How to Scan Documents with Your Phone and Get a Clean, Readable PDF
Practical tips for scanning forms, receipts, and notes with a phone camera: lighting, angle, cropping, file size, and turning the photos into one PDF.
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A phone is good enough, if you shoot it right
Modern phone cameras capture more detail than most office scanners need. What separates a crisp, professional-looking scan from a grey, skewed photo is almost entirely how the picture is taken. Get the light, the angle, and the crop right and nobody will know it did not come from a scanner.
Set up the shot
- Background: put the page on a dark, plain surface such as a table or a dark cloth. The contrast makes the edges easy to see and to crop.
- Light: daylight from a window is ideal. Avoid a single lamp to one side, which throws a gradient across the page, and keep your own shadow off the paper.
- Flatness: flatten folds and curled corners. A book along the edges helps with receipts and old letters.
- Glossy paper: tilt the page slightly away from the light to get rid of glare on photos and laminated cards.
Take the photo
Hold the phone directly above the page, with the screen parallel to the paper. Shooting at an angle makes the page look like a trapezium and the text at the far edge smaller.
Fill the frame with the page but leave a small margin around it so you can crop accurately. Tap on the text to focus before you take the picture, and hold still for a moment: most blur comes from moving as the shutter fires, especially in dim light.
Take two shots of anything important. It costs nothing and saves going back if one turns out blurry.
Crop and combine into a PDF
Open Scan to PDF in your phone's browser and tap Scan / Take Photo. After each shot, drag the crop corners to the edges of the paper so the desk and your fingers disappear. Add the next page, repeat, and generate the PDF when you are done. The photos are processed on your phone and are not uploaded.
If you already have well-framed photos in your gallery and do not need to crop them, JPG to PDF combines them in one step and lets you arrange the order.
Keep the file size sensible
Each phone photo is several megabytes, so a ten-page scan can easily pass 30 MB, too large for many email and upload limits. Two fixes:
- Shrink the finished PDF with Compress PDF, choosing the limit the form or email allows
- Only scan the pages that are needed, or remove extra pages from the finished PDF
For ID cards and certificates that will be viewed on screen, compressed photos are more than sharp enough.
After scanning
- Sideways page? Fix it with Rotate PDF, choosing only that page
- Need the text? Run the photo through Image to Text to copy the words out
- Sending ID or financial documents? Add a password with Protect PDF and send the password separately
- Want a black-and-white look for printing? Convert photos with Image to Grayscale before making the PDF
Scanning ID cards and both sides of a page
For ID cards, scan the front and back as two separate pages in the same PDF, front first. Lay the card on a dark surface and fill most of the frame with it, so the details are large enough to read when the PDF is viewed on screen.
For double-sided documents, scan every front and back in order: page 1 front, page 1 back, page 2 front, and so on. If any back is blank, skip it rather than including an empty page. If you discover a mistake after generating the PDF, Remove PDF Pages or Rotate PDF can fix individual pages without rescanning everything.
Receipts and faded paper
Thermal-paper receipts fade over months, so scan them soon after you get them. If the print is already faint, shoot in bright, even light and convert the photo to black and white with Image to Grayscale before making the PDF; the stronger contrast often makes faded figures easier to read.
Try Scan to PDF
Free, with no account. It runs in your browser, so your files are not uploaded.
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