How to Tell If a Website Uses Font Awesome

Font Awesome is the most popular icon library on the web, the source of the social, UI and brand icons on a vast number of sites. Because its icons use a distinctive class-naming scheme, detecting it is straightforward: inspect any icon and look for the fa/fas/fab classes and an fa-<name> class. This guide covers every reliable signal, the delivery methods, the look-alikes to rule out, and what Font Awesome usage tells you about the site.

What is Font Awesome?

Font Awesome is a comprehensive icon toolkit: thousands of scalable vector icons — UI symbols, social and brand logos, and more — that developers drop into a page with a simple class on an <i> or <span> element. Its convenience, breadth and free tier made it the default icon set across the web, bundled into countless themes, frameworks and templates. It comes in a free version (loaded from a CDN or self-hosted) and a Pro version (more icons and styles), and it offers a hosted "Kit" delivery method for easy account-managed setup.

For detection, the key context is that Font Awesome is an icon library (not a text-font service like Google Fonts), and it is so common that its presence is a near-ubiquitous building block rather than a strong differentiator. Still, recognising it is useful for understanding a site's front-end composition, spotting theme/framework usage, and dependency auditing. Because its icons carry an unmistakable class scheme and load from recognisable hosts, Font Awesome is one of the easiest libraries to confirm by inspecting an icon.

How Font Awesome is delivered and used

Font Awesome icons are marked up with style-plus-name classes. The style class indicates the variant: fas/fa-solid (solid), far/fa-regular (regular), fab/fa-brands (brand logos), fal/fa-light and fad/fa-duotone (Pro). Alongside it sits the specific icon class, fa-<name> — e.g. <i class="fab fa-github"></i> or <i class="fa-solid fa-magnifying-glass"></i>. (Version 4 used a single fa fa-<name> scheme.) These classes are the primary signal.

Delivery varies. The free CDN loads from cdnjs.cloudflare.com, jsdelivr or older use.fontawesome.com/maxcdn.bootstrapcdn.com. Kits load a single per-account script from kit.fontawesome.com/<kit-id>.js. Self-hosted installs serve the CSS/webfont or the SVG+JS from the site's own files. Rendering is either CSS + icon webfont (the classic method, where icons are font glyphs) or SVG + JS (the modern method, where the library injects <svg> elements). Knowing this — the fa/fas/fab classes, the fontawesome.com/cdnjs assets, and the Kit scripts — makes detection quick regardless of delivery.

How to tell if a website uses Font Awesome

Confirm at least one strong signal (the icon classes suffice).

1. Inspect an icon. Right-click an icon and choose Inspect. Classes like fas fa-search, fab fa-twitter or fa-solid fa-bars are the definitive signal. (In SVG mode you may see an <svg> with data-icon and fa--prefixed attributes.)

2. Check the Network tab. Filter for fontawesome. Look for assets from cdnjs/use.fontawesome.com/jsdelivr or a kit.fontawesome.com/<kit-id>.js script.

3. View the source. Search for font-awesome, fontawesome, fa- or fab. Class references and asset links are common.

4. Identify the version. The v4 fa fa-<name> scheme versus the v5/v6 fas/fa-solid schemes indicates the version.

5. Note the Kit. A kit.fontawesome.com/<kit-id>.js script confirms a Kit and identifies the account.

What the Font Awesome signals look like

<i class="fab fa-github"></i>     <i class="fa-solid fa-magnifying-glass"></i>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css">
<script src="https://kit.fontawesome.com/abc123def4.js" crossorigin="anonymous"></script>
/* SVG mode: <svg class="svg-inline--fa fa-github" data-icon="github" ...> */

The fa/fas/fab (or fa-solid/fa-brands) icon classes, or assets from fontawesome.com/cdnjs, are conclusive.

Font Awesome versus other icon sets — avoiding false positives

Match the class scheme and host. Font Awesome uses fa/fas/fab/fa-<name> and fontawesome.com/cdnjs; Material Icons / Material Symbols use the material-icons class and fonts.googleapis.com/icon; Bootstrap Icons use bi bi-<name>; Feather, Lucide, Heroicons and others render inline SVGs without the fa- scheme. The fa- prefix is specific to Font Awesome. A nuance: many themes and frameworks bundle Font Awesome, so its presence may reflect the theme's choice rather than a deliberate one. In SVG mode, confirm via the svg-inline--fa class or data-icon attribute rather than expecting a webfont.

How reliable is each signal?

The fa/fas/fab/fa-<name> icon classes are definitive, as are assets from fontawesome.com/cdnjs and a kit.fontawesome.com script. In SVG mode, the svg-inline--fa class and data-icon attribute are conclusive. The version scheme (v4 fa vs v5/v6 fas/fa-solid) reliably indicates the version. There is essentially no false-positive risk once you see the fa- classes. The only caution is interpretive: Font Awesome's ubiquity means its presence is expected and rarely differentiating. As a rule, inspecting an icon settles it immediately.

What Font Awesome usage reveals about a site

Finding Font Awesome tells you the site uses a popular, convenient icon set — a common building block. Because it is so widely used and frequently bundled into themes and frameworks, its presence is more of a default than a deliberate signal. Still, details add minor colour: a Kit indicates an account-managed setup (and Pro Kits indicate a paid plan); the version indicates how current the front end is (v4 is dated); the delivery method (CDN versus self-hosted) reflects performance choices. For dependency and performance auditing, loading the entire Font Awesome library when only a few icons are used is a common, concrete optimisation opportunity (subsetting or switching to a lighter icon approach). If you sell front-end or performance services, an unoptimised, full Font Awesome load is a small improvement to flag.

What finding Font Awesome means for sales, agencies and competitive research

For sales and prospecting, Font Awesome alone is a weak qualifier given its ubiquity, but it is a useful supporting detail and — when bundled by a theme — can corroborate the platform or template in use.

For agencies and consultants, finding Font Awesome (especially an old v4 install or a full-library load for a few icons) is a concrete performance/modernisation talking point. A Pro Kit indicates a paying customer who values icons enough to subscribe.

For competitive and market research, Font Awesome's near-universal presence rarely differentiates competitors, but its version and delivery can hint at front-end currency and performance attention.

Font Awesome in the wider front-end stack

Font Awesome sits in the UI/icon layer and pairs with anything. It is bundled into many WordPress themes, page builders (Elementor, Divi), CSS frameworks (often alongside Bootstrap), and custom builds. It is loaded from a CDN, a Kit, or self-hosted. Because it is so common, the more interesting signals are usually what else the site uses — Font Awesome just confirms the icon set. For an auditor, the valuable details are the version, the delivery method (CDN/Kit/self-hosted), whether the full library or a subset is loaded, and whether a theme or framework bundled it; together these add a small but useful detail to the site's front-end picture and flag any easy performance wins. The most common of those wins is icon subsetting: many sites load the entire Font Awesome library — hundreds of kilobytes of webfont or SVG data — to display a handful of icons, so recommending a subset or a lighter, tree-shakeable icon approach is a frequent, concrete optimisation that an audit can surface immediately.

A quick Font Awesome confirmation walkthrough

Open the site and find an icon (a social link, a menu hamburger, a search magnifier). Right-click it and choose Inspect: classes like fab fa-twitter, fas fa-bars or fa-solid fa-magnifying-glass confirm Font Awesome (in SVG mode, look for svg-inline--fa or data-icon). Open the Network tab and filter for fontawesome to find the CDN/Kit assets. Note the version scheme (v4 fa vs v5/v6 fas/fa-solid) and whether a kit.fontawesome.com script is present. The fa- icon classes are enough to confirm Font Awesome.

A quick Font Awesome detection checklist

• Inspect an icon for fa/fas/fab/fa-solid plus an fa-<name> class — conclusive.
• In SVG mode, look for svg-inline--fa class or data-icon attribute.
• Check the Network tab for fontawesome.com/cdnjs assets or a Kit script.
• Note the version (v4 fa vs v5/v6 fas/fa-solid).
• Identify a kit.fontawesome.com/<kit-id>.js Kit and account.
• Distinguish Font Awesome (fa-) from Material Icons, Bootstrap Icons (bi-) and SVG sets.

Detecting Font Awesome at scale

Checking one site is quick, but mapping icon-library usage across many domains — for front-end or dependency auditing — calls for automation. StackOptic detects Font Awesome and thousands of other technologies from a real browser, reading the rendered DOM so it catches both webfont and SVG modes. For related reading, see our guide to finding out what fonts and colours a website uses and the full Font Awesome technology profile.