How to scan a document to PDF with your phone

The short answer

Put the page on a flat, plain surface in good light, open a scanner app, hold the phone parallel to the page and let the app detect the edges. Check the preview, retake if the text is blurry, then save the result as a PDF. A scanner app is better than a normal photo because it corrects perspective, crops to the page and improves contrast.

lightbulb Light and a flat page matter more than the phone. Daylight from a window beats a lamp that casts shadows.

Get a good scan: a quick checklist

1. Use a contrasting background. A dark table under a white page makes edge detection easy.
2. Flatten the page. Creases and curled corners cause distorted text.
3. Light it evenly. Avoid your own shadow falling on the page and avoid glare on glossy paper.
4. Hold the phone parallel to the page, directly above it, so the lines of text stay straight.
5. Fill the frame, but keep all four corners visible so the app can find the edges.
6. Check the preview. If a letter is hard to read on screen, it will be hard to read in the PDF. Retake it.

Photo or scan: what is the difference?

Keep the PDF small enough to send

Many portals and email services limit attachment size, so a ten-page scan at full photo resolution can be too big. Scan at a normal document resolution rather than the highest setting, use black-and-white or greyscale for text pages, and keep colour only for photos or stamps that need it.

If a PDF is still too large, you can shrink it with a free browser tool without uploading it anywhere.

Combine pages and share safely

• Scan every page in one session so they stay in order, then export a single PDF.
• Name the file clearly before sharing, for example “rent-agreement-2026.pdf”, not “scan_0412.pdf”.
• Think before you send IDs and bank documents. Share only the pages needed, and delete the copies from shared folders afterwards.
• If you need to hide numbers or names, redact the PDF properly instead of drawing a black box over it.

Scan QR codes and barcodes too

A phone scanner is often needed for more than paper. QR codes on menus, tickets, payment pages and Wi-Fi labels, and barcodes on products, all need a camera scanner. An all-in-one app saves you installing two.

The QR and Document Scanner app from Robince Studio is free for Android. It scans documents to PDF, reads QR codes and barcodes, creates QR codes, and keeps your scans in one library where you can share or export them.

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