How to Edit a PDF on iPhone — Complete Guide (2025)

You can do a lot more to a PDF on your iPhone than most people realize. Merge files, split pages, compress for email, fix rotation, add a password, remove a password, reorder pages, delete pages, convert to images — all without a desktop, all on your iPhone.

This guide covers everything: what iOS can do natively for free, and where a dedicated app like PDFlow fills the gaps — without a subscription.

PDFlow is a one-time purchase. No monthly fee. No account. Works offline. Download on the App Store →

What Can You Edit in a PDF on iPhone?
What iOS Can Do for Free (Built-In Tools)
The Full PDF Toolkit — PDFlow
PDF Editing Tasks — Quick Reference
Frequently Asked Questions
PDFlow vs. the Subscription Apps

What Can You Edit in a PDF on iPhone?

"Editing a PDF" means different things depending on what you need. There are two distinct categories:

1. Content Editing — Change the Text and Images Inside

Modifying the actual words, fonts, and embedded images in a PDF. This requires OCR (Optical Character Recognition) for scanned PDFs and is a complex operation. Most mobile apps — including PDFlow — do not offer this, and the ones that do charge premium subscription prices.

If you need to change the text inside a PDF on iPhone: The most reliable approach is to find the original source document (Word, Google Doc, etc.), edit it there, and re-export as PDF.

2. Page and File Editing — Work With the Structure

Everything else: reorganizing pages, combining files, reducing size, fixing orientation, securing with a password, extracting pages as images. This is what most people actually need when they say "edit a PDF" — and PDFlow handles all of it.

This guide focuses on page and file editing — the practical, daily PDF tasks you need done on your iPhone.

What iOS Can Do for Free (Built-In Tools)

Apple has added meaningful PDF tools to iOS over the years. Before reaching for a third-party app, here's what you can do for free:

Markup and Annotation (iOS Files + Markup)

Add text boxes, signatures, and drawings
Highlight, underline, or strikethrough text
Draw freehand with Apple Pencil or finger
Add shapes and arrows

How: Open a PDF in Files → tap the pen icon (Markup) → use the toolbar.

Rotate Pages (iOS 16+)

Rotate individual PDF pages 90° left or right
Changes save to the file permanently

How: Open PDF in Files → tap page indicator → long press thumbnail → tap Rotate.

Delete Pages (iOS 16+)

Remove individual pages from a PDF
Changes overwrite the original file

How: Open PDF in Files → tap page indicator → long press thumbnail → tap Delete.

Reorder Pages (iOS 16+)

Drag pages into a new order
Works via the horizontal thumbnail strip

How: Open PDF in Files → tap page indicator → long press and drag thumbnails.

Merge PDFs (iOS 16+)

Combine multiple PDFs via the Files app
Merges in alphabetical order — cannot reorder before merging

How: Files app → Select multiple PDFs → three-dot menu → Create PDF.

Lock PDF with Password (iOS 16+)

Add a password to locally stored PDFs
Does not work on iCloud Drive files

How: Open PDF in Files → tap arrow next to filename → Lock PDF.

Basic Compression (iOS 15+)

Reduce file size via the Export menu
Limited control — no labeled compression levels

How: Open PDF → Share → Export as PDF → adjust quality slider.

Split / Extract Pages (Workaround)

Use the Print dialog to save a page range as a new PDF
Contiguous ranges only — no page-by-page selection

How: Open PDF → Share → Print → enter page range → pinch to expand preview → Share → Save to Files.

The honest assessment: iOS built-in tools cover the basics for simple, one-at-a-time tasks on short documents. They become limited quickly: no grid view, overwrites originals, no multi-select, iCloud restrictions on passwords, no compression levels, no batch operations. For regular PDF work, you need a dedicated tool.

The Full PDF Toolkit — PDFlow

PDFlow is a complete PDF editor for iPhone built around nine tools. One-time purchase, works offline, never overwrites your originals.

Merge — Combine PDFs

Combine two or more PDFs into one. Import from Files, Google Drive, or Share Sheet. Drag to reorder before merging. No alphabetical-order constraint. → Full guide: How to Merge PDFs on iPhone

Split — Extract Pages

Extract a page range or individual pages from a PDF into new files. Visual thumbnail grid. Multiple output files in one session. → Full guide: How to Split a PDF on iPhone

Compress — Reduce File Size

Three labeled compression levels (Low / Medium / High) with estimated output size. Cuts scanned PDFs by 40–70%. Process on-device, nothing uploaded. → Full guide: How to Compress a PDF on iPhone

Reorder — Rearrange Pages

Full thumbnail grid. Drag any page to any position. Fix scrambled documents or reorder after merging. → Full guide: How to Reorder PDF Pages on iPhone

Remove Pages — Delete Pages

Tap to select one or many pages, delete in a single action. Multi-select is significantly faster than iOS's one-at-a-time method. → Full guide: How to Delete Pages from a PDF on iPhone

Rotate — Fix Page Orientation

Permanently rotates pages into the PDF file structure — not just the view. Rotate right, left, or 180°. Multi-page selection. → Full guide: How to Rotate a PDF on iPhone

Protect — Add a Password

AES encryption. Works with any PDF from any source — including iCloud Drive and Google Drive, unlike the iOS built-in tool. → Full guide: How to Password Protect a PDF on iPhone

Unlock — Remove a Password

Remove password protection from any PDF you own. Works on user passwords and owner restrictions. Nothing uploaded to any server. → Full guide: How to Unlock a PDF on iPhone

To Images — Convert Pages to JPG or PNG

Converts every PDF page to an individual image file. Choose JPG (smaller, great for sharing) or PNG (lossless, best for text). All pages processed at once. → Full guide: How to Convert PDF to Images on iPhone

Download PDFlow on the App Store →

PDF Editing Tasks — Quick Reference

Use this table to find the right tool for any PDF task on iPhone:

Task	Free (iOS Built-In)	PDFlow
Annotate / highlight	Yes — Markup tool	—
Merge PDFs	Yes — alphabetical order only	Yes — reorderable
Split / extract pages	Workaround only (Print trick)	Yes — full control
Compress / reduce size	Basic slider	Yes — 3 levels + size preview
Reorder pages	Yes — horizontal strip	Yes — full grid
Delete pages	Yes — one at a time	Yes — multi-select
Rotate pages	Yes — one at a time	Yes — multi-select + 180°
Password protect	Yes — local files only	Yes — any source
Remove password	No	Yes
Convert to images	No (screenshots only)	Yes — JPG or PNG
Works with Google Drive	No	Yes
Keeps original file	No — overwrites	Yes — always

Frequently Asked Questions

Can I edit PDF text on iPhone for free?

Modifying the actual text inside a PDF (changing words, fonts, paragraphs) is complex and not available in free iOS tools. Apple's Markup tool lets you add text boxes on top of a PDF but does not edit existing text. Apps like PDF Expert offer text editing behind a subscription. The most reliable free approach is to edit the original source document and re-export as PDF.

What is the best free PDF app for iPhone?

For page-level operations (merge, split, compress, reorder, rotate, protect), PDFlow is the best value — one-time purchase, no subscription. For annotation and markup only, Apple's built-in Markup tool in the Files app is completely free and capable.

Does iPhone have a built-in PDF editor?

Yes, partially. iOS 16 includes tools for rotation, page deletion, page reordering, basic merging, basic compression, and password protection — all built into the Files app. The limitations are: no multi-select, overwrites originals, iCloud Drive password restrictions, no compression level control, and no PDF-to-image conversion.

How do I edit a PDF on iPhone without an app?

Use the built-in iOS tools: open any PDF in the Files app, tap the page indicator to access the thumbnail strip, and use long-press menus to rotate, delete, or reorder pages. For merging, select multiple PDFs in Files and tap Create PDF. For splitting, use the Print dialog page range workaround. For annotation, use the Markup pen icon.

Is PDFlow a one-time purchase or subscription?

PDFlow is a one-time purchase. You pay once and own the app permanently — no monthly or annual fee, no features locked behind a subscription tier. This is the core difference between PDFlow and Adobe Acrobat or PDF Expert.

Does PDFlow work offline?

Yes. Every tool in PDFlow processes files entirely on your iPhone. No internet connection is required, and no files are ever uploaded to any server. This matters especially for sensitive documents like bank statements, contracts, and tax forms.

Can I use PDFlow on iPad?

Yes. PDFlow runs natively on both iPhone and iPad, and takes advantage of the larger screen on iPad for the thumbnail grid views in tools like Reorder, Remove Pages, and Rotate.

PDFlow vs. the Subscription Apps

	PDFlow	Adobe Acrobat	PDF Expert
Price	One-time purchase	$9.99/month	$79.99/year
Merge	Yes	Yes	Yes
Split	Yes	Yes	Yes
Compress	Yes	Yes	Yes
Reorder	Yes	Yes	Yes
Remove pages	Yes	Yes	Yes
Rotate	Yes	Yes	Yes
Protect	Yes	Yes	Yes
Unlock	Yes	Yes	Yes
To Images	Yes	Yes (Pro)	Yes
Edit PDF text	No	Yes (Pro)	Yes
Offline	Yes	Limited	Yes
Files uploaded to server	Never	Sometimes	No

Bottom line: If you need to change the text inside PDFs, PDF Expert or Adobe Acrobat are the tools — at subscription prices. If you need to work with PDF pages and files — merge, split, compress, organize, secure — PDFlow does everything at a one-time price.