You no longer need a dedicated flatbed scanner to digitise paper documents. The camera in your pocket can produce clean, professional-quality scans — a great first step toward going paperless at home — with automatic edge detection, perspective correction, and instant PDF output. Here's how to do it for free.
Why phone scanning beats a flatbed scanner for everyday documents
Flatbed scanners are bulky, slow, and expensive. For everyday documents — receipts, contracts, letters, ID copies, handwritten notes — a modern smartphone camera at 12 MP or higher produces more than adequate quality. The key difference is the software: a good scanning app corrects perspective, enhances contrast, and merges pages automatically. A raw camera photo doesn't do any of that.
How to scan a document with PrimeDocu (step-by-step)
PrimeDocu's built-in document scanner runs entirely on your device. Scans are encrypted before they leave your phone, so sensitive documents stay private.
- Create a free account at primedocu.com — no credit card required.
- Tap the Scan button in the app or web version.
- Point your camera at the document on a flat surface. PrimeDocu highlights the edges in real time as it detects the document boundary.
- Hold steady — the app captures automatically when it detects a stable, clear document, or you can tap the shutter manually.
- Review the scan. Adjust the crop handles if needed and apply contrast enhancement for crisper text.
- Add more pages if the document has multiple sheets — tap "Add page" and repeat.
- Save as PDF. Your multi-page PDF is created instantly and stored in your encrypted vault.
Tips for the best scan quality
- Good lighting is everything. Natural light or a bright overhead light works best. Avoid harsh shadows across the page.
- Flat surface. Place the document on a contrasting background (dark table, light paper works well).
- Shoot directly above. Position the camera directly overhead when possible — even if you're at a slight angle, perspective correction will straighten it.
- Avoid glare on glossy documents. Tilt the document slightly or reposition the light source if you see reflections.
- Use contrast enhancement for handwritten notes, receipts, and old documents — it makes faint text much more readable.
Phone scanner app comparison
| App | Platform | Free | Multi-page PDF | Encrypted storage |
|---|---|---|---|---|
| PrimeDocu | Web, iOS, Android | ✅ Free forever | ✅ | ✅ AES-256-GCM |
| Microsoft Lens | iOS, Android | ✅ Free | ✅ | ❌ (OneDrive) |
| Apple Notes | iOS / macOS only | ✅ Free | ✅ | ❌ (iCloud) |
| CamScanner | iOS, Android | ⚠️ Limited free | ✅ | ❌ |
| Adobe Scan | iOS, Android | ✅ Free | ✅ | ❌ (Adobe cloud) |
Frequently asked questions
Is a phone scan good enough for official documents?
For most everyday use — contracts, receipts, ID copies, letters — yes. Modern phone cameras produce scans that are sharp enough for email, PDF archiving, and most legal purposes. For court submissions or archival quality, a dedicated flatbed scanner may be required.
What format does PrimeDocu produce?
A high-resolution PDF by default. Individual pages can also be exported as JPEG or PNG. PDFs are universally accepted and preserve layout across all devices.
Can I scan multiple pages into one PDF?
Yes. Scan as many pages as you need in one session. PrimeDocu automatically combines them into a single ordered multi-page PDF.
Are my scans private?
Yes. Every scan is encrypted on your device using AES-256-GCM before upload. The encryption key never leaves your device — not even PrimeDocu can read your documents.