How to Scan Paper to PDF: Digitize Documents with Your Phone or Scanner

Quick answer

To scan paper to PDF, use your phone's built-in scanner (iOS Notes app or Android Google Drive) or a dedicated scanner app. Place the document on a flat surface, capture it with your camera, and save as PDF. For best results, use good lighting, keep the document flat, and scan at 300 DPI or higher.

Why scan to PDF?

Digitizing paper documents provides numerous benefits:

1. Searchability — Find documents instantly with text search (with OCR)
2. Accessibility — Access documents from anywhere, anytime
3. Backup — Protect against loss, damage, or theft
4. Sharing — Email or share documents instantly
5. Organization — Tag, categorize, and file documents digitally
6. Space savings — Eliminate physical filing cabinets
7. Compliance — Meet legal and regulatory retention requirements

Method 1: Scan with iPhone (iOS)

Using the Notes app

Step 1: Open the Notes app

Step 2: Create a new note or open an existing one

Step 3: Tap the camera icon above the keyboard

Step 4: Select "Scan Documents"

Step 5: Position your phone over the document

Step 6: The app automatically detects edges and captures

Step 7: Adjust the crop if needed

Step 8: Tap "Keep Scan" and scan additional pages

Step 9: Tap "Save" — the scan is saved as a PDF in the note

Step 10: Share via email, AirDrop, or save to Files

Using the Files app

Step 1: Open the Files app

Step 2: Navigate to where you want to save

Step 3: Tap the three dots menu > "Scan Documents"

Step 4: Follow the same scanning process

Step 5: The PDF is saved directly to your chosen location

Method 2: Scan with Android

Using Google Drive

Step 1: Open Google Drive app

Step 2: Tap the "+" button

Step 3: Select "Scan"

Step 4: Position your phone over the document

Step 5: Tap the shutter button (or let auto-capture work)

Step 6: Adjust crop and rotation

Step 7: Tap "Done" to save as PDF in Google Drive

Using Google Lens

Step 1: Open Google Lens (or Google app > Lens icon)

Step 2: Point camera at document

Step 3: Tap the document icon to scan

Step 4: Save as PDF

Method 3: Dedicated scanner apps

Recommended apps

• Adobe Scan — Free, excellent OCR, auto-crop
• Microsoft Lens — Free, Office integration, good OCR
• CamScanner — Popular, cloud sync, watermark on free tier
• Scanbot — Clean interface, barcode scanning
• Genius Scan — Simple, reliable, no watermark

General process

1. Download and install the app
2. Open the app and grant camera permission
3. Position document in frame
4. Capture (manual or auto)
5. Review and adjust crop
6. Apply filters (color, grayscale, B&W)
7. Save as PDF
8. Share or upload to cloud

Method 4: Desktop scanner

Using a flatbed scanner

Step 1: Place document face-down on scanner glass

Step 2: Open scanner software (Windows Fax and Scan, Image Capture on Mac, or manufacturer software)

Step 3: Select scan settings:

• Resolution: 300 DPI (minimum for text)
• Color mode: Color, grayscale, or B&W
• Format: PDF

Step 4: Click "Scan"

Step 5: Save the PDF

Using a document feeder (ADF)

Step 1: Load documents into the feeder

Step 2: Select "Scan to PDF" in scanner software

Step 3: Configure settings (DPI, color mode)

Step 4: Start scan — pages feed automatically

Step 5: Review and save

Tips for high-quality scans

Lighting

• Use bright, even lighting
• Avoid shadows across the document
• Natural light is best; avoid direct sunlight
• Use a desk lamp if needed

Positioning

• Place document on a flat, dark surface (contrasts with white paper)
• Keep phone parallel to document
• Fill the frame with the document
• Remove any objects from the background

Document preparation

• Remove staples, paper clips, and sticky notes
• Flatten creased or folded pages
• Clean the scanner glass (for desktop scanners)
• Use a dark background mat for phone scanning

Resolution settings

File size management

• Scanned PDFs can be large (especially at high DPI)
• Use MintSaaS PDF Compressor to reduce size
• Consider grayscale for text-only documents (smaller files)
• Remove blank pages after scanning

OCR: Making scanned PDFs searchable

Scanned PDFs are images — you can't search the text. To make them searchable:

1. Use an app with built-in OCR (Adobe Scan, Microsoft Lens)
2. Apply OCR after scanning using online tools
3. Use desktop OCR software (ABBYY FineReader, Adobe Acrobat Pro)

With OCR, the scanned image gets a hidden text layer, making every word searchable and copyable.

FAQ

Q: Can I scan multiple pages into one PDF?

A: Yes. Most scanning apps and desktop scanners support multi-page scanning. Each page becomes a separate page in the PDF.

Q: What's the best DPI for scanning documents?

A: 300 DPI is the standard for text documents. Use 600 DPI for photos or archival documents.

Q: Can I scan in color or should I use grayscale?

A: Use color for documents with images or colored text. Use grayscale or B&W for text-only documents (smaller file size).

Q: How do I reduce the size of a scanned PDF?

A: Use MintSaaS PDF Compressor to reduce file size while maintaining readability.

Q: Is my data safe during scanning?

A: Yes. MintSaaS processes files securely and deletes them after processing. Learn more about PDF security.

Related reading

• What is OCR and Why Your Business Needs It
• How to Compress PDF Files Online
• How to Repair a Corrupted PDF File
• PDF/A Compliance: Create Archival PDFs

Free tools on MintSaaS

• PDF Compressor
• Image Compressor
• Image Converter
• MintSaaS Home
• MintSaaS Blog

Sources

1. Apple. "Scan documents with iPhone." Apple Support, 2025.
2. Google. "Scan documents with Google Drive." Google Help, 2025.
3. Adobe. "Scan documents to PDF." Adobe Help Center, 2025.