There is no single button that clears every cache on an iPhone. The right method depends on whether you are trying to clear Safari website data, remove an app’s stored files, or free general storage.
Clear Safari history and website data
Open Settings and find Safari in the Apps section or the Safari settings area used by your iOS version. Use the history and website-data controls to clear browsing information. Be aware that clearing website data can sign you out of websites and remove stored site preferences.
Clear data for another browser
Chrome, Firefox, Edge, and other browsers manage much of their cache inside the browser itself. Open that browser’s settings and look for privacy, history, or browsing-data controls. Choose only the data types you actually want to remove.
Clear an app cache
Many iPhone apps do not expose a universal Clear Cache button. Check the app’s own settings first. If an app has accumulated a large amount of replaceable data and provides no clearing option, deleting and reinstalling the app can remove its local data—but only do this after confirming that important information is synced or backed up.
Offloading an app is different from deleting it. Offloading removes the app itself while retaining its documents and data, so it may not clear the data you are trying to remove.
Use iPhone Storage to find the real problem
Open Settings > General > iPhone Storage to see which apps and categories use the most space. This is more useful than randomly clearing caches when your actual goal is to recover storage.
Photos, downloaded videos, message attachments, offline music, podcasts, and large app documents can use far more space than browser cache.
Restarting is not the same as clearing cache
A restart can resolve temporary glitches and clears some temporary activity, but it does not erase all cached files. Avoid third-party apps that promise to perform impossible system-wide cleaning tasks or ask for unnecessary access to your data.
Will clearing cache make an iPhone faster?
Sometimes, but not always. Clearing corrupted browser data can fix a website problem, and removing an oversized app cache can recover storage. Constantly deleting healthy cache files can actually make an app download the same data again. Clear a cache when you have a specific storage or troubleshooting reason rather than treating it as required maintenance.
Protect logins and offline files
Before clearing browser data or reinstalling an app, make sure you know the relevant passwords and understand what is stored locally. Offline maps, downloaded media, drafts, and unsynced documents can disappear when an app is deleted even though they look like replaceable cached data.
Matthew Roberts created this site to help his friends and family with questions that they might have about how to change the settings on their iPhones. It now serves as an archive of iPhone how-to guides to help anyone that stumbles upon this website.