Document Scanner

How this works

The full document scanner turns a photo of a page, receipt, form or card into a clean, square-on scan and saves it as a PDF or PNG — no flatbed, app or sign-up.

It runs the complete pipeline in your browser: detect the page's four corners, warp that quadrilateral onto a flat rectangle with a perspective transform, then apply an enhance filter that whitens the paper and sharpens the text before exporting.

What you get

You get a scanner-quality result from any phone camera, with the slant removed and the page cleaned up, instead of a dim, angled snapshot that looks like a photo of paper.

Export a PNG (lossless) or a single-page PDF sized to fit the scan, A4, or US Letter; combine several scans into one PDF afterwards with the Image to PDF tool.

Tip

Fill most of the frame with the page on a plain, contrasting surface in even light — high paper-to-background contrast is what lets auto-detect lock onto all four corners.

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).