How to scan a document to PDF with your phone camera

Why a photo is not a scan

A camera roll photo carries the whole scene: shadows, desk texture, the edge of a keyboard, a colour cast from the room lighting. A scan is a flat, high-contrast page on white. The difference is not resolution — phone cameras have plenty — it is framing and tonal correction.

It also matters for size. A colour photograph of a page is often 3-5 MB; the same page converted to high-contrast grayscale is a fraction of that, which is why a ten-page 'scan' made from raw photos so often bounces from an inbox.

Getting a clean capture

• Put the page on a plain, contrasting surface and shoot from directly above — tilting the phone makes text at the far edge blur and the page look trapezoidal.
• Use indirect daylight where possible. Overhead lights create a bright hotspot in the middle and dark corners.
• Fill the frame with the page, leaving a small border. Cropping later throws away detail you already captured.
• Watch for your own shadow: stand to the side of the light source, not between it and the page.

What the document filter does

The document setting converts each captured page to grayscale, then stretches the tonal range so the lightest part of the paper becomes white and the ink becomes near-black. Anything in between — a faint shadow, a coffee ring, a slightly grey page — gets pushed towards white.

That is usually what you want for text, forms, contracts and receipts. It is the wrong choice for anything where colour carries meaning: a stamped seal, a highlighted clause, a colour chart or a photograph. Switch to original colours for those pages, and accept a larger file.

Keeping a multi-page scan manageable

Capture every page in one session and put them in order before generating the PDF; assembling separate single-page files afterwards is where page order goes wrong. If the finished document is still too heavy for an email limit, compress it rather than re-shooting at lower quality — you keep the option of a full-quality copy for your own records.

Privacy: why browser scanning matters here

Scanned documents are exactly the material you least want on someone else's server: passports, bank letters, contracts, medical forms, signed agreements. Scanner apps commonly ask for cloud sync and account creation, and the transfer is invisible once granted.

The scanner below reads your camera stream locally, processes each page on a canvas in your browser, and writes the PDF on your device. Nothing is transmitted, and the camera stops the moment you close the tab.

Step by step

1. 1Open the scanner below on your phone and press Start camera, then allow camera access.
2. 2Frame the first page squarely from above and capture it.
3. 3Repeat for every page, checking each thumbnail before moving on.
4. 4Reorder pages if needed, keep the document filter for text or switch to original colours for pages where colour matters.
5. 5Choose the page size and margin, press Create PDF and download the result.
6. 6If the file needs to fit an email limit, run it through the compressor afterwards.

Frequently asked questions

Do I need to install an app?

No. The scanner runs as a web page in your mobile browser using the standard camera API, so there is nothing to install and no account to create.

Can I use it on a laptop webcam?

Yes, though a webcam's fixed focus and lower resolution make small print harder to read than a phone's rear camera. On a phone, the rear camera is used by default.

Will the PDF text be searchable?

No. A camera scan is an image of the page, so the text is not machine-readable. If you need searchable text, keep the original digital document rather than scanning a printout.

Are my scans uploaded to a server?

No. The camera frames and the finished PDF stay on your device; the page contains code that runs locally, which is why it also works with the network disconnected once loaded.