What clearing cache actually does
Clearing Facebook's cache means deleting the temporary files your iPhone stores to make the app load faster. When you use Facebook, your phone saves images, videos, login information, and page layouts in a hidden folder. Over time this folder grows — sometimes to several gigabytes — and can slow down the app or cause it to freeze or crash.
Clearing the cache does not delete your messages, photos, or account information. It only removes the copies your phone made to speed things up. Facebook will re-read these files the next time you open the app, so your first load after clearing cache may be slightly slower, but the app usually runs better afterward.
Key Takeaways
- Clearing Facebook cache removes temporary files stored on your iPhone but keeps your messages, photos, and account data intact.
- The fastest method is to go to Settings, tap Facebook, and choose "Clear Cache" if your iPhone shows that option.
- If your iPhone does not show a Clear Cache button, you can delete and reinstall the Facebook app instead, which clears all cached data.
- Clearing cache works best when the app is running slowly, crashing repeatedly, or taking up unusual amounts of storage space.
The Settings method (fastest if available)
On some iPhones running recent versions of iOS, you can clear Facebook cache directly from your phone's Settings app. Open Settings, scroll down and tap Facebook, then look for a "Clear Cache" button. If you see it, tap it once — your phone will ask you to confirm, and the cache clears when ready.
Not all iPhones show this option. If you do not see "Clear Cache" under Settings > Facebook, move to the reinstall method below. The option depends on your iOS version and whether Facebook has enabled it for your region.
The reinstall method (works on all iPhones)
If Settings does not show a Clear Cache button, delete the Facebook app and reinstall it. Press and hold the Facebook app icon on your home screen until a menu appears, then tap "Remove App" and confirm. Go to the App Store, search for Facebook, and tap the cloud icon with a down arrow to reinstall it.
When you reinstall, the app will ask you to log in again. Your account and all your data remain on Facebook's servers, so you will see all your messages and photos once you sign back in. This method clears not just cache but also any stored login tokens and temporary files, which sometimes fixes problems that clearing cache alone does not.
When to clear cache versus when to reinstall
Start with clearing cache if the app is slow, images are not loading properly, or you see repeated error messages. If clearing cache does not fix the problem after a day or two, reinstall the app instead. Reinstalling is also the right move if Facebook keeps crashing when you open it, because a corrupted cache file sometimes survives a straightforward cache clear.
If you reinstall and the problem returns within a few days, the issue is probably not cache — it may be a bug in that version of Facebook, or a problem with your internet connection. In that case, check whether Facebook has released an update in the App Store, or contact Facebook's support through the app itself.
What happens to your data
Clearing cache or reinstalling Facebook does not touch your messages, photos, videos, or any content you have posted. All of that lives on Facebook's servers, not on your phone. When you log back in, you will see everything exactly as you left it.
The only data that gets cleared is your login session — you will need to enter your password again after reinstalling. If you use Face ID or Touch ID to log in to Facebook, you will need to set that up again too. This is actually a security feature: if someone else had access to your phone, clearing the session logs them out.
Storage space and when cache gets large
Facebook cache can grow to 500 megabytes or more if you scroll through a lot of videos or use the app daily. If your iPhone storage is nearly full, clearing Facebook cache can free up space quickly. You can check how much space Facebook is using by going to Settings > General > iPhone Storage, scrolling to Facebook, and tapping it.
If Facebook shows as taking up more than 1 gigabyte, clearing cache will almost certainly help. If it shows less than 200 megabytes, cache is probably not your problem — the slowness may be coming from your internet connection or from too many apps running at once.
Preventing cache buildup going forward
You do not need to clear Facebook cache on a schedule. Clear it only when you notice the app is slow, crashing, or taking up too much storage. If you find yourself clearing cache more than once a month, consider whether you are using Facebook for video-heavy tasks like watching Reels or live streams — those generate cache faster than text and photos.
One way to reduce cache buildup is to close Facebook completely when you are done using it. On iPhone, swipe up from the bottom of the screen (or swipe down from the top right on newer models) to open the app switcher, find Facebook, and swipe it up to close it. This does not clear cache, but it stops the app from running in the background and downloading new content.
Frequently Asked Questions
Will clearing cache log me out of Facebook?
Clearing cache alone usually does not log you out. Reinstalling the app will log you out and require you to enter your password again. If you use Face ID or Touch ID, you will need to set that up again after reinstalling.
How often should I clear Facebook cache?
Clear cache only when you notice the app is slow, crashing, or using a lot of storage space. Most people do not need to clear it more than a few times a year. If you are clearing it weekly, the problem may be something other than cache.
Does clearing cache delete my messages?
No. Your messages, photos, and all account data stay on Facebook's servers. Clearing cache only removes temporary files your phone stored to make the app faster. When you log back in, all your messages and photos will be there.
What if Facebook still crashes after I clear cache and reinstall?
Check the App Store to see if a newer version of Facebook is available — tap Updates and look for Facebook. If an update exists, install it. If crashes continue after updating, the problem is likely a bug in that version of Facebook or an issue with your internet connection, not something clearing cache will fix.
Can I clear cache for other apps the same way?
Yes. Go to Settings > General > iPhone Storage, find the app, tap it, and look for an option to offload or delete the app. Some apps also have their own cache-clearing option in their settings menu, similar to Facebook.