[Full Guide] How to Fix System Data iPhone Storage High

What is system data on iPhone? Why is it so high and how to fix? Find answers in this post. And you can solve the problem with the professional tool in a very short time.

Kathy by Kathy Updated November 15, 2023
Share this:

Why is my system data so high on my iPhone?

No matter how many times I follow the recommendations and offload and delete apps - my iPhone 12 storage always fills up - I can’t figure out why. Any way to fix the system data iPhone storage high issue?

- Question from Apple Community

What is system data on iPhone?

In iOS, system data refers to "caches, logs, and other resources in use by the system," including temporary files not strictly linked to an app's storage. This data is fluid and adjusts according to system requirements, with the iPhone clearing it automatically when not needed.

system data iphone storage too high

For instance, Safari browsing history isn't classified under app data but is stored as cache, contributing to system data. Similarly, content downloaded for offline use in streaming apps falls into this category. The "System Data" portion in storage seems to encompass temporary files and miscellaneous data beyond app size.

How to check iPhone storage

If you need to check your iPhone storage, just go to the Settings app on your iPhone > Tap General, then choose iPhone Storage to see it.

check your iPhone storage

The storage bar visually displays the utilized storage. Below, individual apps are listed showcasing their storage usage. Tapping each reveals the app's size, file consumption, and options to offload the app or delete its data. At the list's bottom, you'll find System Data.

Why is system data so high on your iPhone?

System data on an iPhone encompasses various essential components and functionalities that contribute to the device's operations. Several factors can contribute to the system data appearing high:

frown A significant portion of system data comprises the iOS operating system and its firmware. With each update, the system data may increase to accommodate new features, security updates, and improvements.
frown iOS generates cache and temporary files to optimize performance, store app data, and facilitate smoother operations. Over time, these files can accumulate.
frown The system collects logs and diagnostic information to track errors, monitor performance, and provide data for troubleshooting purposes.
frown The iPhone reserves space for system processes, such as managing updates, background tasks, system settings, and other core functionalities. This reserved space ensures the device functions smoothly.
frown  Some app-related data might fall under system storage, especially if it's integral to the functioning of the system or shared across multiple apps.
frown Occasionally, corrupted or fragmented data within the system can occupy more space than necessary, contributing to higher system data.

How to fix system data iPhone storage high

If you need to erase documents or data on iPhone to clear up your system storage, try these ways below to learn how to clear system data on iPhone storage without resetting.

Method 1. Restart your iPhone

Restarting your iPhone can release system resources and clear temporary files. It's a simple way to refresh your phone without resetting it entirely.

For iPhone X/11/12/13 or later: Press and hold either volume button and the side button simultaneously until the power-off slider appears > Drag the power-off slider to the right to turn off your device.

restart iPhone

For iPhone 6/7/8 or SE(2nd or 3rd generation): Press and hold the side button until the power-off slider appears on the screen > Drag the slider to the right to power off your iPhone.

For iPhone SE (1st generation), 5, or earlier: Press and hold the top button > When the power-off slider appears, drag the slider to turn off the device.

After 30 seconds, hold down the side or top button until the Apple logo appears to restart your iPhone.

Method 2. Delete data with a professional tool

When it comes to freeing up iPhone storage without resetting your device, the professional iPhone data eraser - FoneTool can be an effective tool to make it.

laugh Erase private data: You can use FoneTool to erase photos, videos, music, podcasts, contacts, etc. on your iPhone.
laugh Factory reset iPhone: FoneTool allows you to erase all iPhone data in one click when you need to sell or give it away.
laugh Selective or full backup: You can selectively or fully back up your iPhone data to PC before the erasing.
laugh Wide compatibility: FoneTool works well with various iPhone, iPad and iPod Touch, as well as the latest iOS 17. So you can easily delete podcasts on iPad.

Come and download it on your Windows PC and discover how to erase data from your iPhone running iOS 17 or any other iOS version when your iPhone system data storage is too high.

Download Freeware Win 11/10/8.1/8/7/XP
Secure Download

Step 1. Launch FoneTool on your PC > Connect your iPhone to the computer with a USB cable > If asks, tap Trust on your iPhone.


enlightened This method will delete all the selected data. If you wish to erase specific files like photos or videos, consider selectively backing up important content using FoneTool (Phone Transfer > iPhone to PC).
enlightened To clear up storage space by removing duplicate photos on your iPhone, you can access the Toolbox and select Photo Deduplication to make it.

Step 2. Go to Toolbox > choose Data Eraser.

data eraser

Step 3. Click Erase private data > Choose Get Started.

erase private data

Step 4. Tap each icon that needs to be erased and check Enable Deep Erase Technology if you want them unrecoverable, then click Start Erase.

erase data on iPhone

Clear app cache

If you don’t want to use a third-party app to finish the process, you can clear caches from apps like Safari and Messages may help minimize the data categorized under System Data on your iPhone directly to fix the iPhone storage system data high issue.

For the Safari cache: Go to Settings > Click Safari > Choose Clear History and Website Data > Tap the Clear History and Data button in the pop-up window to confirm your choice.

Note: If you find the clear Safari data button greyed out, find solutions in this passage: [9 Methods] How to Fix “Clear Safari History Greyed Out”

For the Message cache: Just go to Settings, tap Messages, then locate Message History. Changing the retention period from Forever to a shorter duration, like one year or 30 days, can help.

clear app cache


From this full guide, you can know what is system data on iPhone, why it’s so high and how to fix the system data iPhone storage high issue efficiently. Using FoneTool can be the quickest way to make it and hope you can have a pleasant experience.

FoneTool - All-in-one iPhone Data Manager

Transfer, backup and manage data on iPhone, iPad and iPod touch in an easy way.

  • iOS 17 Compatible
  • iPhone 15 Supported

Free iPhone Manager - FoneTool

  • Full/Selective Backup iPhone
  • Transfer between iPhone and PC
  • 1-Click Transfer iPhone to iPhone
  • WhatsApp Backup & Transfer
  • Fully compatible with iOS 17
Download Free
Download icon

100% Secure

Downloading.com Rating
Android Transfer is Now Supported!

Easiest way to transfer photos, videos, music, etc., between Android phone and iPhone.

Learn More >>