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Turning phone photos into one clean, readable PDF

The Yeti team4 min read

An ID copy, a receipt, a signed page: how to turn photos taken with your phone into one straight, legible PDF of a sensible size.

A copy of both sides of your ID, three pages of an invoice, a form you need to sign and send back. No scanner, but there's a phone in your pocket. The hard part usually isn't taking the photos. It's what you end up with: a crooked, shadowy file, 4 MB a page, with the pages in the wrong order.

Here's a practical way to turn photos taken with your phone into one PDF that's straight, legible and a sensible size.

Two routes: scan with the camera, or combine existing photos

  • If you're about to photograph the document, use Scan Document. It opens your phone's camera inside the browser, adds each page to a list as you shoot, and turns them all into one PDF at the end. The black-and-white filter makes the text stand out.
  • If the photos are already in your gallery, pick them in JPG to PDF, put them in order and convert. JPG, PNG and WebP files are accepted.

Both run in your phone's browser, with nothing to install, and your photos aren't uploaded to any server. That matters a lot when what you're scanning is an ID or a medical document.

Five rules for a good photo

Software can fix a lot, but not a badly taken photo. Before you shoot:

  1. Light. Next to a window in daylight is best. Flash leaves a white glare on glossy paper; turn it off.
  2. Shadows. Keep the shadow of your phone and hand off the page. Have the light to your side, not behind you.
  3. Background. Put white paper on a dark table. The contrast makes the page edges clear.
  4. Angle. Hold the phone parallel to the paper and shoot straight down. On a page shot at an angle, the top lines look smaller than the bottom ones.
  5. Framing. Let the page fill the screen as much as possible without cutting off the edges.

After each shot, zoom in and make sure the smallest text is readable. If it's blurry, retaking it is quicker than fixing it later.

Order, orientation and page size

  • Set the order before you create the PDF. In both tools you can drag the thumbnails around. For two-sided documents, put the front first.
  • Rotate sideways photos. Each page in Scan Document has a rotate button. If you only notice after the PDF is made, Rotate PDF fixes it.
  • Page size: choosing A4 or Letter centers the photo on a paper-sized page, which suits documents that will be printed. Fitting the page to the photo keeps the photo's own proportions and looks cleaner on screen.

File size: why is it 30 MB?

Modern phones take 12-megapixel photos or bigger, and one of those can be 3-4 MB on its own. A ten-page document easily reaches 30-40 MB: too big for email, too big for most upload forms.

The fix is simple:

  • The black-and-white filter improves legibility and cuts the size considerably.
  • After creating the PDF, run Compress PDF at the recommended level. Text-heavy scans often drop below half their size.
  • If the document is black and white anyway, also switch on the grayscale option in the compressor.

There's more in our guide to reducing PDF file size.

iPhone photos and HEIC

iPhones store photos as HEIC by default. When you pick photos for a website in Safari, iOS usually converts them to JPG on the fly. If you run into a case where it doesn't, go to Settings > Camera > Formats on the iPhone and choose "Most Compatible"; photos you take from then on are saved as JPG.

A small precaution when sending ID copies

If you're sending a photo of an ID card, passport or driving license to an organization, writing what it's for across the document makes it harder to reuse for something else. For example: "Only for the ABC Bank loan application, 2 November 2026". Add Watermark can put that text across the whole page, semi-transparent. Light enough that the details stay readable, spread out enough that it's hard to remove.

Searching a scanned PDF

The text in a PDF made from photos is really part of a picture: you can't search it or copy it. If you need to, run OCR PDF as the last step. The page looks the same, but a searchable text layer is added behind it. The photo rules above matter for OCR too: the straighter and sharper the page, the better the result.

In short

  1. Light from the side, flash off, phone parallel to the paper.
  2. Shoot with Scan Document, or combine gallery photos with JPG to PDF.
  3. Fix the order and orientation before creating the PDF.
  4. Use the black-and-white filter and compression to get the size down.
  5. Watermark ID copies with what they're for.