Automated accessibility scanners are a great starting point, but they typically only catch about 25% to 35% of WCAG violations. To truly understand if your website is compliant and usable for people with disabilities, you must perform a manual audit. The good news? You don't need expensive software or specialized certifications to start. You already have the most powerful tools available: your browser and your keyboard.
Automated tools are programmed to look for specific code attributes, like the presence of an alt attribute on an image. However, a tool cannot tell you if that alt text actually describes the image accurately or if it provides a meaningful experience for a screen reader user. Similarly, a tool can check if a button has a label, but it cannot verify if the button's function makes sense within the context of the page flow.
Manual testing allows you to experience the site as a human user would. It uncovers "logical" errors that code-checkers miss, such as keyboard traps, non-intuitive navigation sequences, and confusing form instructions. By following the steps in this guide, you can identify high-priority barriers that could otherwise lead to legal complications or a poor user experience.
The single most important manual test you can perform is the keyboard-only test. Many users with motor disabilities or visual impairments rely on keyboards, switches, or mouth sticks rather than a mouse.
To conduct this test, put your mouse aside and use only the following keys:
As you navigate, ask yourself: Can I reach every single link? Can I close pop-ups? If you get "stuck" in a modal or a menu and cannot get back to the main content using only your keyboard, you have found a Keyboard Trap, which is a critical WCAG failure.
While tabbing through your site, look closely at the screen. You should see a visible "ring" or highlight around the element currently selected. This is the focus indicator. If you are tabbing but don't know where you are on the page, the site is inaccessible.
Equally important is the Focus Order. The focus should move in a predictable, logical sequence—usually from top to bottom and left to right. If the focus jumps from the header to the footer and then back to the middle of the page, it will confuse users who rely on keyboard navigation.
Headings (H1 through H6) are the map of your page. Screen reader users often pull up a list of headings to quickly understand what the page is about and jump to the section they need.
To audit this manually, look at your page and check for these three things:
While there are "inspect" tools, you can manually check alt text by right-clicking any image and selecting "Inspect" (in Chrome, Firefox, or Edge). This opens the Developer Tools. Look for the <img> tag and see if it has an alt="..." attribute.
Evaluate the quality of the text:
alt=""). This tells screen readers to skip the image entirely.Forms are often the most frustrating part of a website for users with disabilities. To audit forms manually, check for the following:
A basic manual audit of a single landing page can take 30 to 60 minutes. A full site audit depends on the number of unique page templates and the complexity of interactive elements.
While learning a screen reader like NVDA or VoiceOver is helpful, you can catch the majority of critical issues just by using keyboard testing and inspecting the HTML structure as described in this guide.
Missing focus indicators (the visible outline around links) and incorrect tab order are the most frequent issues found during manual audits.
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