead light prevents harsh shadows across the text. Avoid standing directly between the light source and the document.
  • Contrasting Surface: Scanning white sheets against a dark desk or table helps the edge detection locate boundaries instantly.
  • Choose the Right Preset: For text documents and forms, the Small preset (150 DPI B&W) delivers ultra-sharp text at a fraction of the file size, making it effortless to email or upload to government and school portals.