Document scanner

No. Perspective correction, filters, and PDF creation all happen inside your browser. Your photos and documents never leave your device, so you can scan contracts, prescriptions, or other private paperwork.

It looks for the sheet of paper in the photo: it evens out the lighting, tries several thresholds (local contrast, shadows, and glare), and picks the most plausible four-sided shape. It copes with light backgrounds, hard shadows, and soft glare. When the scene is tricky and confidence is low, it tells you to check the corners and adjust them by hand, which only takes a few seconds.

Once you set the four corners, the tool straightens the page and redraws it as if you had photographed it head-on. The black and white filter also uses an adaptive threshold that separates the text from the paper and removes shadows.

Use “Color” if your document has stamps, colored signatures, or photos. Use “Grayscale” for text with soft shadows. Use “Black and white” for contracts and notes: the file is smaller and the text is cleaner and easier to read.

Letter is the standard paper size in the United States and Canada, and A4 is the standard almost everywhere else. Both add a small margin around the page. “Image size” makes each PDF page match its scan exactly, with no margins.

Yes. Add as many photos as you like and check each one in the editor. When you create the PDF, you get one file with one page per photo, in the order shown in the list. Photos are scaled down to a manageable size before they are processed, so ten or twenty pages work fine on any phone.