Design & Development

18 Free Tools to Test Your Website

Need some free help with your website? There are a variety of free tools available to test your website so that it performs well and meets established online standards.

Here is a list of free tools to test your website. There are tools to measure download speed, test usability, and monitor traffic patterns, locate broken links, evaluate search engine and browser compatibility, and determine mobile-friendliness. In addition to finding errors, many of these tools with offer solutions to fix your site’s problems.

Free Tests for Your Website

W3C Markup Validation. The Markup Validator is a free tool and service that validates markup. Most web documents are written using markup languages, such as HTML or XHTML. The validator compares your HTML document to the defined syntax of HTML and reports any discrepancies.

W3C Markup Validation.

W3C Markup Validation.

W3C Link Checker. This Link Checker looks for issues in links, anchors and referenced objects in a web page, CSS style sheet, or recursively on an entire website.

W3C Feed Validation Service. This is the W3C Feed Validation Service, a free service that checks the syntax of Atom or RSS feeds.

W3C mobileOK Checker. This checker performs various tests on a web page to determine its level of mobile-friendliness. The tests are defined in the mobileOK Basic Tests 1.0 specification.

YSlow. YSlow analyzes web pages and why they’re slow based on Yahoo’s rules for high performance websites. YSlow summarizes the page’s components, displays statistics about the page, offers suggestions for improving performance, and provides tools for analysis.



Dr. Watson. Dr. Watson is a free service to analyze your web page. Enter the URL and Watson will get a copy of it directly from the web server. Watson can also check out many other aspects of your site, including link validity, download speed, search engine compatibility, and link popularity.

Pingdom Website Speed Test. Pingdom Website Speed Test analyzes the load speed of your websites and shows you how to make them faster. View file sizes, load times, and other details about every single element of a web page to identify performance bottlenecks. See how your website conforms to performance best practices from Google Page Speed. Trace your performance over time and from multiple locations.

Browsera. Browsera tests and reports cross-browser layout differences and scripting errors on your site. JavaScript errors from each browser are collected and reported after your test is complete. Browsera is a premium service, but it does have a free plan limited to 25 pages and 1 user.

Browser Shots. Browsershots makes screenshots of your web design in different operating systems and browsers. It is a free open-source online tool to test browser compatibility in one place. When you submit your web address, distributed computers open your website in their browser, take screenshots, and upload them for your review.

Browser Shots.

Browser Shots.

Web Page Analyzer. Here’s another website speed test to improve website performance. Enter a URL below to calculate page size, composition, and download time. The script incorporates the latest best practices from Website Optimization Secrets, web page size guidelines and trends, and website optimization techniques into its recommendations.

AccessColor. AccessColor tests the color contrast and color brightness between the foreground and background of all elements in the DOM to make sure that the contrast is high enough for people with visual impairments. AccessColor will find the relevant color combinations within your HTML and CSS documents rather than requiring you to find each value to input yourself in order to test the contrast between each color combination.

Concept Feedback. Concept Feedback is a website to have others test your website and provide feedback. It’s a premium service, but it does have a free service to test a website through the community forum. Review other concepts for the community to earn free tests.

After the Deadline. After the Deadline is a web app to check spelling or grammar, or get style suggestions. Simply paste or compose a document in the text window. Click Check Writing to check for errors and to get quick feedback on your writing.

After the Deadline.

After the Deadline.

ClickHeat. ClickHeat is a visual heatmap of clicks on a HTML page, showing hot and cold click zones. It’s an easy way to test your site and find out where users are clicking. ClickHeat is an open source application, released under GPL license, and free of charge. Site Speed Checker. This speed test allows up to 10 URLs in a single test. Get the time it takes to obtain a control packet from the remote host. High values of packet loss and reaction time indicate low connection performances, while low response time means faster connection and more reliable. It also shows the duration of a given site, the length of time a site takes to load.

Web Developer. This Firefox extension from Mozilla contains a set of free tools to inspect and test your pages. Use the Page Inspector and Debugger to inspect your code and track down bugs. The Network Monitor includes a performance analysis tool, to help show you how long the browser takes to download the different parts of your site.

HERA. HERA is a tool to check the accessibility of web pages according to the specification Web Content Accessibility Guidelines. HERA performs a preliminary set of tests on the page and identifies any automatically detectable errors or checkpoints met, and which checkpoints need further manual verification.

Xenu’s Link Sleuth. Xenu’s Link Sleuth checks websites for broken links. Link verification is done on normal links, images, frames, plugins, backgrounds, local image maps, style sheets, scripts and Java applets. It displays a continuously updated list of URLs, which you can sort by different criteria.

Xenu's Link Sleuth.

Xenu’s Link Sleuth.

Sig Ueland

Sig Ueland

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