What clearing cache actually does
Cache is a storage space on your device that holds copies of things you've already downloaded — web pages, images, app data, login information. When you clear cache, you delete those copies. Your device then has to read them fresh the next time you visit that website or open that app.
Think of it like a notebook where your browser writes down "I already have a copy of this photo from that website." When you clear cache, you tear out those pages. The next time you visit, your browser has to ask the website for the photo again instead of using its own copy.
Clearing cache does not delete your passwords, usernames, or saved payment methods — those live in a different storage area called cookies or credential storage. It also does not delete your actual files, photos, or documents.
Key Takeaways
- Cache is a storage space holding copies of things you've downloaded; clearing it removes those copies but not your passwords or files.
- Clearing cache can fix slow loading, broken images, or pages that won't update to their newest version.
- You can clear cache manually in your browser or app settings, or set your device to clear it automatically when you close the browser.
- Clearing cache makes your first visit to a website slower because your device has to read everything fresh, but later visits may feel faster.
When clearing cache actually solves a problem
A website or app stores old versions of images, code, and data in your cache to load faster next time. If that website updates but your cache still holds the old version, you see outdated information or broken layouts. Clearing cache forces your device to read the current version.
This fixes problems like: a website showing the wrong information even after you refresh, images not loading properly, a page layout that looks broken, or an app crashing when you open it. If you've tried refreshing the page and it didn't work, clearing cache is the next step.
Cache can also take up storage space on your device over time. On phones with limited storage, clearing cache occasionally can free up a few hundred megabytes — not enough to solve a full storage problem, but enough to help.
How to clear cache on different devices
On Chrome (computer or phone): Open Chrome, tap the three-line menu (top right on phone, top left on computer), select Settings, then Privacy and Security. Choose "Clear browsing data," make sure "Cached images and files" is checked, and tap Clear Data.
On Safari (iPhone or Mac): On iPhone, go to Settings, scroll to Safari, tap Clear History and Website Data. On Mac, open Safari, go to History menu, and select Clear History.
On Firefox (computer or phone): Open Firefox, tap the three-line menu, select Settings, go to Privacy, and under Cookies and Site Data, tap Clear Data. Make sure "Cached Web Content" is checked.
On Android apps: Go to Settings, select Apps (or process Manager), find the app, tap Storage, and select Clear Cache. This removes only the cache, not the app's data or your login information.
The trade-off: speed now versus speed later
When you clear cache, the first time you visit a website or open an app, it loads slower because your device has to read everything from scratch. You notice this most on slower internet connections or older devices.
After that first slow load, your device builds up cache again, and subsequent visits are faster. If you clear cache frequently, you spend more time waiting for that first load. If you never clear cache, your device stores more data and may run slower overall.
For most people, clearing cache once a month or when a specific website is broken is the right balance. You get the speed benefit of cache most of the time, but you clear out old data before it becomes a problem.
Why apps and websites ask you to clear cache
When you contact customer support for a website or app that's not working right, they often ask you to clear cache before anything else. This is because cache problems are common and straightforward to fix, and it eliminates that possibility before they spend time on harder troubleshooting.
Some apps also ask you to clear cache if they're using too much storage. A social media app, for example, stores thumbnail images of every post you've scrolled past. Over months, that can add up to hundreds of megabytes. Clearing cache removes those thumbnails without deleting your actual account or saved posts.
Automatic cache clearing
You can set your browser to clear cache automatically every time you close it, so you don't have to remember. On Chrome, go to Settings, Privacy and Security, and under Clear Browsing Data, select "On exit." On Firefox, go to Settings, Privacy, and under Cookies and Site Data, check "Delete cookies and site data when Firefox is closed."
The downside is that you lose the speed benefit of cache — every time you reopen the browser, it's like your first visit to each website. For most people, manual clearing once a month is less annoying than automatic clearing every day.
Clearing cache versus clearing cookies and data
Cache holds copies of images and code. Cookies hold information about you — your login status, your preferences, items in your shopping cart. Site data is information apps and websites store about your activity.
When you clear cache, you keep your cookies and site data, so you stay logged in and websites remember your preferences. When you clear cookies and site data, you get logged out of everything and lose saved information. Most of the time, you want to clear cache only, not cookies.
Some browsers let you choose what to clear. In Chrome's Clear Browsing Data window, you can uncheck Cookies and other items and clear only Cached Images and Files. This is usually the safest choice.
Frequently Asked Questions
Will clearing cache delete my passwords?
No. Passwords are stored separately from cache. Clearing cache removes only copies of images and code. If you want to delete saved passwords, you have to do that in a different settings area — usually under Passwords or Autofill in your browser settings.
Does clearing cache speed up my device?
It can, but usually only if your cache has grown very large. Cache is meant to make things faster, not slower. If clearing cache makes your device noticeably faster, it means your cache had grown to several gigabytes — which is unusual unless you haven't cleared it in years.
How often should I clear cache?
Once a month is reasonable for most people. If a website is broken or loading incorrectly, clear cache when ready. If your device is running low on storage, clear cache to free up space. You don't need to clear it more often than that unless you're on a device with very limited storage.
What's the difference between clearing cache and restarting my device?
Restarting closes all apps and clears temporary memory, but it doesn't delete cache — cache stays on your device. Clearing cache specifically removes stored copies of websites and app data. For most problems, restarting is faster to try first; if that doesn't work, then clear cache.
Can I clear cache for just one website?
On most browsers, you can clear cache for a specific site. In Chrome, visit the website, open Developer Tools (right-click, select Inspect), go to the process tab, find Storage, and delete the cache for that site. On Safari and Firefox, you usually have to clear all cache at once, not per-site.