9 Best Free PDF Reader Apps for iPhone

You might have bought a new iPhone, updated your iOS version, or simply needed a better way to read and manage PDF files. There are plenty of free PDF reader apps available for iPhone, ranging from lightweight viewers to more complete tools for annotation, forms, conversion, and file management. Below, we've listed 9 of the best free PDF reader apps for iPhone and iOS in 2026.

9 Best PDF Reader Apps for iPhone in 2026

1. Adobe Acrobat Reader for iOS

Adobe developed and introduced the PDF file format to the general population, which meant that we had high hopes for its PDF application on iOS. A fairly remarkable application, Adobe Acrobat Reader makes it to our list of the best free PDF reader apps for iPhone.

In its free version, the application lets you search, scroll, and zoom in and out of your PDF files. Moreover, much like on its desktop counterpart, you can use sticky notes and drawing tools to comment on PDFs. These comments can then be interacted with or responded to by others.

Pros

• The annotation tools help you highlight or mark up certain areas of text.
• You can collaborate with others using comments and document-sharing features.
• Acrobat Reader also lets you create shareable links for documents.

Cons

• Features such as advanced PDF editing or exporting PDFs to Microsoft Office-compatible formats may require a subscription.

2. PDF Editor

Are you looking for a lightweight PDF reader for your iPhone? PDF Editor is designed for users who want a compact app for reading e-books and PDF documents. Its minimal interface fits well with iOS and keeps the reading experience relatively simple.

Despite its lightweight approach, it includes essential PDF tools. You can mark up pages, search for specific text in a document, and zoom in on paragraphs for easier reading.

Pros

• You can share PDF files through services such as iCloud and other supported apps.
• It can convert images directly to PDF format.
• PDF Editor also includes a dark mode for a more comfortable reading experience.

Cons

• Some advanced features, such as OCR, may require a paid subscription.

3. WPS Office

WPS Office is a popular productivity suite available on both Android and iOS. Instead of functioning only as a PDF reader, it combines document, spreadsheet, presentation, and PDF tools in a single mobile app.

The PDF features of WPS Office make it a useful option for users looking for a free PDF reader app for iPhone. It can work with files created in Microsoft Word, Excel, PowerPoint, and other formats, while also supporting PDF reading, bookmarks, annotations, and document conversion.

Pros

• You may not need a separate application if you already use WPS Office to manage documents and PDFs.
• The format-conversion tools make it more versatile than a basic PDF viewer.

Cons

• Users who only want a lightweight PDF reader may find the full office suite more complex than necessary.

4. PDF Office

PDF Office is another PDF application available for iPhone and iPad. In addition to offering a relatively clean interface, it provides a range of tools for opening and working with PDF documents.

PDF Office can work with different types of files and offers tools for converting, compressing, annotating, and managing PDFs. You can add text to a PDF, highlight or underline content, change annotation colors, and work with files stored in supported cloud services.

Pros

• PDF Office can work with files stored in cloud services such as iCloud, OneDrive, and Dropbox.
• You can use drawing tools to write or draw directly on PDFs.
• It includes tools for combining PDF documents.

Cons

• Some advanced conversion or document-management features may be more than basic PDF readers need.

5. Documents by Readdle

If you are looking for an all-in-one solution for managing files on iOS, Documents by Readdle is worth considering. It combines document management with PDF reading and other file-handling tools.

Although it is primarily a file-management application, it also works well as a PDF reader. You can read PDFs, search text inside documents, organize files, and use annotation tools for document review.

Pros

• You may not need a separate PDF viewing app if your main goal is to read and manage documents.
• PDF files and other documents can be organized together in one place.
• It is useful for users who work with PDFs alongside downloads, media, and other file types.

Cons

• Some advanced PDF editing features may require a subscription.

6. Foxit PDF Reader

Foxit PDF Reader earns a place on our list of the best PDF reader apps because of its relatively simple interface and broad set of everyday PDF tools. For many iPhone users, it covers common tasks such as opening PDF files, bookmarking documents, adding annotations and comments, and working with forms.

Foxit also includes features designed for users who regularly work with PDF files across different devices. Its reading and annotation tools make it useful for both casual document viewing and more active PDF review.

Pros

• You can share and access PDF files across supported devices and services.
• It supports scanning paper documents and working with PDF files.
• PDF forms can be filled out and saved through the app.

Cons

• Some advanced features require a paid plan or subscription.

7. Apple Books

Apple Books is one of the easiest ways to read PDFs on an iPhone because it is integrated into the Apple ecosystem. In addition to ebooks and audiobooks, Books can be used to save, organize, and read PDF files.

For users who mainly need a simple PDF reader, Apple Books can be enough. PDFs opened from Safari, Mail, or other apps can be saved for later reading, and built-in markup tools can handle basic annotations.

Pros

• It provides a simple way to read and organize PDFs on iPhone.
• Built-in markup tools support drawing and basic annotations.
• Because it is part of the Apple ecosystem, the interface feels familiar to iOS users.
• No separate third-party PDF reader is required for basic reading.

Cons

• It does not provide the advanced editing tools available in full PDF editors.
• It is better suited to reading than complex PDF document workflows.

8. PDF Expert

PDF Expert is a popular PDF application for Apple devices and is designed for users who want more than simple document viewing. It combines a smooth reading experience with annotation, document organization, and additional PDF tools.

You can use PDF Expert to read documents, create annotations, highlight text, add comments, draw on PDFs, and organize files. This makes it particularly useful for people who regularly review documents on an iPhone or iPad.

Pros

• PDF Expert lets you create bookmarks for frequently used pages.
• It supports syncing documents across supported devices and storage services.
• It includes annotation tools for document review.
• Its reading interface works well on Apple devices.

Cons

• Some editing, signing, and advanced PDF features may require a paid subscription.

9. PDF Reader

PDF Reader offers a combination of PDF viewing and document-management tools for iPhone and iPad. In addition to supporting common PDF files, it includes options for annotation, handwriting, document creation, and working with scanned content.

The application also includes OCR-related tools that can extract text from scanned images. Users can annotate documents with a finger or Apple Pencil on supported devices, making it useful for reading, studying, and reviewing PDF files.

Pros

• You can write on PDFs using your finger or Apple Pencil on supported devices.
• The app supports annotations and handwritten notes.
• You can work with signatures and scanned documents.
• It provides more document tools than a basic PDF viewer.

Cons

• Some additional reading and document-management features may require a subscription.

How to Choose the Best PDF Reader for iPhone

Not every iPhone user needs the same type of PDF app. If you mainly open attachments, ebooks, tickets, or reference documents, a lightweight or built-in PDF reader may be enough. If you regularly work with forms, annotations, signatures, or large collections of files, a more feature-rich PDF reader can make those tasks easier.

• For basic reading: Look for fast loading, search, bookmarks, and simple navigation.
• For annotations: Choose an app with highlighting, drawing, comments, and note-taking tools.
• For forms and signatures: Check whether these features are included for free or require an upgrade.
• For file management: Consider cloud-storage support and tools for organizing multiple documents.
• For advanced PDF work: Editing, OCR, conversion, and compression are usually found in broader PDF applications rather than simple readers.

FAQs about PDF Reader Apps for iPhone

Does iPhone have a built-in PDF reader?

Yes. You can open PDF files on an iPhone without installing a separate PDF reader. PDFs can be viewed from apps such as Files, Mail, Safari, and Apple Books. Built-in markup tools also allow you to perform basic annotation tasks.

What is the best free PDF reader for iPhone?

The best free PDF reader depends on what you need. Apple Books is a convenient option for basic reading, while Adobe Acrobat Reader and Foxit PDF Reader provide additional annotation and document tools. Users who need stronger document organization may prefer Documents by Readdle or PDF Expert.

Can I read a PDF on iPhone without downloading an app?

Yes. iOS can open PDFs directly through Files, Safari, Mail, and other supported apps. If you only need to read or lightly mark up a document, installing another PDF reader may not be necessary.

Which PDF reader is best for annotations on iPhone?

Adobe Acrobat Reader, Foxit PDF Reader, PDF Expert, and several other apps on this list provide highlighting, comments, drawing, and other annotation tools. The best choice depends on whether you also need features such as cloud storage, forms, signatures, or file management.

Are free PDF reader apps really free?

Many PDF reader apps offer free versions for basic document viewing and annotation. However, advanced functions such as PDF editing, OCR, conversion, compression, or additional cloud features may require an in-app purchase or subscription.

Conclusion: Which PDF Reader App for iPhone Should You Choose?

The best PDF reader for iPhone depends on how you use PDF files. If your main goal is simply to open and read documents, Apple Books and the built-in PDF support in iOS may already cover what you need. Adobe Acrobat Reader and Foxit PDF Reader are useful choices if you also want annotations, forms, or signatures.

For users who regularly organize and work with documents, PDF Expert and Documents by Readdle provide broader file-management and PDF tools. Whichever app you choose, check which features are included in the free version before downloading, since advanced editing, OCR, conversion, and other professional tools often require an upgrade.

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