Browser Cache: What It Is and When to Clear It

A browser cache is a temporary storage location on your device where your browser saves copies of website files, including images, stylesheets, scripts, and HTML, after you first load a page. On every subsequent visit, the browser serves those files locally rather than downloading them from the server again.

How the Browser Cache Works

When you visit a website for the first time, your browser downloads every resource needed to display it: images, fonts, CSS stylesheets, and JavaScript files. These assets are stored in a dedicated folder on your device. The web server attaches HTTP response headers to each resource, most commonly Cache-Control and Expires, which tell the browser how long the file may be kept before a fresh copy should be requested.

On your next visit, the browser checks its local cache first. If a valid, non-expired copy of a file exists, it loads locally without contacting the server. This is called a cache hit. If the file is missing or expired, the browser fetches it fresh from the server, a cache miss. The combination of cache hits for unchanged static assets and cache misses only for updated files is what makes returning visits measurably faster than first visits.

Browser Cache, Cookies, and Server Cache: What Sets Them Apart

Three terms appear often in the same conversation: browser cache, cookies, and server-side cache. They serve related goals but operate at different levels and should not be confused.

• Cookies store small text files containing user-specific data: login session tokens, language preferences, shopping cart state. They travel between browser and server on each request so the server can identify and personalise the session. The browser cache, by contrast, stores visual and structural page assets to avoid re-downloading files that have not changed.
• Server cache and CDN cache live on the infrastructure side, not on the user's device. A server cache stores pre-built page output to reduce processing load when many visitors request the same content simultaneously. A CDN (Content Delivery Network) distributes asset copies across geographically dispersed nodes so files arrive from a location closer to the visitor. Both reduce round-trip latency from server to user, while the browser cache removes the network round trip entirely for any file already stored locally.

The practical distinction matters day-to-day: clearing the browser cache on your device does not reset your login session (cookies are stored separately), and it has no effect on what the server or CDN has cached. Each layer is independent.

A Practical Example

Illustrative scenario, not a real client figure: You publish a revised homepage hero image on a Monday morning. A colleague who visited the site on Friday opens the page and still sees the old image. Their browser cached the previous version during that Friday visit, and the cache entry is configured to expire after seven days. A hard refresh (Ctrl + Shift + R on Windows and Linux, Cmd + Shift + R on macOS) forces the browser to bypass its local copy and download the current file directly from the server.

This scenario is the most common reason website editors report that their published changes are not visible. The content has been saved and deployed; the visitor's browser has not yet been prompted to fetch it. Understanding this distinction spares unnecessary investigation of the publishing pipeline or CMS settings.

Why the Browser Cache Matters for Your Website

For returning visitors, the browser cache reduces page load times by serving static assets locally, skipping re-downloads of images, fonts, and scripts that have not changed. This directly affects Largest Contentful Paint (LCP), one of Google's Core Web Vitals that contribute to search rankings.

When you update your site, a cache-busting strategy ensures browsers recognise the new files. The most common approach is appending a version number or content hash to file names, for example style.v4.css instead of style.css. Without this, visitors may load outdated CSS or JavaScript for the full duration of the cache expiry period. Identifying and resolving technical SEO errors is a reliable method for surfacing caching problems that are invisible inside the CMS but visible in performance and search data.

Managed platforms like Webflow configure caching headers automatically for hosted sites, which removes this complexity for editors and content managers. For teams comparing platforms, the Framer vs. Webflow 2026 comparison covers how each handles asset delivery and performance. For a broader overview of what to expect from a professionally built site, the guide on Webflow websites for businesses covers the relevant considerations.