How to combine multiple photos into one PDF

Landlords, schools, employers, insurers and government offices often ask for “a single PDF”. You have six photos of a document on your phone. This guide shows how to turn them into one tidy, readable PDF in the right order, without installing an app or uploading private documents to a website.

Why one PDF instead of several photos?

A PDF keeps pages together in order, looks the same on every device, prints at a sensible size, and is a single attachment. Many upload forms accept only one file per field, and a reviewer is far more likely to read a neat 4-page PDF than to open four separate photos.

Step 1: take good photos

The PDF can only be as readable as the photos you put in it. A few habits make a big difference:

• Use daylight or bright, even light. Avoid your own shadow falling across the page.
• Shoot straight on. Hold the phone parallel to the page so text isn’t skewed.
• Fill the frame. Get close enough that the page fills most of the photo, with a little margin on every side.
• Use a dark, plain background behind white paper so the edges are clear.
• Check focus. Tap on the text before taking the photo and zoom in afterwards to make sure it’s sharp.

Many phones also have a built-in document scanner (in the Notes app on iPhone, or Google Drive’s scan feature on Android) that straightens and crops pages automatically. Those scans work perfectly as input here.

Step 2: add the photos

Open JPG to PDF and add your images. Despite the name, it accepts JPG, PNG, WebP and iPhone HEIC photos, and you can mix them in one PDF. Each image becomes one page.

On a computer, drag the files onto the converter. On a phone, tap Choose images and select them from your photo library. The photos are prepared on your device as they’re added; nothing is uploaded.

Step 3: put the pages in order

The order of the file list is the order of the pages. To change it:

• On a computer: drag a row up or down.
• On a phone or with a keyboard: use the up and down arrow buttons on each row.

Tip: if you name or take your photos in order (page 1 first), they usually arrive in the right order already.

Step 4: choose page size, orientation and margin

The defaults work for most people, but here’s what each option does:

Page size

• Fit to image: each page is exactly the size of its photo. Best for viewing on screen and for receipts of different shapes.
• A4: the standard paper size in most of the world. Choose this if the PDF may be printed outside the US and Canada.
• US Letter: standard in the US and Canada.

Orientation (for A4 and Letter)

• Automatic turns landscape photos into landscape pages and portrait photos into portrait pages.
• Portrait or Landscape forces every page one way.

Margin

• None puts the image edge to edge.
• Small or Large adds white space around each image, which looks tidier when printed and stops printers from cutting off edges.

For documents that will be printed, A4 or Letter with a small margin is the safest choice.

Step 5: create and download

Press Create PDF. A moment later you’ll see the file name, page count and size, with a Download PDF button.

Need separate PDFs instead, for example one per receipt? Choose One PDF per image under Output before creating. You can download them individually or all together as a ZIP.

Keeping the PDF small enough to send

Phone photos are large, so a PDF of ten photos can easily be 20–40 MB. Many email services and upload forms set limits around 2–25 MB.

If your PDF is too big:

1. Resize the photos first. For documents, about 1600–2000 pixels on the long side is plenty for readable text. Use Resize image on the whole batch.
2. Compress them. Run the resized photos through Compress image at around 70–75% quality.
3. Create the PDF again from the smaller images.

If a single page must be under a particular size, Compress to 100 KB can hit an exact limit per image.

Screenshots and PNG scans are embedded losslessly, which keeps text crisp but can make larger files. If size matters more than perfect sharpness, convert them to JPG first with PNG to JPG.

Privacy: why it matters for documents

The documents people combine into PDFs are often sensitive: IDs, bank statements, medical letters, contracts, tax forms. Many online PDF tools upload your files to their servers to process them, and you’re trusting them to delete the copies.

OneDropConvert builds the PDF inside your browser using the open-source pdf-lib library. Your photos never leave your device, and the images placed in the PDF don’t carry location data.

Troubleshooting

Pages are sideways. Phones store rotation as a tag. We apply it automatically, so pages should be upright. If a photo was genuinely taken sideways, rotate it in your phone’s editor and add it again.

Text is hard to read. The original photo was too small, blurry or dark. Retake it in better light, closer to the page.

The PDF won’t open on an old device. Very rarely, older readers struggle with large images. Resize the photos to around 2000 px and create the PDF again.

The order is wrong. Rearrange the list and press Create PDF again; the PDF is rebuilt in the new order.

The short version

Take clear, straight photos, add them to JPG to PDF, arrange the order, pick A4 or Letter with a small margin for printing (or Fit to image for screens), and create the PDF. If it’s too big, resize and compress the photos first. Everything happens on your device, so your documents stay private.