How to Scan Documents With Your Phone and Make One PDF

To scan documents with your phone and turn them into one PDF: photograph each page flat and straight on in good light, crop each photo to the page edges, shrink the photos if the PDF needs to be small, then combine them in order with an image-to-PDF tool. ToolMany's Image to PDF puts each photo on its own A4 or Letter page in your browser, without uploading your documents.

Here's the workflow in detail, including the steps that make the difference between "readable" and "rejected".

What you need

• A phone with a camera. Any phone from the last few years is plenty.
• A flat, dark, non-shiny surface such as a table or a sheet of dark card. Contrast between page and background makes cropping easy.
• Daylight from a window, or bright, even room light.
• A browser on your phone or computer.

Step 1: Photograph each page properly

1. Lay the page flat. Smooth out folds; press curled receipts under the edges of a ruler.
2. Use even light. Stand so your body doesn't shadow the page. Turn the flash off, because it causes glare and a bright spot in the middle.
3. Hold the phone directly above the page, parallel to it, so the page appears as a rectangle rather than a trapezoid.
4. Fill most of the frame with the page, leaving a small border.
5. Tap to focus on the text, then take the photo. Check it's sharp by zooming in before you move on.
6. Photograph pages in order so they're already sorted in your gallery.

Many phones have a built-in document scanner that detects edges and straightens the page automatically. On iPhone it's in the Notes app (camera icon → Scan Documents) and in the Files app; on Android, Google Drive has a Scan button. If you use one of those, you can export straight to PDF, and the rest of this guide helps you merge, shrink and check the result.

Step 2: Crop and straighten

Crop each photo to the edges of the paper using your phone's Photos app (Edit → Crop). Rotate it so the text is upright. A tight crop:

• removes the table and your fingers from the final document,
• makes the text larger on the PDF page,
• reduces file size.

Step 3: Make the photos smaller (if needed)

Phone photos are often 3–5 MB each, so a 10-page document can easily exceed an email or portal limit. For document photos, about 1600 pixels on the long edge is plenty to read every word.

Use the Image Compressor: choose JPEG, scale down to around 40–50% for a typical 12-megapixel photo, and set quality around 75%. Check that the small print is still readable. Our guide to compressing a photo to a KB limit has more detail.

Step 4: Combine the photos into a PDF

1. Open Image to PDF.
2. Add the photos in page order. The PDF follows the order in which you add them, and there are no reorder controls in the list, so select page 1 first, then page 2, and so on. If you add them out of order, clear the list and start again.
3. Choose the page size:
   • A4 for most of the world, US Letter for the US and Canada. Each photo is scaled to fit the page with a small margin and centred.
   • Original size if you want each page to match the photo's own dimensions.
4. Name the file, for example Lease_Agreement_Signed.pdf, and create the PDF.
5. Open the PDF and check every page before sending: order, orientation and readability.

Step 5: Fix problems after the fact

• A page is sideways: use Rotate PDF to turn specific pages.
• You forgot a page: make a one-page PDF of the missing photo and insert it with Merge PDF.
• The PDF is still too big: go back to Step 3 with a smaller scale, or see how to get a PDF under an upload limit.
• You need the text, not just the image: run the photos through Image to Text (OCR) to copy the words out.

When phone scans are (and aren't) acceptable

Phone scans are accepted for most everyday purposes: insurance claims, expense reports, rental applications and many university or job portals. Some authorities, such as certain visa offices, courts and banks, ask for flatbed scans or certified copies. Check the instructions, and if a scan is rejected for quality, rescanning with a flatbed at 200–300 DPI usually solves it.

Privacy tips for scanned documents

Scanned documents often contain ID numbers, addresses and signatures:

• Use tools that process files on your device. ToolMany's image and PDF tools don't upload your files.
• Delete the original photos from your phone's gallery and its cloud backup if you no longer need them.
• Send sensitive PDFs through a secure channel, and consider password protection. See how to password protect a PDF.