Other PDF Issues

How to Fix Slow or Crashing Acrobat Reader on iPhone

Nimra Malik Oct 19, 2026 868 views

Question details

The user experiences slow performance, freezing, or crashing when using Adobe Acrobat Reader on an iPhone.

How to Fix Slow or Crashing Acrobat Reader on iPhone

Product: Adobe Acrobat Reader Mobile
Device & OS: iOS / iPhone
Scenario: Opening PDF documents, navigating the app, or copying text from files.
Observed behavior: Documents take 15 to 60 seconds to open, text copying fails, or the application crashes entirely due to storage or background processes.

Before you start

Ensure your iPhone has at least 1-2 GB of free internal storage space available and verify that you have a stable internet connection if accessing cloud-stored PDFs.

Solution 1Recommended

Offload Acrobat Reader and Clear Background Apps

Offloading the app clears corrupted temporary data without deleting your saved PDFs, which frequently resolves lag and crashing issues.

When your iPhone runs low on memory or the app's cached data becomes corrupted, Acrobat Reader may struggle to open files efficiently. Offloading removes the core app files while preserving your personal documents.

Close background applications

Swipe up from the bottom of your iPhone screen to open the app switcher, then swipe up on all other open apps to close them and free up active memory.

Navigate to iPhone Storage settings

Open the Settings app on your iPhone, tap on 'General', and then select 'iPhone Storage'.

Offload the application

Scroll down the list to find and tap 'Acrobat Reader'. Tap 'Offload App' and confirm your choice. This removes the app but keeps its documents and data safely stored.

Reinstall and restart the device

Tap 'Reinstall App' on the same screen. Once the installation is complete, hold the power button to restart your iPhone, then open Acrobat again.

Offload Acrobat Reader and Clear Background Apps

Data Preservation: Your downloaded PDF files and custom app settings are completely safe during the offloading process.

Solution 2

Update Acrobat Reader and iOS

Outdated software can cause compatibility issues leading to app crashes and slow load times.

Open and Edit PDFs Seamlessly with WPS Office

If Acrobat Reader continues to crash or perform poorly on your iPhone, try WPS Office. It provides a lightweight, incredibly fast PDF viewer and editor, ensuring your documents open instantly without lagging or crashing.

1. Install WPS Office: Download WPS Office from the iOS App Store and launch the application on your iPhone.
2. Open your PDF file: Tap the 'Files' tab at the bottom of the screen, navigate to your local iPhone storage or iCloud, and select the PDF document.
3. Read and annotate smoothly: Use the highly optimized viewing engine to read your document instantly, and tap the 'Tools' menu to add highlights, comments, or signatures without lag.

Lightweight application that uses less iPhone storage and RAM.Seamlessly opens, views, and edits large PDF documents on mobile without crashing.Fully compatible with standard PDF formats and Adobe Acrobat files.Built-in tools for annotating, signing, and managing PDFs directly from your iPhone.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Acrobat Reader take so long to open PDFs on my iPhone?

This usually happens due to a buildup of cached app data, extremely low available iPhone storage space, or conflicts with other background processes consuming your device's active memory.

Will offloading Acrobat Reader delete my saved PDF files?

No, offloading the app only removes the application system files to free up space. All your saved PDF documents, files, and personalized app data will remain safely on your iPhone.

What should I do if the app works better only when I am logged out?

If the app performs significantly faster when logged out, the issue might be related to syncing a large volume of data with Adobe Document Cloud. Try clearing your cloud cache or temporarily turning off background document syncing.

PDF Troubleshooting