What clearing your Facebook cache actually does
Clearing your Facebook cache removes temporary files that the app stores on your phone — things like images you've already viewed, login information, and pieces of pages you've scrolled through. It does not delete your messages, photos, or any content you've posted. It simply tells Facebook to stop keeping copies of things you've already seen.
The main reason to clear cache is storage space. Over time, the Facebook app can accumulate gigabytes of these temporary files, especially if you scroll through lots of photos and videos. Clearing cache frees up that space without touching anything you actually care about. On some phones, a full cache can also slow down the app slightly, so clearing it occasionally can make Facebook load a bit faster.
One thing cache clearing does not do: it will not log you out or change your privacy settings. You'll still be signed in when you reopen the app, and your account will work exactly as it did before.
Key Takeaways
- Clearing Facebook cache removes temporary files the app stores, freeing up phone storage without deleting your messages or posts.
- On Android, go to Settings > Apps > Facebook > Storage > Clear Cache; on iPhone, you must delete and reinstall the app to clear cache completely.
- Clearing cache does not log you out or change any of your account settings or privacy choices.
- You can also clear cache through your phone's main settings menu rather than within the Facebook app itself.
How to clear cache on Android phones
Open your phone's Settings app, then find Apps or Application Manager (the exact name varies by phone brand). Scroll down and tap Facebook. You'll see a Storage or Storage and Cache option — tap that. You should see two buttons: one says Clear Cache and one says Clear Data. Tap Clear Cache only. This removes the temporary files without touching your account.
If you can't find this menu, an alternative route works on most Android phones: go to Settings > Storage > Other Apps or Cached Data, find Facebook in the list, and tap Clear Cache from there. Either path does the same thing.
How to clear cache on iPhone
iPhone does not have a built-in "clear cache" button for individual apps the way Android does. Instead, you delete the Facebook app and reinstall it. Open the App Store, search for Facebook, and tap Get to reinstall it. When you sign back in, the app will have no cached files from before.
This sounds like more work than Android, but it actually clears more thoroughly — you're removing not just cache but also temporary login tokens and other stored data. The tradeoff is that you'll need to sign in again, though you can use your saved password if your phone remembers it.
How much storage you'll actually free up
The amount varies widely depending on how much you use Facebook. Light users might free up 100 to 300 megabytes. Heavy users who scroll through lots of photos and videos daily can accumulate 500 megabytes to over a gigabyte. You can check how much space Facebook is using before you clear it: on Android, that Storage menu shows the exact number. On iPhone, go to Settings > General > iPhone Storage, find Facebook in the list, and it will show you the app size.
If you're running low on storage, clearing Facebook cache is worth doing, but it's usually not the biggest space-saver on your phone. Photos and videos you've taken typically take up far more room. If you need significant space back, look at deleting old photos or videos first, then clear app caches as a secondary step.
When to clear cache and how often
There's no harm in clearing cache weekly or monthly if you use Facebook heavily. Some people do it once every few months. There's no downside to clearing it frequently — the app will just rebuild the cache as you use it. If your phone is running slowly or you're getting storage warnings, clearing cache is a safe first step that takes about a minute.
You don't need to clear cache before logging out or before updating the app. Those actions don't require it. The only real reason to clear cache is if you want the storage space back or if the app is behaving oddly (though restarting the app usually fixes that faster than clearing cache does).
The difference between clearing cache and clearing data
On Android, you'll see both options in that Storage menu. Clear Cache removes temporary files only. Clear Data removes everything — cache, login information, saved passwords, and settings. Clearing Data will log you out and reset the app to how it was when you first installed it. Only choose Clear Data if something is seriously broken with the app and you want a fresh start. For normal storage cleanup, always choose Clear Cache.
On iPhone, deleting and reinstalling the app is closer to clearing data than clearing cache, since you're removing everything. If you just want to free up a small amount of space and don't want to sign in again, you might skip it and clear space some other way instead.
What happens after you clear cache
The next time you open Facebook, it will take a few extra seconds to load because it's rebuilding the cache from scratch. You might notice images loading slightly slower the first time you scroll through your feed. After a few minutes of normal use, everything returns to normal speed. Your feed, messages, and all your content will be exactly as you left it.
If you were in the middle of typing a message or composing a post when you cleared cache, that unsaved draft will be gone. For that reason, it's worth clearing cache when you're not actively using the app, rather than in the middle of a session.
Frequently Asked Questions
Will clearing cache delete my messages?
No. Clearing cache only removes temporary files stored on your phone. Your messages, photos, and all account data stay on Facebook's servers and will be there when you sign back in. Nothing you've posted or received will be affected.
Do I need to clear cache before updating Facebook?
No. Updates install fine whether your cache is full or empty. Clearing cache before an update does not help or hurt anything. You can update the app whenever a new version is available without worrying about cache.
Why does Facebook keep rebuilding cache after I clear it?
The app stores temporary copies of images, videos, and pages you view so they load faster next time. This is normal behavior and happens automatically as you use the app. There's no way to stop it, and you don't need to — it's designed to improve your experience, not harm it.
Can I clear cache without deleting the app on iPhone?
Not through the Facebook app itself. iPhone's system does not give apps a direct way to clear their own cache. Deleting and reinstalling is the most complete method. Alternatively, you can go to Settings > General > iPhone Storage, find Facebook, and tap Offload App, which removes the app but keeps your data. Then reinstall it from the App Store. This is slightly faster than a full delete-and-reinstall.
Is it safe to clear cache?
Yes, completely safe. Clearing cache cannot harm your account, log you out permanently, or cause any problems. It's one of the safest things you can do to maintain your phone's storage and performance.