Free Website Testing Tools for Web Developers

A collection of tools to help you test your website projects and find ways to improve your build quality.

Kyle Van Deusen


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Kyle Van Deusen

Kyle Van Deusen

The Admin Bar

After spending 15 years as a graphic designer and earning a business degree, I launched my agency, OGAL Web Design, in 2017. A year later, after finding the amazing community around WordPress, I co-found The Admin Bar, which has grown to become the #1 community for WordPress professionals. I'm a husband and proud father of three, and a new resident of the Commonwealth of Virginia.

A crash test dummy sitting at a computer with his hands on the keyboard
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No website is perfect, but that shouldn’t stop us from trying to make the best websites possible.

Unfortunately, there are only so many things your brain can keep up with… SEO, accessibility, performance, design, best practices… The list goes on and on.

Though far from perfect, testing tools can be a great way to double check your work, find opportunities, and ensure you’re delivering the best product possible.

In this post you’ll find dozens of web-based testing tools to help you test your work.

Our Criteria

With thousands of tools on the market, I had to draw the line somewhere. Here’s a quick look at the criteria I used to build out the list:

  • Must be browser-based. I doubt you want to download more software to your computer, so all of these tools are browser-based.
  • No login required. There are some tools out there that offer free diagnostics, but you have to sign up to get them. Those didn’t make the list.
  • Something useful for free. Many of these tools offer a premium (paid) option, but to make it on this list they had to do something useful for free.
  • Tests quality / identifies issues. There are lots of tools like BuiltWith or DNS checkers that do scan your website, but they are just listing records, not testing anything — so for the purposes of this list they have not been included.

Note: Descriptions of each product were taken directly from the company and are not necessarily my personal opinion.

With that, lets go!

Jump to specific category of tools:

Accessibility Testing Tools

Screenshot of the Wave Accessibility evaluation tool in use


Pricing Model: Free

WAVE® is a suite of evaluation tools that helps authors make their web content more accessible to individuals with disabilities.

A screenshot of the results of the WebFX Readability Test

WebFX Readability Test

Pricing Model: Free

Quick and easy way to test the readability of your work.

Browser Testing Tools

A screenshot showing the results of the Screenfly test


Pricing Model: Free

Test your website at different resolutions! Screenfly is here to show you how your website looks on any device.


A screenshot of the results page using 2GDPR


Pricing Model: Free

Free online tool to check website cookies for GDPR compliance and analyze webpages for SSL usage

A screenshot of the results using the COokieMetrix Website.


Pricing Model: Freemium

CookieMetrix gives you insight about cookies installed from your website before the visitor’s consent.

Performance Testing Tools

A screenshot of the Dareboost test results.


Pricing Model: Freemium

All-in-one service for website speed test, web performance monitoring and website analysis (speed, SEO, quality, security). Web performance has never been so easy.

A screenshot of the results of the GTMetrix test.


Pricing Model: Freemium

GTmetrix has a suite of features and options to make optimizing your website clear and easy.

A screenshot of Page Speed Compare showing two different website's test results

Page Speed Compare

Pricing Model: Free

Compare performance metrics of your pages against each other or your competitors using Google PageSpeed Insights.

A screenshot of the results of the PageSpeed Insights test

PageSpeed Insights

Pricing Model: Free

PageSpeed Insights (PSI) reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.

A screenshot of the results of the Pingdom test.


Pricing Model: Freemium

Use this free Website Speed Test to analyze the load speed of your websites, and learn how to make them faster.

A screenshot of the test results using SpeedVitals.


Pricing Model: Free

Test your Website Speed and measure Web Vitals using SpeedVitals. Page Speed Testing from Multiple Locations & Devices.

A screenshot of the webpagetest results.


Pricing Model: Freemium

Run a free website speed test from around the globe using real browsers at consumer connection speeds with detailed optimization recommendations.

A screenshot of the YellowLab test results


Pricing Model: Free

Yellow Lab Tools is a free online web performance analyzer. It audits a webpage for performance and front-end quality issues. And it’s open-source!

Security Testing Tools

A screenshot of the Hardenize test results


Pricing Model: Freemium

Hardenize provides a comprehensive and free assessment of web site network and security configuration.

A screenshot of the Pintest scanner tool results.


Pricing Model: Freemium

Use the Online Website Vulnerability Scanner for a full web security check. Scan website: find SQLi, XSS, misconfings, CVEs and other vulnerabilities for FREE.

A screenshot of the Securi test results.


Pricing Model: Freemium

Check your website security for free with Sucuri Sitecheck. Sitecheck scans for malware, viruses, errors, blacklist status, and out-of-date software & plugins.

A screenshot of the Security Headers home page

Security Headers

Pricing Model: Free

Quickly and easily assess the security of your HTTP response headers.

A screenshot of the results using SSL check.

SSL Check

Pricing Model: Free

This free tool will crawl an HTTPS-website (entire website, recursively, following internal links) and search for non-secure images, scripts and css-files that will trigger a “mixed content” warning message in browsers.

A screenshot of the VirtusTotal test results.


Pricing Model: Free

Analyze suspicious files, domains, IPs and URLs to detect malware and other breaches, automatically share them with the security community.

SEO Testing Tools

A screenshot of the dead link checker test results.

Dead Link Checker

Pricing Model: Free

Want to find broken links on your website for free? Check out this quick, easy to use broken link checker tool & identify 404 pages in no time.

A screenshot of the httpstatus test results.


Pricing Model: Free

Redirect checker to easily check status codes, response headers, and redirect chains.

A screenshot of the Moz testing results.

Moz Domain Analysis

Pricing Model: Freemium

Enter any domain, and we’ll show you top competitive SEO metrics like Domain Authority, top pages, ranking keywords, and more.

A screenshot of the SEO Analyzer test results.

Neil Patel SEO Analyzer

Pricing Model: Freemium

Get a complete list of errors that are hindering your site from achieving the top spot on Google. This SEO audit prioritizes each fix based on potential traffic impact and ease of implementation. Once you make changes, you can re-run the report and check to see if you did it correctly.

A screenshot of the rich results test results.

Rich Results Test

Pricing Model: Free

The official Google tool for testing your structured data to see which Google rich results can be generated by the structured data on your page. You can also preview how rich results can look in Google Search.

A screenshot of the search Engine Simulator test results.

Search Engine Simulator

Pricing Model: Free

The Search Engine Simulator tool shows you how the engines “see” a web page. It simulates how Google “reads” a webpage by displaying the content exactly how it would see it.

A screenshot of the SEObility test results


Pricing Model: Freemium

Instantly review your website for free with the SEO checker from Seobility and get tips for a better search engine optimization and higher rankings.

A screenshot of the SEOptimer test results.


Pricing Model: Freemium

SEOptimer is the web’s best SEO Checker. Improve your website, rank better in Search Engines and win more customers with beautiful SEO Reports.

A screenshot of the results from SEO Tester Online

SEO Tester Online

Pricing Model: Freemium

Check your Website’s SEO & Generate Personalized Audit with our on page SEO Tester

A screenshot of the siteliner test results


Pricing Model: Free

Free and fast analysis of your entire website – duplicate content, broken links, internal page rank, redirections and more. Also creates an XML sitemap.

A screenshot of the W3C Markup Validation test results.

W3C Markup Validation

Pricing Model: Free

This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc


A screenshot of the homepage for KeyCDN tools

KeyCDN Tools

Pricing Model: Free

Free web, network, and security tools to help troubleshoot website, network, and CDN issues for fast resolutions.

A screenshot of the Nibbler test results.


Pricing Model: Freemium

Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.

A screenshot of the Uptrends tools page.


Pricing Model: Freemium

Our free website monitoring tools get you hands-on data about your website uptime and performance. Test your website from different perspectives.

A screenshot of the test results.

Pricing Model: Free

Test your pages in a lab environment powered by PageSpeed Insights. Then get tips and recommendations to improve your user experience.

Wrapping Up

I hope you’ve found a few new tools to help improve your projects — but I’m sure that I’ve missed plenty of good ones! If you know of a tool that belongs on this list, please submit it and I’ll get it added!

A huge thank you to all the folks in The Admin Bar Community who suggested lots of the tools included on this list. If you’re looking for a great place to hang out with other WordPress professionals, come join us!

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Kyle Van Deusen

Kyle Van Deusen

The Admin Bar

After spending 15 years as a graphic designer and earning a business degree, I launched my agency, OGAL Web Design, in 2017. A year later, after finding the amazing community around WordPress, I co-found The Admin Bar, which has grown to become the #1 community for WordPress professionals. I'm a husband and proud father of three, and a new resident of the Commonwealth of Virginia.

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