How to Turn Phone Photos into a Clean PDF Scan: 3 Steps and Shooting Tips

Paperly team · Updated 2026-11-02 · 6 min read

Photo vs. scan: what's the difference

Forms, schools and offices often ask for a "scanned copy". A plain phone photo tends to get rejected or prints badly, usually for these reasons:

All of this can be fixed after you take the photo, as long as the photo itself is sharp. So let's start with shooting.

Before you shoot: 5 tips

1. Use a dark, plain background

   White paper on a dark desk gives a strong edge, which makes automatic edge detection most accurate. Avoid white tables and patterned cloths.

2. Even light, no shadows on the page

   Daylight near a window works best. Under a ceiling light, stand to the side so your phone and hands don't cast a shadow on the paper. Skip the flash: it leaves a bright glare spot in the middle.

3. Get all four corners in, with a little room around them

   A cut-off corner can't be recovered later. Take extra care with stamps or signatures close to the edge.

4. Roughly face the page

   Perspective correction straightens a tilted shot, but at a steep angle the far side of the page goes soft. Aim for roughly straight on.

5. Check focus and send originals

   Zoom in to make sure small text is sharp. If photos go through a chat app first, send them as original files: many apps compress images and blur the text.

On iPhone: photos are saved as HEIC by default. If one won't open, go to Settings → Camera → Formats and choose Most Compatible, so new photos are saved as JPG.

3 steps from photos to a PDF

Step 1: Take or upload photos

Open paperly.unapod.com/app/ in any phone or computer browser. Tap Take a photo to shoot several pages in a row, or pick multiple JPG, PNG or WebP images at once. A document holds up to 30 pages, and each photo can be up to 30 MB. On a computer you can also drag photos onto the page.

Step 2: Check the crop and scan effect

Each photo is cropped, straightened and cleaned up automatically. Tap Compare to see the before and after.

• Edges are off: tap Crop and drag the four dots onto the corners of the paper, or nudge them with the arrow keys. If the edges are unclear, choose Whole photo.
• Wrong orientation: tap Rotate.
• Not happy with the look: switch the scan mode (see the next section) or fine-tune Paper cleanup, Contrast and Sharpness. Then tap Apply to all pages so you don't have to repeat it page by page.

Step 3: Order the pages and export

Drag pages in the sidebar to reorder them. Each photo becomes one page of the PDF. Before exporting, check three settings:

• Page size: for printing or submitting documents, choose A4 · auto orientation, so landscape pages become landscape A4. For archiving, Match image keeps the photo's proportions.
• Margin: choose 5 mm if you'll print, so the printer doesn't clip the edges. No margin is fine for on-screen use.
• Image quality: High (longest side 3200 px) suits printing and archiving. For websites with upload size limits, choose Standard (longest side 2400 px) for a smaller file.

Then tap Export PDF and the file is downloaded to your phone or computer.

Inside an in-app browser (for example WeChat): shooting and editing work normally. If nothing downloads when you export, open the page in your regular browser from the menu and export again.

Cost: 1 free export a day without an account, 3 a day after signing up, plus 3 full exports as a welcome gift. Free exports are up to 3 pages; longer documents use 1 credit for the whole PDF. Re-exporting the same document with different settings within 24 hours is not charged again. See pricing.

Which scan mode to choose

If you need a red stamp to stay red, don't use Black & white: it turns stamps gray.

Tips for contracts, receipts, IDs and homework

• Contracts and agreementsShoot the signature and stamp pages too, and use Document mode to keep stamps red. Include stamps that sit on the page edge in the crop. Export A4 with a 5 mm margin so the other side can print it at the original layout.
• Receipts and expense claimsPut receipts in the order of your expense form and merge them into one PDF. If thermal paper looks gray, raise Paper cleanup a little.
• IDs and certificatesShoot the front, then the back, and keep both in one PDF. If the card reflects light, change the angle or use True color.
• Tests and homeworkUse Black & white for plain text: clean pages and less ink. To keep red-pen marking, use Document mode.
• Handwritten notesIf pencil looks faint, raise Contrast a little.

Why "no upload" matters

Contracts, IDs, medical records and transcripts are sensitive, yet many online converters upload your photos to their servers before processing them.

Paperly's image processing is built on the open-source OpenCV library and runs inside your browser. Edge detection, correction, whitening and PDF creation happen on your device, and your photos and PDFs never pass through Paperly's servers. Paperly also doesn't use AI models to redraw text or stamps: what you export is your own photo, corrected. That matters when a document has to be submitted as it is.

Unexported drafts stay only in your current browser. They are cleared the next time you open the workspace after exporting, or after 24 hours if you never export.

How it compares with other options

Paperly doesn't do OCR yet. If you need a PDF with searchable, copyable text, an OCR tool is the better fit.

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