The Settings app’s Storage screen breaks down space usage by app and offers direct suggestions, such as offloading unused apps while keeping their data intact for reinstallation later.
Enabling ‘Optimize Photo Storage’ keeps a lightweight version on the device while storing full-resolution originals in iCloud, freeing significant space for anyone with a large photo library.
Clearing app-specific caches, particularly in messaging and social media apps, can recover several gigabytes that rarely show up as an obvious culprit.