How to merge PDF files on iPhone

Merging PDFs on iPhone is useful when related documents arrive as separate files but need to be sent, reviewed, or archived as one package. You might combine a signed agreement with supporting pages, put several receipts into one expense report, or join class handouts in reading order. A good merge keeps every source page while making the final document easier to name and share.

Ready to combine files? Open the private Merge PDF tool in Safari, or get ScanlyGo on the App Store for an iPhone-first document workflow.

This guide compares four approaches: the ScanlyGo iPhone app, ScanlyGo’s browser-based Merge PDF tool, Apple’s Preview app on iOS 26, and a reusable Shortcuts workflow. The right choice depends on your iOS version, whether you need page-level editing, how often you work with PDFs, and whether the documents can leave your device.

Before you merge PDF files

Start by saving the source PDFs somewhere you can find them, such as one folder in Files. Rename vague downloads like document-4.pdf before merging so the order is easier to understand. If the final document should begin with a cover letter, follow with a form, and end with evidence, decide that sequence before opening a tool.

Open each source once. Confirm that it is the correct document, that every expected page is present, and that the page orientation is readable. A merger joins what it receives; it does not know whether a missing signature page or duplicated receipt is intentional. Password-protected files also need attention. The ScanlyGo browser tool deliberately rejects encrypted PDFs, so remove the password using software you trust before selecting the file.

Think about advanced PDF features as well. Visible pages usually combine predictably, but interactive forms, bookmarks, embedded attachments, scripts, comments, and internal navigation are more complicated than page content. If those features are important, test the merged result in the reader your recipient will use and keep the original files.

Method 1: Merge PDFs in the ScanlyGo app

The ScanlyGo iPhone app is the most convenient option when merging is part of a recurring document workflow. It combines page-level editing with merge, scan, image conversion, organization, compression, protection, and sharing tools.

1. Open ScanlyGo and choose the PDF merge tool.
2. Import PDFs or images that should become pages.
3. Reorder individual pages and remove anything you do not need.
4. Scan additional pages during the merge, or add images and new pages.
5. Edit scanned, image, or newly created pages before inserting them.
6. Review the complete page order, create the PDF, then organize or share it.

Unlike the browser tool, which reorders complete source documents, the app lets you build the result page by page. You can start with existing PDFs, remove unwanted pages, insert edited images, and scan a missing signed page without abandoning the merge. This makes the app useful when the final document is not simply a whole-file combination.

The tradeoff is installation. If you need one quick merge, are working on a borrowed device, or want to use the same interface on iPhone and desktop, the browser tool may be the shorter route.

Method 2: Use the private browser Merge PDF tool

The free ScanlyGo Merge PDF tool runs in Safari and other modern browsers. It combines complete PDF documents locally in the browser. Selected files are not uploaded to ScanlyGo, Firebase, analytics, or a conversion server.

1. Open the Merge PDF tool.
2. Tap Select PDFs and choose up to 20 files.
3. Wait while the browser checks each file and counts its pages.
4. Use Move up and Move down to arrange the documents.
5. Remove anything you do not want in the result.
6. Tap Merge and download PDF.
7. Save scanlygo-merged.pdf to Files or share it from the browser’s download controls.

The tool accepts up to 50 MB and 200 pages combined. It validates actual PDF content rather than trusting only a filename. Valid files can still be accepted when another selected file is empty, damaged, unsupported, or encrypted, and the page count shown beside each accepted file helps you catch an unexpected source.

This method merges complete documents in the displayed order. It does not select, delete, or rearrange individual pages inside a source PDF. Page dimensions, portrait or landscape orientation, rotation, and visible content are retained, but advanced features such as interactive forms, bookmarks, attachments, scripts, and document navigation are not guaranteed to remain functional.

The browser must load the PDF engine after you select files, so the first validation can take a moment on a slow connection. Once loaded, document reading and merging happen on the device. Large files can still challenge mobile memory even when they fit within the stated limits, so close unused tabs if Safari is under pressure.

Method 3: Insert PDFs with Apple Preview on iOS 26

On iOS 26, Apple’s built-in Preview app provides a page-level way to combine documents. Apple documents an Insert from File command that can add a PDF or image after a selected page, and page thumbnails can be dragged into a different order. This is useful when you need individual-page control rather than whole-document ordering.

1. Open the first PDF in Preview.
2. Tap the page count to show page thumbnails.
3. Touch and hold the thumbnail after which the next document should appear.
4. Choose Insert from File.
5. Select the next PDF from Files.
6. Repeat for other documents.
7. Drag thumbnails if individual pages need a different order.
8. Save or share the edited PDF.

See Apple’s current Preview instructions for adding and moving PDF pages because labels and availability depend on the installed iOS version.

Preview is a strong built-in choice when page insertion, deletion, rotation, or reordering matters. It is less direct for a simple batch of many complete documents because you insert files into an open PDF one at a time. Keeping an untouched copy is sensible, especially when editing a form or another document with advanced features.

If your iPhone does not have the Preview app, it may be running an earlier iOS release. Files and Quick Look can open and share PDFs, but older versions do not offer the same straightforward built-in insertion workflow. In that situation, use the browser tool, ScanlyGo, or a Shortcut you have tested.

Method 4: Build a reusable Shortcuts workflow

Apple’s Shortcuts app can automate repeated file tasks. A custom shortcut can ask for files, transform compatible input into a PDF workflow, and save or share the result. This approach is most useful when you repeatedly combine the same kind of material and are comfortable reviewing how each action passes content to the next.

A typical structure starts with a file-selection action, limits input to PDFs, combines or converts the selected documents using the PDF actions available on your iOS version, then saves the result to Files. Enable the shortcut in the Share Sheet if you want to launch it from Files. Action names and accepted input types can change, so open an action’s information panel and test the shortcut with disposable documents before trusting it with important files.

Shortcuts offers flexibility but requires setup and maintenance. Ordering can depend on how files are selected or sorted, and an automation can produce an unexpected result if an action changes behavior. It is a better fit for repeatable routines than for someone who wants visible validation and reorder buttons immediately.

Which iPhone PDF merge method should you choose?

Choose ScanlyGo when you want page-level ordering and removal, edited image pages, or the ability to scan new pages during a merge. Choose the browser merger when you want a quick, private, cross-device workflow with clear whole-document ordering and no installation. Choose Preview on iOS 26 for built-in page insertion and rearrangement. Choose Shortcuts when the same automated sequence will save time repeatedly.

For sensitive paperwork, consider both processing and the destination. ScanlyGo’s browser tool reads document contents locally, but saving the finished PDF to a cloud folder or sending it through email is a separate action that may upload it to that service. Use On My iPhone or another destination that fits your privacy requirements.

Check the merged PDF before sharing

Open the finished file and review it from beginning to end. Confirm the page count, document order, page rotation, signatures, and readability. Test form fields, bookmarks, or attachments if you expect them to work. Rename the result so a recipient can identify it, but avoid confidential details in a filename that may appear in email subjects, download histories, or shared folders.

Keep the original PDFs until the merged copy has been accepted. A combined document is convenient for delivery, but the separate sources are easier to replace or reorder when something changes. If you need to turn photos into an additional source first, follow the image-to-PDF guide, then return to the private Merge PDF tool to combine everything.