PDF Opening Issues

Fix Adobe Acrobat Not Displaying Letters in PDFs on iOS

Amos Gikunda Oct 19, 2026 868 views

Question details

The user is experiencing an issue where specific letters are missing when reading certain PDF books on an iOS device.

How to Fix Adobe Acrobat Not Displaying Letters in PDFs on iOS

Product: Adobe Acrobat Reader for iOS
Device & OS: iOS
Scenario: Reading downloaded PDF books containing specific embedded fonts on a mobile iPhone or iPad.
Observed behavior: Some letters are invisible or fail to render in Adobe Acrobat Reader, even though the same PDF files display perfectly in desktop applications or Apple Books.

Before you start

Ensure that your PDF file is completely downloaded and saved locally on your iOS device's internal storage, as reading directly from a cloud sync folder can sometimes cause rendering interruptions.

Solution 1Recommended

Test PDF on Desktop and Update iOS App

Determine if the missing text is a device-specific glitch by testing on a computer, then update your iOS software to fix potential font rendering bugs.

Transfer the PDF

Send or transfer the problematic PDF file from your iOS device to a Mac or Windows PC.

Open on Desktop

Open the file using a desktop PDF reader such as Adobe Acrobat or Adobe Digital Editions to check if all letters display correctly.

Update the Mobile App

If the text is fully visible on the desktop, open the App Store on your iOS device and update Adobe Acrobat Reader to the latest version.

Update iOS

Navigate to Settings > General > Software Update on your iPhone or iPad, and install any pending iOS updates to ensure optimal font support.

Solution 2

Use Alternative PDF Readers on iOS

If Acrobat Reader struggles with embedded fonts, switching to another capable PDF application can immediately bypass the missing text issue.

Seamless PDF Reading

Read and Annotate PDFs flawlessly on iOS with WPS Office

Bypass Adobe Acrobat font rendering errors and missing text by using WPS Office's built-in PDF reader. It provides robust support for all PDF standards and complex embedded fonts, ensuring your documents are rendered perfectly on your iPhone or iPad.

1. Download the App: Search for and download the free WPS Office app from the Apple App Store onto your iPhone or iPad.
2. Import Your PDF: Launch WPS Office, go to the 'Files' tab, and navigate to the local folder or cloud drive where your PDF book is stored.
3. Open and Read: Tap the PDF document to open it. WPS Office's advanced PDF engine will load the file natively, correctly displaying all fonts and previously missing letters.

Accurate font rendering for standard and complex embedded PDF fonts.High compatibility with Microsoft Office and Adobe PDF formats.Free and lightweight all-in-one mobile office suite.Includes comprehensive tools for reading, annotating, and editing PDFs on the go.

microsoft office alternative - wps office

Frequently Asked Questions

Why do some letters disappear in PDF files on my iPhone?

This typically occurs when a PDF contains custom or non-standard fonts that the specific mobile PDF reader app cannot render correctly, or when there is a bug in how the application handles embedded font subsets.

How can I fix embedded font issues in mobile PDF readers?

You can resolve these issues by updating the PDF reader app to the newest version, ensuring your device's operating system is fully updated, or simply opening the document in an alternative app that features better font rendering support.

Are there free alternatives to Adobe Acrobat for reading PDFs on iOS?

Yes, iOS users have multiple free alternatives, including the built-in Apple Books app or comprehensive office suites like WPS Office, which include powerful PDF viewing and editing capabilities.

PDF Troubleshooting