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Simplify site validation.

Find A11Y and HTML issues in your large sites, in seconds

Site-wide validation made easy

As a professional web developer, you take accessibility and HTML markup validation seriously. As part of your development process, you validate your site at the W3C Validator or use tools like aXe core to ensure that your sites are accessible. But validating a large site with hundreds or thousands of pages would take ages, so you're tempted to skip it.

Let our crawler do this for you! Just submit a starting URL and we'll validate all the internal pages for you. As simple as that.

Since our launch, our users have validated 2790000 web pages, caught 48010000 HTML issues and 5380000 accessibility violations.

Just give us a starting URL and we'll visit it to discover its internal pages, validate each of them using the latest versions of the W3C Validator and the axe-core accessibility engine, and produce a detailed report in seconds.

Validate large sites

Our web spider will crawl your site and check up to 5,000 pages for HTML5 conformance and accessibility, with a single click.

You can also submit an XML sitemap to specify exactly the pages to validate, for increased performance.

Accessibility checking

We'll scan the web pages found within your site in search of accessibility violations using the axe-core accessibility engine.

For each A11Y violation found, we'll provide additional help and actionable items. Check out the list of accessibility rules checked.

HTML validation

Your pages will be checked for HTML markup validation with the W3C's Nu HTML Checker, like in

Each issue found will be shown in its context, including a snippet of the affected code, line and column and link to the source.

Scheduled validations

Schedule as many validations as you need. Just enter the URL to be validated, how many pages to check, and how often you want us to check your sites.

We'll take care of running the checks and notify you when your report is ready.

Deploy hooks

You can easily connect your site with Rocket Validator, so an automatic site validation is started when you deploy a new version of your site.

Compatible with Heroku, Netlify, Github Pages, Engine Yard, Cloud66, and other hosting platforms.

Validation charts

Visualize the evolution of your sites with our history charts - your stored validation reports are converted automatically into charts.

Check out some example validation charts.

Example A11Y and HTML reports: U.S. Education

How do the major United States universities rank in their conformance of Accessibility and HTML issues?

Check our United States Universities A11Y & HTML Conformance Leaderboard to see the current ranking in U.S. universities, ranked by their HTML and A11Y scores.

U.S. Education Leaderboard

What our users say...

Web studios and freelance developers from all around the world use Rocket Validator to validate accessibility and HTML conformance on their sites as part of their web development process. Our service helps them quickly identify the parts of their sites that need more attention, so they can be fixed and re-checked until they're valid.

Nick Weaver

Nick Weaver

Senior Web Developer at University of Wisconsin–Madison. Wisconsin, USA

I’ve used various tools for running site-wide markup and automated accessibility testing and none come close to Rocket Validator for its speed, its ease of use and its clear and concise reporting of errors.
Jarrad Langdon

Jarrad Langdon

Web / Graphic Designer at Jala Design. Sydney, Australia

Rocket Validator has provided our development team with the confidence in knowing that our client's websites are performing to the best of their abilities. Prior to using this service, our sites were reviewed manually - this was a process that took time and was not completed in a consistent method. Now that we are making use of Rocket Validator we are not only saving time, but we are also seeing the excitement in fixing both HTML and Accessibility issues. Overall it's an excellent tool that has dramatically improved our development cycle.
Stephen Livesey

Stephen Livesey

Product Development Director at Exact Abacus Limited. Chorley, UK

Rocket Validator simply makes checking websites for HTML and Accessibility issues a breeze. It's so easy to use, performs validation on a regular basis using a schedule, allows us to check hundreds of pages per site and provides us with automated emails detailing the problems it finds. We've been using it since 2015 to validate the ecommerce sites we develop, I've no idea how we managed without it!
Jay Hollywood

Jay Hollywood

Director of Humaan. Perth, Australia

We've only been using Rocket Validator a short while but it's been incredibly powerful in helping us validate multiple large sites in a very short amount of time.
It has quickly become an invaluable tool in our website QA process.
Gary Westergren

Gary Westergren

Webmaster of San Diego, USA

The days of validating HTML 5 one page at a time are over! If you have hundreds or thousands of pages to validate, Rocket Validator can scrape your whole site and in a matter of minutes give you actionable information about pages that need help. Until I found Rocket Validator, this was a task that took hours, (and honestly, rarely got done).
Luis Herrero

Luis Herrero

Freelance front-end developer. Madrid, Spain

One of the key factors in robust web development is markup validation. There are some tools that help you in this task, but none of them is as fast and complete as Rocket Validator.
And my students love it!
Almudena García

Almudena García

Freelance Ruby on Rails developer. Vitoria, Spain

HTML validation is key in creating high quality web sites, but often misregarded, as validating large sites can be tedious. Luckily, we've got Rocket Validator to automate this process, just submit a starting URL and it will validate thousands of pages from your site in minutes.
Think of it as a tool to find the needles in the haystack!
Pablo Jimeno

Pablo Jimeno

Founder at Zaragoza, Spain

Rocket Validator is a powerful and straight forward tool. It not only helps us make a better product but it also improves our development process.

See plans and pricing