How to combine multiple photos into a single PDF, in the right order

The request is always some version of the same thing. A letting agent wants proof of address. A university wants your transcripts. An expenses system wants the receipts. An insurer wants photographs of the damage. In every case what you have is several images on a phone, and what they want is one file.

The combining itself is the easy part — every platform can do it and the browser method takes under a minute. What goes wrong is everything downstream: pages that arrive in an order nobody can follow, a set of photographs where half are sideways, and a finished PDF too large for the form to accept. This guide covers the mechanics on each platform, then the three problems that actually cause the resubmission.

Why one file matters more than it seems

It is tempting to attach six JPGs and consider the job done. It usually is not, for reasons that are mostly about the person on the other end:

• Most upload forms accept one attachment. This is the blunt reason. A portal with a single file field is not going to take your six images, and renaming them will not help.
• Separate files lose their order. Attachments arrive sorted by whatever the receiving system prefers, which is rarely the order you sent them. A three-page contract becomes a puzzle.
• Loose files get separated. One of six images gets missed when the reviewer downloads them, and the file is now incomplete without anyone noticing which piece is missing.
• A PDF prints as a document. Six images print as six pages at six different scales, depending on what each one's pixel dimensions happened to be. A PDF with a defined page size prints predictably.
• It reads as finished work. A single clean document says the sender took ten minutes. Six phone photos say otherwise, and reviewers do notice.

The method that works everywhere

Every device that can open this page can do this without installing anything, which is why it is the one method worth learning — it behaves identically on a phone, a work laptop and a borrowed computer.

Page order: the trap almost everyone hits

Nearly every built-in method on every operating system orders pages by filename, and filenames sort as text rather than as numbers. That produces this:

There are two ways round it. Either rename the files with zero-padded numbers — page01, page02, … page10 — so that text sorting and numeric sorting agree, or use a tool that lets you drag thumbnails into place and skip filenames altogether. The second is faster and it is why the browser method is worth the trip.

If a document has already been built in the wrong order, you do not need to start again: Organize PDF reorders, rotates and deletes individual pages in an existing file.

On an iPhone or iPad

iOS can produce a multi-page PDF from selected photos, though the route is undocumented and slightly strange. In Photos, tap Select, choose your images in the order you want them, tap the Share button and choose Print. On the print preview screen, pinch outwards on the page thumbnail. The preview opens as a PDF, which you can then share to Files, Mail or anywhere else.

It works, and it takes some finding. Two caveats: selection order is respected inconsistently across iOS versions, so verify the page order before sending, and there are no page size or margin controls at all — you get whatever the print dialog decides.

If the photos are of paper documents rather than of scenes, do not do this at all. Use the built-in document scanner instead, which corrects the perspective and lighting and writes a multi-page PDF directly — covered in how to scan documents with your phone. It is a substantially better result for the same effort.

On an Android phone

Android has no reliable built-in way to combine several existing gallery photos into one PDF. The Print → Save as PDF route handles a single image well and multiple images inconsistently, and the menu moves between Samsung, Xiaomi, OnePlus and Pixel builds, so instructions that work on one phone frequently do not on another.

Two dependable options. For photographs of paper, use Google Drive's built-in scanner — tap + → Scan, keep adding pages, then save — which produces one multi-page PDF and corrects the perspective while it is at it. For photographs of anything else, or images already in the gallery, the browser tool is the shortest path and gives you the ordering control Android does not.

On Windows and Mac

Both desktop systems can do this natively, and both have quirks worth knowing before you rely on them.

The macOS Preview sidebar method is genuinely good — it is the one native option on either platform that gives you real control over the order. The Windows print route is fine for a handful of images whose filenames already sort correctly, and frustrating otherwise.

Mixed orientations and inconsistent photos

A set of photographs taken over a week — some portrait, some landscape, some in daylight and some under a kitchen light — makes an ugly document even when every individual image is fine. Three fixes, in order of how much they help:

Mixed portrait and landscape

Forcing one orientation on all of them leaves the minority marooned in white space. Either convert in two batches — portrait images to portrait pages, landscape to landscape — and join the results with Merge PDF, or accept a single orientation and rotate the odd pages afterwards with Rotate PDF, which rotates them permanently rather than just changing how they display.

Pages that arrive sideways for no reason

This is EXIF orientation. The photo carries a rotation flag that your phone's gallery honours and the conversion did not, so the picture looks upright to you and lands rotated in the PDF. Set orientation explicitly during conversion, or fix the finished document with Rotate PDF.

Inconsistent lighting and framing

Nothing after the fact fixes this well. Photograph the whole set in one sitting, in the same light, from the same distance, square-on. Consistency reads as more competent than resolution does — a set of evenly lit, square-on photos at moderate quality looks far better as a document than a mix of angles and exposures at high resolution.

When you already have separate PDFs

A different job with a different tool. If each image has already been converted into its own PDF — or you have been sent several PDFs that should be one — use Merge PDF, which joins existing PDFs in the order you set without re-encoding anything. Nothing is re-compressed, so nothing loses quality.

The two tools are complementary and it is worth being clear which you need. Image to PDF takes pictures and produces a document. Merge PDF takes documents and produces one document. If you are holding a mix — some JPGs, some PDFs — convert the images first, then merge everything.

Keeping the finished file uploadable

This is where the whole exercise most often falls over. Modern phone cameras produce 4–8 MB per photograph, so ten photos becomes a 40–80 MB PDF: past Gmail's 25 MB attachment limit, past Outlook's 20 MB, and far past what most institutional upload forms accept.

Run the finished document through Compress PDF, which re-encodes the embedded images without disturbing the page structure or the order. Under 10 MB is a safe general target; under 5 MB for older government and university portals, which are routinely stricter than their own instructions state. If it still will not fit, Split PDF divides it into parts that can be sent separately.

You can also head the problem off before conversion by shrinking the images themselves — usually the better approach, since it avoids embedding 8 MB of pixel data you were only going to throw away. That trade-off is covered in how to reduce image size before PDF conversion.

One thing compression will not fix: if text in the photographs is unreadable at full zoom beforehand, it is unreadable afterwards. Rephotograph rather than compress. And if the text in the finished PDF needs to be searchable and selectable rather than just visible, run it through OCR PDF, which writes an invisible text layer beneath the images.

Frequently asked questions