Document Scanner
Turn your phone into a document scanner. Capture a page with the camera, let it auto-crop and de-skew, clean it up, and save a multi-page PDF — free, in your browser, with nothing uploaded.
Edge detection and scanning run in your browser — nothing is uploaded.
Click to choose an image or drag and drop it here
JPG, PNG or WebP — or use the camera above
How it works
When you start the camera, each frame is analysed on a downscaled copy by OpenCV.js — the WebAssembly build of the same computer-vision library used across the industry — to find the four corners of the page. A green outline shows the detected edges in real time. When you capture, the tool takes the full-resolution frame, applies a perspective transform so the page becomes a clean rectangle (no more keystoned, photographed-at-an-angle look), and stores it as a page. Enhancement modes then adjust the pixels: Grayscale drops colour, Black & White applies an adaptive threshold for crisp text, and Magic Color stretches the contrast to whiten the paper and deepen the ink. Everything — capture, cropping and cleanup — happens on your device.
How to scan a document
- Tap Use camera and allow access (or Upload a photo).
- Point at the page until the green outline locks on, then tap Capture.
- Add more pages; drag thumbnails to reorder, or remove any you do not want.
- Choose an enhancement: Original, Grayscale, Black & White or Magic Color.
- Click Download PDF for one file, or Download images.
Why scan in your browser instead of an app
Mobile scanner apps routinely ask for broad permissions, upload your pages to their servers to "process" or store them, and bury the export-to-PDF feature behind a subscription. The documents people scan — IDs, contracts, receipts, medical forms — are exactly the things you would least like sitting on someone else's cloud. This scanner asks only for camera access, does all of its work locally, and never transmits a single frame. After the first visit it is cached and works offline, there is no sign-up, and the multi-page PDF export is free with no watermark.
Related tools
New here? Read how to merge pdfs without losing quality or browse all our PDF guides.
Frequently asked questions
Do I need to install an app?
No. This is a web page that uses your device camera directly. Open it on your phone, allow camera access, and scan — there is nothing to download from an app store, and nothing is installed on your device beyond the cached page.
Are my scans uploaded anywhere?
No. Edge detection, perspective correction and enhancement all run in your browser with OpenCV.js. Your camera frames and finished scans never leave your device — there is no server, no account and no upload.
Why does the first scan take a moment to start?
The first time you use the scanner it downloads the computer-vision engine (about 9 MB). That happens once and is then cached, so every later scan starts instantly, even offline.
Can I scan more than one page into a single PDF?
Yes. Capture or add as many pages as you like; each appears as a thumbnail you can drag to reorder or delete. When you are done, export them all as one multi-page PDF, or download them as separate images.
The edges were not detected — can I still scan?
Yes. If no paper outline is found, the photo is kept whole so you still get a usable scan. For best automatic cropping, place the document on a contrasting surface with the whole page in frame and even lighting.