Introduction
Your phone is the best scanner you own. Point the camera at a document, and the best PDF scanner apps automatically find the edges, fix the perspective, clean up the lighting, and save a crisp PDF you can share, sign or store.
This guide compares the best PDF scanner apps for Android and iPhone. We look at scan quality, text recognition (OCR), signing, cloud storage, and price, so you can replace the office scanner for good.
How to Choose a PDF Scanner App
Three things matter most. First, automatic edge detection — the app should find the page and straighten it without you dragging corners. Second, OCR: the ability to turn a photo of text into searchable, copyable text. Third, what happens after the scan: can you sign it, share it, save it to the cloud, and find it again later?
Also check the price trap: many scanner apps are free to scan but charge for OCR, signing, or removing watermarks. The apps below are ranked with their free versions in mind.
1. Adobe Scan — Best Overall Scanner
Adobe Scan is the best PDF scanner app for most people. It automatically detects document edges, cleans up shadows and glare, and produces sharp, readable PDFs. Its OCR is excellent — it turns scans into searchable text and can convert a scan into an editable document.
It is free, with no watermark, and it connects to Adobe Document Cloud and Acrobat for editing and signing. The app also recognises business cards and whiteboards automatically.
The free version covers scanning and OCR well. Advanced features — combining files, editing PDFs, premium storage — need an Acrobat subscription. For everyday scanning, the free version is enough.
Best for: high-quality scans with free OCR. Price: free; Acrobat subscription for advanced features.
2. CamScanner — Best for Features
CamScanner is the most feature-rich scanner app: automatic edge detection, OCR, document signing, watermarks, fax, cloud storage, and collaboration. It has been around for over a decade and is the most popular scanner app in the world.
Its scanning quality is excellent, and the document management features — folders, tags, search — are the best on this list. It also handles IDs, books and receipts well.
The free version shows ads and adds a watermark to shared files unless you pay. CamScanner has also faced security questions in the past (a malicious ad module was found in 2019 and removed), so keep the app updated and download only from the official store.
Best for: the most features in one scanner app. Price: free with ads; Premium removes watermark.
3. SwiftScan — Best for Speed and Simplicity
SwiftScan (formerly Scanbot) is the fastest scanner on this list. Open it, point, and it captures the page automatically — no tapping, no waiting. Quality is excellent, with automatic edge detection, colour correction, and OCR.
It is the best choice if you scan many pages in a row, like a whole contract or a stack of receipts. It also integrates with cloud services and supports workflows that send scans straight to email or cloud folders.
SwiftScan is a paid app after a short trial, and its free version is limited. But for fast, high-volume scanning, it is worth the price.
Best for: fast batch scanning. Price: free trial, then subscription.
4. Genius Scan — Best for Privacy
Genius Scan is the best scanner app for privacy. It processes everything on your device — your documents never leave your phone unless you choose to share them. There is no account required and no cloud upload by default.
Scanning quality is excellent, with smart detection, perspective correction, and OCR. It also supports batch scanning, PDF export, and integration with cloud services when you want it.
The free version covers basic scanning well; the paid version adds OCR, smart document naming, and cloud export. For sensitive documents — IDs, contracts, medical records — Genius Scan is the safest choice.
Best for: private, on-device scanning. Price: free; paid version adds OCR and export.
5. TurboScan — Best One-Time Purchase
TurboScan is the best scanner app if you hate subscriptions. It costs a one-time payment and gives you everything: fast scanning, excellent edge detection, OCR, multi-page PDFs, and cloud sharing.
Its SureScan feature takes three photos of each page and combines them into one sharper image — a clever trick that produces noticeably better scans in poor lighting.
TurboScan's interface is dated and it has fewer management features than CamScanner. But for a single payment and no subscription, it is the best value scanner app.
Best for: a one-time purchase with no subscription. Price: one-time purchase.
6. Google Drive Scan — Best Built-In Option (Android)
Google Drive's built-in scanner (tap the camera icon in the Drive app) is the best free option for Android users who already use Drive. It detects edges, enhances the image, and saves the PDF straight to your Drive — no extra app needed.
Quality is good, though not as polished as Adobe Scan, and OCR happens automatically in Drive (your scanned PDFs become searchable). It is completely free with no watermark.
iPhone users get the same convenience from Apple Notes: open a note, tap the camera, choose Scan Documents, and the scan saves to your note as a PDF.
Best for: free scanning with no extra app. Price: free, built in.
Comparison Table
| App | Best for | OCR | Signing | Watermark (free) | Price |
|---|---|---|---|---|---|
| Adobe Scan | Overall quality | Yes, free | Yes | No | Free, subscription |
| CamScanner | Most features | Yes | Yes | Yes | Free, Premium |
| SwiftScan | Fast batch scans | Yes | Yes | No | Trial, subscription |
| Genius Scan | Privacy | Paid | Yes | No | Free, paid |
| TurboScan | One-time purchase | Yes | Yes | No | One-time |
| Google Drive | Built-in Android | Yes (Drive) | No | No | Free |
Frequently Asked Questions
What is the best free PDF scanner app? Adobe Scan. It is free, has no watermark, and includes excellent OCR. Google Drive's built-in scanner is the best free option if you already use Drive.
Can I scan documents with my iPhone without an app? Yes. Open Apple Notes, tap the camera icon, and choose Scan Documents. It detects edges, corrects perspective, and saves a PDF — no extra app needed.
Is it safe to scan sensitive documents with a scanner app? Use Genius Scan or Adobe Scan for sensitive documents — Genius Scan processes everything on your device, and Adobe Scan is from a trusted company. Avoid unknown scanner apps, and never scan IDs or contracts with an app that uploads everything to an unknown server.
Can scanner apps recognise text (OCR)? Yes. Adobe Scan, CamScanner, SwiftScan and TurboScan all include OCR, which turns your scan into searchable, copyable text. Free versions sometimes limit OCR — check before you rely on it.
Download
Get these scanner apps free from the official stores:
- Adobe Scan — Google Play · App Store
- CamScanner — Google Play · App Store
- SwiftScan — Google Play · App Store
- Genius Scan — Google Play · App Store
- TurboScan — Google Play · App Store
Always download from the official Google Play Store or Apple App Store.
Conclusion
Start with Adobe Scan — free, no watermark, excellent OCR. If you scan sensitive documents, use Genius Scan for on-device privacy. If you scan in bulk, SwiftScan is the fastest. And if you just need a quick scan, your phone already has one built in: Google Drive on Android, Apple Notes on iPhone. For scanning QR codes rather than documents, our guide to the best QR scanner apps covers that side of your phone's camera.