Best Free Online Document Scanner — Scan Docs with Camera (No App)
Scan documents online free using your phone or desktop camera. Perspective correction, multi-page PDF, B&W mode — no app, no upload, works instantly in any browser.
Quick Answer: Use ViewAnyFile Document Scanner to scan documents with your camera for free. It runs entirely in your browser — no app download, no account, no upload to a server. Captures, perspective-corrects, enhances, and exports as PDF, JPG, or PNG in seconds.
Why Use a Browser-Based Document Scanner?
CamScanner, Adobe Scan, and Microsoft Lens are great apps — but they require installation, account creation, and in some cases upload your documents to cloud servers. For quick, one-off scans where privacy matters, a browser scanner is faster and safer.
- ✅ No install — works on iPhone, Android, Mac, Windows, Chromebook
- ✅ No account — open the page and start scanning immediately
- ✅ No upload — files never leave your device
- ✅ Free forever — no trial, no watermark, no limits
How the Document Scanner Works
The scanner uses three steps:
- Capture — use your device camera or upload a photo of the document
- Adjust — drag the four coloured corner handles to align with the document edges
- Result — the scanner applies perspective correction and enhances the image
The core technology is a 4-point homography transform — the same math used in professional scanning software. It maps your skewed, angled photo back to a flat, straight rectangle as if scanned on a flatbed scanner.
Perspective Correction: Why It Matters
When you photograph a document on a desk, the camera angle makes edges look trapezoid-shaped instead of rectangular. Perspective correction (also called "dewarping" or "keystone correction") reverses that distortion.
The algorithm solves an 8-variable linear system to find the exact transformation matrix, then applies bilinear interpolation to produce a smooth, pixel-accurate result — no jagged edges or blurring.
Enhancement Modes
After perspective correction, choose how the final scan looks:
- 🎨 Color — exact colours from the photo, perspective-corrected only
- 🔲 Grayscale — converts to black-and-white tones using the standard luma formula
- ✨ Enhanced — grayscale + automatic contrast stretch (best for most documents)
- 📄 B&W — adaptive threshold: pure black text on pure white background, classic scan look
The B&W mode uses an integral image for O(n) performance — it processes a 2000 × 3000 pixel scan in under 200ms on any modern device.
Multi-Page Documents
Real documents have multiple pages. The scanner supports scanning multiple pages into a single document:
- Scan the first page → tap Add Page
- Scan each subsequent page
- Reorder or delete any page from the thumbnail strip
- Name your document and download as a multi-page PDF or a ZIP of JPGs
This makes it practical for contracts, invoices, passbooks, handwritten notes, and any multi-page document you need to digitise quickly.
How to Scan a Document on Your Phone
- Open viewanyfile.app/tools/doc-scanner in your mobile browser
- Tap Use Camera — the rear camera activates automatically
- Hold your phone above the document and tap Capture
- Drag the four corners to align with the document edges
- Choose your enhancement mode (Enhanced works for most documents)
- Tap Scan Document
- Download as PDF, JPG, or PNG
The whole process takes under 30 seconds for a single page.
How to Scan Multiple Pages into One PDF
- Scan your first page as described above
- On the result screen, tap Add Page
- Scan the next page
- Repeat for all pages
- Name your document (e.g. "Invoice March 2026")
- Tap PDF (X pages) to download a single merged PDF
CamScanner vs Browser Scanner — Comparison
| Feature | CamScanner | ViewAnyFile Scanner |
|---|---|---|
| App download required | ✅ Yes | ❌ No |
| Account required | ✅ Yes | ❌ No |
| Files uploaded to server | ✅ Yes | ❌ No |
| Free (no watermark) | ⚠️ Limited | ✅ Always |
| Multi-page PDF | ✅ Yes | ✅ Yes |
| Works on desktop | ⚠️ Limited | ✅ Yes |
Privacy & Security
The scanner processes everything using the Canvas 2D API inside your browser tab. Your photos and documents are never transmitted to any server — not even for logging or analytics. When you close the tab, nothing is retained.
This is important for sensitive documents: medical records, passports, financial statements, legal contracts — anything you wouldn't want on a third-party server.
Supported File Inputs
- Camera — any device with a camera (phone, tablet, webcam)
- JPG / JPEG — photos from gallery
- PNG — screenshots or camera output
- HEIC / HEIF — iPhone native format
- WebP — modern compressed format
Images are automatically downscaled to a maximum of 3000px on the longest side for fast processing.
Start Scanning Now
No sign-up, no download. Open the scanner and start digitising documents in seconds: