Scan to PDF: Best Apps and Settings for High-Quality Documents
Scanning documents to PDF is a common task—whether archiving receipts, sharing contracts, or preserving photos. This guide lists the best apps for scanning to PDF and the optimal settings to get sharp, readable, and reasonably sized files.
Best apps by platform
| Platform | App | Why it’s good |
|---|---|---|
| iOS | Apple Notes | Built-in, fast, good automatic cropping and perspective correction |
| iOS | Scanner Pro (Readdle) | Advanced enhancement, OCR, cloud export options |
| Android | Google Drive | Built-in for many devices, simple PDF creation and upload |
| Android | Microsoft Lens | Excellent edge detection, integrated Office exports |
| Windows | NAPS2 | Free, open-source, batch scanning and PDF output |
| macOS | Preview | Built-in, reliable multi-page PDFs from scanner or camera |
| Cross-platform | Adobe Scan | Strong OCR, auto-enhance and cloud sync |
| Cross-platform | CamScanner | Powerful features, but review privacy settings before use |
Recommended scan settings for high-quality PDFs
- Resolution (DPI): 300 dpi for text documents; 300–600 dpi for detailed images or photos.
- Color mode: Black & White or Grayscale for text-only documents to reduce file size; Color for photos or color charts.
- File format: Save as PDF for documents you’ll share or archive. For images you’ll edit, also keep a high-quality JPEG/PNG.
- Compression: Use lossy compression for photos to save space, lossless or minimal compression for important scans to preserve clarity.
- Page size and margins: Scan at original paper size (A4/Letter). Use auto-crop and deskew features to remove background and straighten pages.
- OCR: Enable OCR when you need searchable or editable text. Proofread OCR results for accuracy, especially with non-standard fonts or poor originals.
- Multi-page documents: Combine scans into a single PDF and add bookmarks or a table of contents for long documents.
Capture tips for best results
- Lighting: Use even, diffuse light to avoid shadows and glare. If using a flatbed scanner, close the lid.
- Flatness: Flatten pages—use a weight or hold corners down for bound books.
- Contrast: Increase contrast slightly in settings if the original is faint.
- Alignment: Align camera or document parallel to avoid perspective distortion; use auto-crop/perspective correction if available.
- Clean glass/lens: Wipe scanner bed or smartphone lens before scanning.
Workflow examples
| Goal | App & Settings | Steps |
|---|---|---|
| Archive contracts | Scanner Pro or NAPS2 — 300 dpi, Grayscale, OCR on | Scan both sides, combine into single PDF, OCR, add descriptive filename and metadata, upload to cloud. |
| Share photos quickly | Adobe Scan or built-in camera — 300–600 dpi, Color, Lossy compression | Capture with even light, auto-enhance, crop, export as PDF or high-res image. |
| Batch receipts for expenses | Microsoft Lens or CamScanner — 300 dpi, Color/Grayscale, Auto-crop | Scan multiple receipts, group per expense report, export single PDF per report, sync to accounting app. |
File size reduction tips
- Choose grayscale for text documents.
- Downsample images to 300 dpi if originals are higher.
- Use moderate JPEG compression for photos inside PDFs.
- Remove unnecessary blank pages and heavy color backgrounds.
- Use tools like PDFsam, Adobe Acrobat, or online compressors to optimize final PDF.
Security and sharing
- Password-protect sensitive PDFs when sharing.
- Remove metadata if you need anonymity.
- Use encrypted cloud services or secure links for confidential documents.
Quick app pick (one-line recommendations)
- Best built-in iOS: Apple Notes.
- Best for OCR: Adobe Scan.
- Best free Windows: NAPS2.
- Best for Office users: Microsoft Lens.
- Best all-rounder: Scanner Pro.
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