PDFs are the format nobody loves and everybody has to deal with. On iPhone, the good news is that you can open one, scroll it, sign it, and send it back without installing anything. The bad news is that the moment you need to edit text, combine two files, or fill in a form that is not a proper form field, the built-in tools run out of road fast.
This is one of the few categories where the third-party apps are not padding. Reading and signing are solved by the system. Editing the actual contents of a PDF, or managing a library of them, is not.
There is also a middle ground that most people miss: the small jobs. Merging three PDFs, splitting one in half, reordering pages. Those do not need a subscription or an account, and they are increasingly handled well in a browser, on your own machine. This post covers the built-in tools honestly, the two apps that do the heavy work — PDF Expert and Adobe Acrobat — and the lighter path for one-off jobs.
Files covers more than people expect
Tap a PDF in the Files app and you get a preview with a toolbar that does real work:
- Markup, with a pen, highlighter, text boxes, and a signature you can save and reuse
- Rotate and rearrange pages by dragging them in the thumbnail sidebar
- Fill in form fields on any PDF that has proper interactive fields
- Scan a signature with the camera, if drawing one with a finger looks as bad as it usually does
For a contract that needs initials on four pages, this is a two-minute job and no app is faster.
What Files cannot do: edit existing text, delete a paragraph, replace an image, add real bookmarks, compress a file, or handle a hundred PDFs as a library. It also has no OCR, so a scanned PDF stays an image of words forever.
A nicer place to read long documents
The Books app opens PDFs and is a more comfortable place to actually read one: adjustable brightness, a proper page-turn, bookmarks, and a library view that remembers where you were. Import a PDF into Books and it syncs across devices through iCloud.
It is a reader, not an editor. No markup beyond basic highlights and notes, no page management. But if the PDF is something to read rather than something to sign, Books is the nicer surface for it.
PDF Expert is the closest thing to a desktop PDF app
PDF Expert from Readdle is the app people reach for when they need to change the document rather than annotate it. It edits text directly in the PDF, swaps images, fills and flattens forms, and handles large files without the stuttering that plagues lighter viewers.
It also has the organizational layer that Files lacks: a real file browser, tags, and search across your documents. For anyone who deals with contracts, invoices, or academic papers regularly, that is the part that earns the subscription.
Two honest caveats. The important features are behind a subscription, and the free tier is more of a demo than a tool. And it is a lot of app for someone who signs two PDFs a year.
Adobe Acrobat is the compatibility answer
The Adobe Acrobat Reader app is free and reads everything, including the awkward PDFs that other viewers render with missing fonts or broken layouts. Adobe's format, Adobe's reader, fewest surprises.
Editing, converting, combining, and OCR are behind an Acrobat subscription, and the app is heavy, account-bound, and pushes its paid tier at every turn. Worth it if your workplace already pays for Acrobat. Otherwise it is a lot of friction for a viewer.
Merging PDFs without uploading them
Combining files is the job people most often hand to a random website, which means uploading a contract to a server they know nothing about. BrowserStay's merge PDF tool does it in the browser instead: you add the files, drag them into order, see a live preview with page counts, and download the result. Nothing is uploaded, there is no account, and it is free.
The trade-off is that it is a single-purpose tool in a browser tab. It merges and orders pages; it does not edit, fill, or sign. Very large files are also bounded by how much memory your phone has. For the actual job of gluing three PDFs together before emailing them, that is the right amount of tool.
The short version
- Read a PDF: Books
- Sign or annotate one: Files
- Edit text, manage a library: PDF Expert
- Maximum compatibility: Acrobat Reader
- Merge or reorder pages once: the browser tool
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