What is cache and how to clear it

It might have happened to you. You open a website but see a different state than expected – for example, some content is missing, the site has an old layout, or updated images don't show up, which you see elsewhere without issue. In such moments, it's often said that cache needs to be cleared.

Cache can cause the browser to work with previously stored data instead of the current ones. This typically manifests when the site changes, but your browser “doesn't know” and still displays the older version of the page.

In the following parts of the article, we'll explain what cache memory is, when it might start causing problems, and how to remove it so that the website reloads correctly.

What is cache and what is it for?

When you visit a website, the browser saves some data locally on your device. This is called cache. Most commonly, these are images, style files, or scripts that don't change every time the page is opened.

The purpose of cache memory is simple. If you return to the same website again, the browser doesn't need to download some data from the internet but rather access it from the saved cache. This makes the page open faster and puts less load on both the connection and the server.

From an ordinary user's perspective, cache is something that works automatically in the background. You don't need to turn it on or configure it, and most of the time, you're not even aware of it. That's why it's good to understand what cache is and why it exists. It's not an error or unnecessary data storage, but a common part of modern web functions and applications.

As long as everything works correctly, cache serves its purpose without limiting you. When it may become more of an obstacle than a help, we'll explore in the next section.

When cache can cause problems

Problems usually occur when the content of the website or application changes, but the browser still works with stored data. At that moment, cache doesn't fulfill its usual role of speeding things up but prevents the current version of the page from loading.

A typical example is website updates. The page has a new layout, modified styles, or different images, but the browser continues to load older files from the cache. The result can be a messy appearance, missing parts of the page, or a combination of old and new content.

Similar behavior can also appear after updating the browser or its add-ons. The way pages are rendered changes, but the stored cache memory contains files created for the previous version. The website may then react slowly, display minor errors, or behave inconsistently.

You might also encounter this when managing or debugging a website. If the page displays differently in various browsers or on different devices, often the difference lies precisely in the stored cache memory.

How to clear cache?

The procedure varies according to the browser, but the principle is always similar. Below you'll find an overview of steps for the most commonly used options.

Google Chrome

1. Open the browser menu (three dots at the top right).
2. Select Settings.
3. Go to Privacy and Security.
4. Click on Clear browsing data.
5. Select a time range (e.g., last 24 hours or all time).
6. Check Cached images and files.
7. Confirm by selecting Clear data.

Quick shortcut:

• Ctrl + Shift + Delete (Windows/Linux)
• Cmd + Shift + Delete (Mac)

Mozilla Firefox

1. Open the menu (three bars at the top right).
2. Select Settings.
3. Go to Privacy and Security.
4. In the Cookies and Site Data section, click on Clear Data.
5. Check Cached Web Content.
6. Confirm the clearing.

Quick shortcut:

• Ctrl + Shift + Delete (Windows/Linux)
• Cmd + Shift + Delete (Mac)

Microsoft Edge

1. Click on the menu (three dots at the top right).
2. Open Settings.
3. Go to Privacy, Search, and Services.
4. Select Choose what to clear.
5. Check Cached images and files.
6. Confirm the clearing.

Quick shortcut:

Ctrl + Shift + Delete

Safari (macOS)

1. Open Safari and in the top menu click on Safari.
2. Select Preferences and go to the Privacy tab.
3. Click on Manage Website Data.
4. Select Remove All.

Alternative:

If you have the Develop menu enabled, you can use the option to Empty Cache directly from the top menu.

What happens after clearing?

After clearing the cache, all necessary data will be downloaded from the server again on the next website visit. Therefore, the page may load a bit slower at first. However, once the new cache is created again, the website's behavior will return to its normal state.

In some cases, you might be prompted to log in again to websites or their default settings might be restored. It depends on whether you also cleared other stored data along with the cache, such as cookies. Simply clearing the cache won't affect accounts or saved content on websites.

The main effect is that pages are loaded in their current form. If you previously saw incomplete content, an old layout, or a combination of old and new elements, after clearing the cache, the web should display correctly.

Does regular cleaning make sense?

Clearing cache isn't something that needs to be done regularly or preventively. Cache is designed to work long-term without user intervention.

In practice, the simple rule is: if websites work correctly, there's no reason to address cache memory. Cleaning makes sense only when you need to confirm that the browser is working with current data, not what it has stored from the past.

Therefore, it's useful to know how to clear cache, but it's not necessary to make it a routine. Consider it a tool you'll return to only when there's a specific reason.