Can I straighten a document I shot at an angle?

Yes. The scanner finds the four corners automatically and corrects perspective; the document becomes a flat rectangle as if viewed head-on, with the background cropped.

How do I remove shadows from a document?

The «Auto» filter balances background lighting to remove shadows and flatten the background toward white. This filter is a Pro feature; Color/Gray/Black & White filters are free.

Which filter gives the smallest file?

Black & White gives the sharpest text and smallest file; it's ideal for plain text documents. For color documents, prefer Color or Auto.

Turn a Document Photo into a Clean PDF

When you photograph a document, the result is usually skewed, with clipped corners and a shadow on one side. A good document scanner fixes these automatically. Here's how perspective correction and shadow removal work.

Photographing a paper document is easy; but the result rarely looks like a «scan»: the document is skewed, the desk is in frame, one corner is in shadow. A good scanner steps in exactly here — turning the photo into a flat, clean document.

Perspective correction: making a skewed document flat

Because you don't shoot perfectly top-down, the edges aren't parallel and the document looks slanted. The scanner finds the four corners automatically and recomputes the image, turning the document into a flat rectangle as if viewed head-on. The desk behind it is cropped away, leaving only the document.

Shadow removal and contrast (Auto filter)

Handheld shots rarely have even light; one edge is dark, another bright. The «Auto» filter estimates and balances background lighting on each color channel to remove shadows and flatten the background toward white — text sharpens, colors stay. It's similar to the «magic color» effect in scanner apps.

Which filter, when?

Color: for invoices with logos and documents with photos.
Gray: text-heavy documents; smaller file.
Black & White: sharpest text, smallest file — ideal for plain text.
Auto (Pro): shadow removal + contrast; the most professional, scanner-like output.

Step by step: a quality scan

Good light and a flat surface: Place the document on a flat surface and shoot from above without casting a shadow. Keep contrast between the surface and the document so edges are easy to find.
Wait for auto-capture: Hold the camera steady; edges are marked with a green outline and the document is captured by itself.
Pick a filter and create: Choose the right filter for the document and create the PDF; adjust corners if needed.

Image → PDF — Turn your document photos into a single PDF — on your device, no sign-up.

If the file is large after scanning, use Compress to reduce its size; to reorder, rotate or delete pages, open your scanned PDF directly in the matching tool.