How to Scan Documents to PDF with Your Phone (No App Needed)
A phone camera can produce scans good enough for applications, site paperwork, and receipts, as long as you get a few basics right. This guide covers how to photograph pages so they're readable, how to combine them into one PDF in the browser, and how to keep the file a sensible size.
What you need
A phone with a camera, a current browser (Chrome, Samsung Internet, Safari, or Firefox), and a flat surface. Open Scan to PDF; tapping the capture area opens your camera directly, with no app to install.
Get the photo right
Light
Even light is more important than bright light. Daylight near a window is ideal. Avoid a single overhead lamp that puts your own shadow over the page, and turn off the flash, which creates a glare spot on glossy paper.
Background
Place white paper on a dark, plain surface such as a desk or a folder. The contrast makes the edges obvious and the page easy to read. Avoid patterned tablecloths.
Angle
Hold the phone parallel to the paper, directly above it. Shooting at an angle turns rectangles into trapezoids and makes text at the far edge smaller. Scan to PDF doesn't straighten or crop photos automatically, so it's worth getting this right in the shot.
Framing
Fill the frame with the page, leaving a small margin. Tap the screen on the text to focus before taking the picture. Check that the photo is sharp before moving to the next page.
Combine the pages
- Tap the capture area and photograph page 1.
- Tap the capture area again for each further page. Earlier photos are kept.
- Drag the thumbnails if a page ended up out of order.
- Tap Combine. The PDF downloads as
scan.pdf; rename it to something meaningful.
Already have the photos in your gallery? JPG to PDF combines existing JPG and PNG images the same way.
A note about photo formats
Scan to PDF and JPG to PDF accept JPG and PNG. Recent iPhones save gallery photos in HEIC format by default, which isn't supported. Photos taken through the browser's capture button are normally delivered as JPG, so the simplest approach is to shoot from inside the tool. To change the default on iPhone, go to Settings > Camera > Formats and choose Most Compatible.
Keep the file size down
Phone photos are typically 2 to 6 MB each, so a five-page scan can be 20 MB or more. That's often too big for email or application portals. Run the PDF through Compress PDF; Medium is a good starting point for scans. The PDF file size guide explains the levels.
Make the text searchable or editable
A scan is a picture of text, so you can't search it or copy from it. If you need to, open the PDF in Edit PDF and use the OCR button, or convert it with PDF to Word, which reads scanned pages automatically. OCR downloads its engine the first time it's used, so do that step with an internet connection.
Privacy on a phone
Photos of IDs and signed forms are sensitive. In Scan to PDF the photos go from your camera into the browser tab and are combined there; they aren't uploaded to Maher PDF. Afterwards, consider deleting the individual photos from your gallery if you saved any, so copies of your documents don't linger on the phone or in cloud photo backups.
Checklist for a clean scan
- Even daylight, no flash, no shadow
- Dark plain background
- Phone held flat above the page
- Text in focus, photo checked before the next page
- Pages in order before combining
- Compressed if it needs to be emailed