Understand iPhone offload vs delete before cleaning up storage, so you can choose deliberately between removing an app and keeping its data.
Check what is using space
Open Settings > General > iPhone Storage. Review the app list and storage recommendations, then tap an app to inspect its details. Some cached and temporary data may not be counted in the app’s displayed usage.
Compare the two actions
Offload App removes the app itself while keeping its documents and data. Delete App removes the app and its related data. Read the confirmation carefully before choosing, especially if the app contains information you have not stored elsewhere.
Consider automatic offloading
Apple also offers Offload Unused Apps under Settings > Apps > App Store. An offloaded app retains an icon with a cloud symbol; tap it to reinstall. Automatic behavior should match your needs, particularly for apps you use only occasionally.
Choose candidates deliberately
Our suggestion is to start with an app you recognize and do not need immediately. Before removing anything, identify where its important information lives and whether you can access it elsewhere. Do not assume every app stores its data in the same way.
A large app you use once a year and a smaller app required for tomorrow’s appointment deserve different decisions. Make a short list of candidates instead of clearing everything that appears near the top of the storage screen.
Test and compare
After a change, check available storage and confirm your essential apps still open normally. If you plan to rely on offloading, test reinstalling one nonessential app while you have time and a suitable connection. Keep frequently needed travel or work tools ready before leaving home.
Avoid a rushed cleanup
Review storage before a major trip, recording session or software update rather than waiting for a warning in the middle of a task. A calm review gives you time to protect important information, organize downloads and choose the least disruptive action. Storage cleanup should support your use of the phone, not create a new recovery job.
Source: Official support documentation. Interface labels may vary with software version and device.
Additional reference: Apple’s storage-management guide.