Step-by-step instructions for scanning any document to PDF — on iPhone, Android, Mac, and Windows. Every free built-in method, the best scanner app, and pro tips for crisp, searchable results every time.
Frequently Asked Questions
Can I scan documents to PDF for free?
Yes. Every major platform has a free built-in scanner: Notes or Files app on iPhone, Google Drive on Android, Preview on Mac, and Windows Fax and Scan + Microsoft Print to PDF on Windows PC. No paid app needed for basic scanning.
What is the best app to scan documents to PDF on iPhone?
Scanjet is the top-rated iPhone scanner — it produces professional PDFs with auto edge detection, OCR in 23 languages, and HIPAA-grade privacy. Free to download from the App Store.
How do I scan multiple pages into one PDF?
On iPhone, keep tapping the shutter after each page — Notes and Files merge all pages into one PDF automatically. In Scanjet, tap the plus button to add pages. On Android (Google Drive), tap the add-page icon between scans. See our [guide to scanning multiple pages into one PDF](/blog/how-to-scan-multiple-pages-into-one-pdf/) for full steps.
What resolution should I use for scanning documents?
300 DPI is the standard for text documents — it balances file size and readability. Use 600 DPI for fine print or documents you need to enlarge later. Phone camera scanner apps handle resolution automatically.
How do I make a scanned document searchable with OCR?
Use an app with built-in OCR: Scanjet covers 23 languages, Google Drive makes Android scans searchable automatically, and Preview on Mac applies OCR to flatbed scans. For desktop-only workflows, Windows Scan or Adobe Acrobat Reader also support OCR.