How to Scan a Document With Your Phone (Free, No App)

Step by step

1. Open the scannerGo to the Document Scanner — it runs entirely in your browser, with no app to install and nothing uploaded.
2. Add a photo of your pageTake a photo or upload one. It does not need to be perfectly square or perfectly lit — you will correct the angle next. Even light and a background that contrasts with the paper help the most.
3. Mark the corners and pick a lookDrag the four corner markers onto the edges of the document, then choose Color, Grayscale, or Black & White. B&W gives the crispest scanner look for plain text.
4. Flatten, add pages, and exportFlatten the page to apply the correction, add more photos as extra pages if you need them, then export a single multi-page PDF (or a PNG for one page).

What "scanning" a photo actually means

A real scanner sees a page flat and square on. A phone photo almost never does — you shoot at a slight angle, so the rectangular page shows up as a skewed four-sided shape, often with one edge longer than the other. Turning that snapshot into a scan means undoing the angle so the page becomes a clean, upright rectangle again, and then fixing the lighting so the text reads sharply.

Why you mark the four corners

The tool cannot reliably guess where your document ends and the desk begins, so you tell it by dragging the four markers onto the page corners. From those four points it computes a perspective transform (a homography) that maps your skewed quadrilateral back to a true rectangle — the same maths a dedicated scanner app uses. Placing the corners accurately is the single biggest factor in how good the result looks, so it is worth zooming in and being precise.

Getting crisp, readable text

Black & White mode runs an adaptive threshold: rather than one brightness cutoff for the whole image, it judges each area against its own neighbourhood, so uneven lighting and shadows do not wash out one side of the page. The result is dark, solid text on a clean white background, exactly like an office scanner. Grayscale keeps shading for pencil notes or photos, and Color preserves coloured forms, stamps, or highlighter.

Multi-page documents

Real paperwork is rarely a single page. Scan each page in turn — photograph, correct, flatten — and the tool stacks them in order, then exports them as one PDF. That makes it practical for contracts, multi-page forms, a batch of receipts to file, or a stack of handwritten notes, without needing a separate tool to merge the pages afterwards.

Nothing leaves your device

The documents people scan are often exactly the ones they least want to upload: passports and IDs, signed contracts, medical letters, bank statements. Because every step — the photo, the perspective correction, the thresholding, the PDF assembly — happens in your browser, none of it is ever sent to a server. It is processed on your own phone or computer and stays there.