Combining several images into one PDF: the complete guide (2026)
How do you turn invoices, contracts or holiday photos into a single PDF? I compared three approaches and recommend the browser-based image-to-PDF tool, with nothing to install.
Last week I helped a colleague with her expenses. She had 17 invoice screenshots on her phone and finance wanted "one PDF, in date order". My first instinct was to find a scanner — and then I realised that was completely unnecessary.
The three situations I hit
Expense invoices: several JPGs, and the order matters. Signed contracts: the other side sent five scanned pages that have to go back as one file. Schoolwork: the teacher asked for a PDF and the parents only have phone photos. All three come down to the same requirement: combine several images into one PDF, in order.
Three methods, all tried
Method 1: the built-in "Print → Save as PDF" on your phone iPhone and many Android phones can do it, but only one image at a time, so the order falls apart quickly and you cannot unify the page size.
Method 2: WPS / Adobe on the desktop Full-featured, but you have to download it, log in, and it occasionally nags about a subscription. Installing software on a work computer also means approvals, which I find tiresome.
Method 3: a browser tool (what I use now) Open the page, drop the images in, adjust the order, export. TwoThink's Images to PDF runs entirely in the browser and never uploads the file, which is exactly what I want when handling expense receipts.
Step by step (five minutes)
- Open the Images to PDF tool in Chrome or Edge.
- Drag the images into the upload area, or click to pick them. JPG, PNG and WebP are supported.
- Drag the list entries into the right order — do not skip this, the invoice dates depend on it.
- Pick a page size: A4 for printing, "original size" for purely digital archiving.
- Hit the button and the browser downloads a PDF. If your inputs are already PDF fragments, combine them with Merge PDF first.
[Image: the drag-to-reorder screen, annotated "hold and drag"]
Common questions
The order came out wrong? Just drag the list before you generate — much easier than splitting pages afterwards.
What if I need text inside the PDF? TwoThink does not do what-you-see-is-what-you-get text editing, but you can add the text to the images first, or use Watermark PDF to add an annotation.
The file is too big to send? Run the result through Compress PDF — the size usually halves, which makes sending it in a chat app painless.
Summary
For everyday office work, a browser tool is the least painful way to combine images into a PDF. Nothing to install, no sign-up, and sensitive invoices never leave your computer.
Try it now → open Images to PDF, drag in your first image, and see whether you have a result in 30 seconds.