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How to combine several phone photos into one PDF

You photograph a receipt, a contract you signed on paper, your ID or some notes with your phone, and end up with several loose photos in your gallery. The problem shows up when you have to hand them over: send 5 photos by email or WhatsApp and the order can get scrambled, each image carries its own weight, and whoever receives them has to open each one separately. What you almost always need, instead of loose photos, is a single PDF with every page in order.

It comes up mostly in these situations:

• Saving receipts for bookkeeping or an expense reimbursement.
• Sending a contract that was signed on paper and photographed with a phone.
• Uploading an ID, passport or supporting document to an online form.
• Turning notebook pages into a clean digital copy.

The manual trick: your phone's scanning app

For a one-off document, the fastest option is already in your pocket. Apps like Notes (iPhone), Google Drive or Adobe Scan have a "scan document" feature that takes photos in sequence and stitches them into a PDF right there on the phone. It works perfectly if you're the only one who needs to do it, once, with photos you're taking right now.

The limit shows up when you didn't just take the photos yourself: a client sent them over WhatsApp, they were already saved from before, or you need to build the PDF automatically every time someone uploads photos to a form. No scanning app helps there, because there's nothing to scan: you need a service that takes images that already exist and combines them into a PDF for you.

Combining photos you already have, automatically

That's what Image(s) to PDF does: send it between 1 and 20 photos in PNG or JPEG format and it returns a single PDF with one photo per page, in the same order you sent them. Nothing to install, no need to open your phone: it's a call you can trigger from an n8n, Make or Zapier flow, for example whenever an email arrives with photos attached or someone uploads images through a form.

The photos are sent encoded inside a JSON body, not as raw files (since there are several at once, no other way to send them fits), and the whole request has a 6 MB cap, which in practice means around 4 MB of actual combined photos. By default it returns the PDF encoded inside the JSON response; if you'd rather get the file directly, you can request the binary output format instead.

Which page size to choose

By default, with automatic sizing, every page comes out at the exact pixel size of its matching photo, with no cropping or stretching, the most faithful option if you just want the photos joined as they are. If instead you need a document that looks "official," with standard-sized pages for printing or filing, you can request A4, A3, A5, Letter, Legal or Tabloid: the photo gets centered inside that page, still without any stretching.

FAQ

Can I mix JPEG and PNG photos in the same PDF? Yes. Both formats are supported equally and you can combine them in the same document without any issue.

How much does converting several photos cost? 1 credit per PDF, whether you use 1 photo or the maximum of 20. The price doesn't depend on the number of images.

What if my photos are too heavy? The limit is 6 MB for the whole request (around 4 MB of actual photos). If you go over it, reduce the size or quality of the photos before sending them, or split them across two PDFs.

What order do the pages come out in? The same order you send the images in the request.

Try these tools

You'll find the full documentation for Image(s) to PDF, with examples for n8n, Make and your own code. And if you don't have an account yet, you can create one for free.