Best PDF Apps for iPhone in 2026 — Read, Edit, Sign, and Scan

You probably don't need a dedicated PDF app on your iPhone. That's the honest starting point. Apple has quietly built solid PDF handling into iOS, and most people never discover it.

But if you do need more — annotation, form filling, proper document scanning — here's what's worth installing.

What iOS Does Natively (Before You Install Anything)

Since iOS 15, the built-in Files app handles PDF surprisingly well:

• Open and read any PDF
• Markup: highlight, draw, add text boxes, insert signatures
• Fill forms: tap text fields, check boxes, select dropdowns
• Scan documents: via the Notes app (Camera > Scan Documents)
• Sign: create and save signatures in Markup
• Share/print: standard iOS share sheet

For most people, this covers 80% of PDF tasks. The scanning in Notes is genuinely good — automatic edge detection, perspective correction, and multi-page scans combined into one PDF. Apple doesn't advertise this enough. What's missing natively: OCR on scanned documents, page reordering, merging multiple PDFs, advanced annotation tools, cloud sync for annotations.

1. Apple Files + Notes — Best for Most People

Price: Free (built into iOS) | Storage: iCloud

I'm listing this first because too many people install third-party apps without realizing what they already have. Open a PDF in Files, tap the Markup icon, and you've got highlighters, pens, text boxes, signatures, and shape tools.

The Notes scanner produces sharp, well-exposed document scans. For receipts, whiteboards, and one-page documents, it's all you need. Scans sync across all your Apple devices via iCloud.

Limitation: No way to merge PDFs, reorder pages, or run OCR. If you need those, read on.

2. Adobe Acrobat Reader — Best Free Third-Party Reader

Price: Free (reader), $12.99/month (Pro) | Size: ~250 MB

Adobe's free tier includes reading, commenting, filling forms, and one free "Liquid Mode" AI reflow per document. Liquid Mode reformats PDFs for phone screens — surprisingly useful for reading dense documents on a small screen.

The annotation tools are better than Apple's Markup: sticky notes, strikethrough, underline, drawing tools with pressure sensitivity, text commenting, and stamp tools.

What costs money: Editing text, combining files, exporting to Word/Excel, organizing pages. That's $12.99/month, which is steep for occasional use. The 250 MB app size is annoying. Adobe bundles their entire document cloud infrastructure into the app even if you just want to read PDFs. On a 64 GB iPhone, that's noticeable.

3. PDF Expert by Readdle — Best Paid PDF App

Price: $79.99/year | Size: ~150 MB

PDF Expert is the gold standard for serious PDF work on iOS. The interface is clean, fast, and doesn't feel like a desktop app crammed into a phone.

What you get:

• Inline text editing (actually modify the text in a PDF)
• Page management: reorder, delete, insert, rotate, extract
• Merge multiple PDFs
• Annotations with Apple Pencil support (iPad synced via Universal app)
• Form filling with auto-save
• File management with cloud service integration (Dropbox, Google Drive, OneDrive, iCloud)

The Apple Pencil annotation experience on the iPad version (same purchase) is the best available. Pressure-sensitive, minimal latency, palm rejection works flawlessly. Worth the price if you work with PDFs daily. Lawyers, academics, real estate agents — people who mark up documents as part of their job.

4. GoodNotes — Best for Annotation-Heavy Workflows

Price: Free (3 notebooks), $12.99/year (unlimited) | Size: ~180 MB

GoodNotes isn't a PDF app per se. It's a note-taking app that happens to handle PDFs beautifully. Import a PDF, and it becomes a notebook you can write on.

The handwriting search is the standout feature: write notes by hand, and GoodNotes indexes them so you can search your handwriting as text. For students annotating lecture slides or researchers marking up papers, this is transformative.

Not ideal for: PDF conversion, form filling, or sharing annotated PDFs with non-GoodNotes users. The export preserves your annotations, but the workflow is oriented toward personal notes rather than document exchange.

5. Microsoft OneDrive — Best for Office Integration

Price: Free (5 GB), Microsoft 365 ($6.99/month) | Size: ~200 MB

If you're in the Microsoft ecosystem, OneDrive's PDF handling is worth knowing about. Built-in document scanning, annotation, and direct integration with Word, Excel, and Teams.

The scanner is comparable to Apple Notes — auto-crop, multi-page, perspective correction. Scans save directly to OneDrive. The PDF reader supports basic annotation and form filling.

The real value: seamless round-trip with Office apps. Scan a document, OCR it, open in Word — all within the Microsoft ecosystem. For Microsoft 365 subscribers, this is already included.

Web-Based Alternative

For tasks none of these apps handle well — merging PDFs, converting formats, compressing files — MyPDF works in Safari on iPhone. No app to install, no storage consumed. Bookmark it and use it when you need to merge a few PDFs or compress a file for email.

My Setup

Apple Files for reading. Notes for scanning. MyPDF in Safari for merging and converting. That covers everything I need, and I haven't paid for a PDF app in years.

Related Tools

• Merge PDF — Combine PDFs on iPhone via Safari
• Compress PDF — Shrink files for email attachments
• Image to PDF — Turn photos into PDF documents
• PDF to Word — Convert PDFs to editable format