What Happens When You Clear Your Cache? (And Should You Do It?)

By Ken Hollow, the man who told a fox spirit to “clear her cache” and had to explain that he wasn’t deleting the internet

“Ken. The website looks wrong. Everything is overlapping and the buttons don’t work.”

“Try clearing your cache.”

Three-second pause.

“My what?”

“Your cache. It’s like—”

“Are you trying to delete my internet?”

“No, Nana. Nobody can delete the internet.”

“That sounds like something someone about to delete the internet would say.”

“Clear your cache” is one of those pieces of tech advice that everyone gives and nobody explains. IT support says it. Websites say it. Your tech-savvy friend says it. But what actually IS a cache, what happens when you clear it, and should you be doing it regularly? Let’s break it down in plain language.

What Is a Cache, Exactly?

When you visit a website, your browser doesn’t just display the page and forget about it. It saves copies of images, stylesheets, scripts, fonts, and other files onto your device so that the next time you visit, it can load the page faster by using those saved copies instead of downloading everything fresh from the server.

Think of it like a restaurant menu you keep at your desk. Instead of walking to the restaurant to read the menu every time you want to order, you just look at the copy you already have. Faster, more convenient — but if the restaurant changes their menu, your copy is now outdated.

That’s exactly what a cache does. It speeds things up by storing copies of web content locally. But over time, those copies can become outdated, corrupted, or simply take up unnecessary space. That’s when clearing the cache helps.

It’s worth noting that caches exist in multiple places: your browser has one, individual apps have their own, and your phone’s operating system maintains system-level caches too. “Clear your cache” usually refers to the browser cache, but the concept is the same across all of them.

What Actually Happens When You Clear It

When you clear your cache, here’s exactly what changes:

Temporary files get deleted. All those saved copies of website images, scripts, fonts, and page elements are removed from your device. They’re gone.

Websites load fresh on your next visit. Since the cached copies are gone, your browser has to download everything from scratch the next time you visit each site. This means the first load might be slightly slower — but you’re getting the latest version of the site, not a potentially outdated copy.

A small amount of storage space is freed up. Browser caches typically range from a few hundred megabytes to several gigabytes, depending on how much you browse and how long it’s been since you last cleared it. It’s not a huge amount, but for a phone running low on storage, every bit helps.

Some website glitches may get fixed. If a website looks broken, displays incorrectly, or behaves oddly, it’s often because your browser is using an outdated cached version that conflicts with the site’s current code. Clearing the cache forces a fresh download, which usually resolves the issue. This is why “clear your cache” is the first thing tech support tells you.

And here’s what does NOT happen:

✅ Gets Cleared	❌ Does NOT Get Cleared
Temporary website files (images, scripts, CSS)	Your saved passwords (unless you specifically choose to clear those too)
Cached page layouts and fonts	Your bookmarks and favorites
Outdated copies of website content	Your photos, contacts, or personal files
Some stored website preferences	Your downloaded files
A bit of storage space	Your apps or app data (unless you clear app cache specifically)

Cache vs. Cookies vs. Browsing History — They’re Different

These three get lumped together constantly, but they’re separate things:

Cache = temporary copies of website files (images, scripts, layouts) stored to speed up loading. Clearing it makes websites download fresh content.

Cookies = small data files that websites store on your device to remember you — your login status, preferences, shopping cart contents, language settings. Clearing cookies logs you out of websites and resets your preferences. This is a bigger deal than clearing cache because you’ll need to sign back in everywhere.

Browsing history = the list of websites you’ve visited. Clearing it removes the record from your browser but doesn’t affect cached files or cookies. For more on what browsing history tools actually hide, see our guide on what incognito mode actually does.

When a browser gives you the option to “clear browsing data,” it usually lets you choose which of these to clear. For most troubleshooting, clearing just the cache is enough — you don’t need to clear cookies (and log out of everything) unless there’s a specific reason to.

How to Clear Your Cache

Chrome (Phone and Desktop)

1. Tap the three dots (⋮) in the top right → Delete browsing data (phone) or Settings → Privacy and Security → Delete browsing data (desktop)
2. Select “Cached images and files”
3. Uncheck cookies and browsing history if you only want to clear cache
4. Choose “All time” for the time range
5. Tap Delete data

Safari (iPhone)

1. Go to Settings → Safari
2. Tap Clear History and Website Data
3. Note: Safari bundles cache, cookies, and history together — clearing one clears all of them. You’ll be logged out of websites.

Firefox

1. Tap the menu (three lines) → Settings → Delete browsing data
2. Check “Cached images and files”
3. Tap Delete browsing data

App Caches (Phone)

Individual apps also have their own caches. Social media apps like Instagram, TikTok, and Facebook can accumulate gigabytes of cached data over time.

On Android: Settings → Apps → select the app → Storage → Clear Cache (not “Clear Data” — that deletes everything including your login).

On iPhone: There’s no system-wide “clear app cache” option. For most apps, you need to delete and reinstall the app to clear its cache, or check the app’s own settings for a cache management option.

When Should You Clear Your Cache?

When a website looks broken or behaves oddly. This is the #1 reason. If buttons don’t work, layouts are scrambled, or a site that used to work fine suddenly doesn’t, clearing the cache is the first fix to try.

When you’re running low on storage. If your phone or computer is tight on space, clearing browser and app caches can recover a surprising amount — sometimes several gigabytes.

When an app is crashing or behaving strangely. A corrupted app cache can cause crashes, freezes, and unexpected behavior. Clearing it often resolves the issue without losing any of your data.

As part of periodic maintenance. Clearing your cache every few months keeps things running smoothly. There’s no need to do it daily or weekly — your cache is actively helping you most of the time. Only clear it when there’s a reason to.

When you DON’T need to clear it: If everything is working fine, leave it alone. The cache exists to make your browsing faster, and clearing it unnecessarily just means slower load times until the cache rebuilds itself.

TL;DR

A cache stores temporary copies of website files on your device to make pages load faster. Clearing it deletes those temporary copies, forces your browser to download fresh content, frees up a small amount of storage, and often fixes website display problems. It does NOT delete your passwords, bookmarks, photos, or personal files. Clear your browser cache when a website looks broken, when you’re troubleshooting app issues, or when you need a bit more storage. Don’t confuse cache with cookies (which store your login sessions) — clearing cookies logs you out of everything, clearing cache doesn’t.