Scan a Document Online

How this works

Scanning a document online means doing the whole job on a web page — upload a photo, get a corrected scan back — with nothing to install and no account.

Because the scan is built entirely in the browser, the heavy edge-detection code (opencv.js, several megabytes of WebAssembly) is only fetched the first time you tap Auto-detect, so the page itself loads instantly and the file never has to leave your device to be processed.

What you get

It works the same on Windows, Mac, Android and iPhone, with no app to keep updated and no watermark stamped across the page — handy on a borrowed or locked-down computer where you can't install software.

Download the finished scan straight from the browser as a PDF (Fit, A4 or Letter) or a PNG.

Tip

Open this page in your phone's own browser so you can shoot the photo and download the PDF on the same device, without ever transferring the file to a computer.

Enhance filters explained

After the page is straightened, an enhance filter cleans it up. Each one is applied to the corrected scan in your browser; here is exactly what they do and when to use each.

Magic (colour)

Stretches contrast about 1.35× around mid-grey and adds a small brightness lift, so dull greys become white and text deepens — the classic colour-scan look. Colour is kept. Best for: Most documents, and anything with colour you want to keep (logos, highlights, coloured forms).

Black & White

Measures the page's average brightness, biases the cut-off toward white paper (≈0.82× the mean), then forces every pixel to pure black or pure white. The result is a clean, high-contrast bi-tonal page. Best for: Text-only pages, and the cleanest input for OCR; also gives the smallest PDF.

Grayscale

Converts to neutral grey using the standard Rec. 601 luma weights (0.299 red + 0.587 green + 0.114 blue), keeping soft tones without colour. Best for: Pages with photos or shading where pure black-and-white would lose detail, but colour isn't needed.

Original

Leaves the warped pixels exactly as photographed — perspective is still corrected, but no contrast, brightness or colour change is applied. Best for: When you only want the page straightened and cropped, or you'll do your own colour edits afterwards.

PDF page sizes

Save a PNG, or a single-page PDF in one of these sizes. Fit makes the page exactly the scan's pixels (no margins); A4 and Letter centre the scan on a standard page. Sizes are shown in millimetres, inches and PDF points (1 pt = 1/72 in).