What is CSS HTML Validator?

CSS HTML Validator is a robust, user-friendly web development tool available for Windows, Mac, and Linux, designed to swiftly and effectively validate HTML/HTML5, CSS, accessibility, SEO, PHP, XHTML, JavaScript, links, htmx, and more. This tool not only provides invaluable and customizable recommendations but also warns users about outdated or proprietary tags, attributes, and CSS elements. Ensuring that your website is free of broken links and other issues resulting from poorly constructed HTML and CSS is essential to retaining visitors. The latest iteration of CSS HTML Validator boasts enhanced support for HTML and CSS, improved accessibility checks, htmx compatibility, new color schemes for editors, and various other enhancements. Additionally, the Pro edition features a Batch Wizard that allows users to validate entire websites and multiple HTML documents simultaneously, generating a comprehensive validation report in HTML format. You can explore CSS HTML Validator Pro for Windows at no cost for either 200 validations or a duration of 30 days, whichever occurs first, while a limited free version of htmlval is also accessible for Mac and Linux users. Overall, this tool serves as a crucial asset for web professionals aiming to improve their site's quality and performance.

Pricing

Price Starts At:
$79 (one time)
Price Overview:
CSS HTML Validator Home Edition is $79 and the Pro Edition is $149. The Mac and Linux command line tool (htmlval) is $79 (included with Pro).
Free Version:
Free Version available.
Free Trial Offered?:
Yes

Integrations

Offers API?:
Yes, CSS HTML Validator provides an API

Screenshots and Video

Main screen

Main screen

Company Facts

Company Name:
AI Internet Solutions LLC
Date Founded:
1997
Company Location:
United States
Company Website:
www.htmlvalidator.com
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Product Details

Deployment
Windows
Mac
Linux
Training Options
Documentation Hub
Support
Standard Support
Web-Based Support

Product Details

Target Company Sizes
Individual
1-10
11-50
51-200
201-500
501-1000
1001-5000
5001-10000
10001+
Target Organization Types
Mid Size Business
Small Business
Enterprise
Freelance
Nonprofit
Government
Startup
Supported Languages
English

CSS HTML Validator Categories and Features

Website Optimization Tools

Competitor Analysis
Content Management
Keyword Research Tools
Link Management
Performance Metrics
Problem Area Alerts

Web Accessibility Testing Tool

ADA Compliance
Alerts / Notifications
Automated Testing
Mobile Accessibility Testing
Ongoing Accessibility Monitoring
Reporting / Analytics
Visualize Accessibility
WCAG Compliance

SEO Software

A/B Testing
Artificial Intelligence (AI)
Auditing
Competitor Analysis
Content Management
Dashboard
Google Analytics Integration
Keyword Research Tools
Keyword Tracking
Link Management
Localization
Mobile Search Tracking
Rank Tracking
Revenue Management
User Management

More CSS HTML Validator Categories

CSS HTML Validator Customer Reviews

Write a Review
  • Reviewer Name: Jim M.
    Position: Sole administrator
    Has used product for: 2+ Years
    Uses the product: Weekly
    Org Size (# of Employees): 1 - 25
    Feature Set
    Layout
    Ease Of Use
    Cost
    Customer Service
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Keeps your code clean

    Date: Jan 10 2025
    Summary

    I use it all the time, would not want to be without it. Having used it over the last five years, it is the easiest way of keeping your code clean and free of errors. By doing this, you make life easier for yourself in the long run. And you pick up errors before you upload them as live webpages.

    Positive

    I starting using this five years ago, and have not looked back since. It really is a one-stop shop for keeping your code free of any problems. By finding issues in your code, however minor they might seem, you can keep your code clean, and this leads to far fewer problems in the long run. Without it, minor issues aren't caught, but at some stage they accumulate and then you end up with a big mess which is much harder to sort out. Good support if you have any problems in implementation. Highly recommended.

    Negative

    Nothing. If I had any difficulty in implementing a particular option, I contacted support and the problem was sorted.

    Read More...
  • Reviewer Name: A Verified Reviewer
    Position: Volunteer serving Non-Profit Organizations
    Has used product for: 2+ Years
    Uses the product: Daily
    Org Size (# of Employees): 1 - 25
    Feature Set
    Layout
    Ease Of Use
    Cost
    Customer Service
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Superb Tool for Creating and Maintaining HTML, CSS, PHP, JavaScript, and More

    Date: Feb 05 2024
    Summary

    I first encountered CSS HTML Validator sometime around year 2000. Initially, I used the limited free version, but, as my reliance on HTML/CSS/JavaScript/PHP increased, I upgraded to the Home edition and then to Professional. In an era where much sophisticated technology is available as "freeware", there remain applications maintained by individuals that are well worth their upfront cost. CSS HTML Validator is such an app.

    Positive

    Excellent syntax checking that, in addition to locating errors, offers relevant targeted advice on correcting errors, best practices, accessibility, and SEO, making CSS HTML Validator a good tool when learning HTML, CSS, etc., and a sophisticated advisor even for an advanced practitioner. In addition to validating single HTML/CSS pages, it checks links and is able to process an entire website to generate a comprehensive analysis of all pages. The website can be local on the file system or online and accessed via a URL. The validator engine allows one to choose the level of error checking (Full, Errors only, Errors and warnings only, etc.) and enabling/disabling specific messages. The editor includes features specific to editing HTML and CSS pages. Validation includes JSON (in HTML pages) and WCAG (Web Content Accessibility Guidelines).

    Negative

    As with any product, various individuals will have various preferences, but, for myself, I am at a loss to suggest possible improvements. As one who runs Linux, the fact that CSS HTML Validator is a Windows-only application was a "con" (I ran it in a VM), but, as of Wine 9.0, all features of CSS HTML Validator perform flawlessly when installed on Linux with Wine.

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  • Reviewer Name: Gregory P.
    Position: Full Stack Developer
    Has used product for: 6-12 Months
    Uses the product: Weekly
    Org Size (# of Employees): 1 - 25
    Feature Set
    Layout
    Ease Of Use
    Cost
    Customer Service
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Best Validation software available for HTML/CSS/PHP

    Date: Jul 20 2022
    Summary

    Load and click validate. Messages are easy to follow to find your errors, Just make the fix and save, and re validate to check again.

    Positive

    Love the way it tells you the line and the error message. Makes troubleshooting very easy. Just open your file and click validate, just that easy.

    Negative

    Wish there was a lifetime price for upgrades, but am satisfied with the current pricing per version.

    Read More...
  • Reviewer Name: Allen M.
    Position: Owner/Developer
    Has used product for: 2+ Years
    Uses the product: Weekly
    Org Size (# of Employees): 1 - 25
    Feature Set
    Layout
    Ease Of Use
    Cost
    Customer Service
    Would you Recommend to Others?
    1 2 3 4 5 6 7 8 9 10

    Very helpful with old ASP.NET application I maintain

    Date: Jul 20 2022
    Summary

    This really fills a void trying to structure the pages in a modern HTML5 way. Required reworking them where they were out-of-date but this ensures they stay reasonably compliant. Saves a ton of time that way.

    Positive

    The ASPX pages are html nightmares for the most part. By testing the runtime manifestations against this product (in other words, grab the page source and drop it into this product), I can see a number of things that need to be addressed in the source - css, poor document structure
    The only limitation I have run into is that I need to embed css links in the pages explicitly instead of relying on the Telerik style sheet manager to organize and provide them to the app. It would be very helpful if a set of CSS stylesheets could be automatically searched and so on.

    Negative

    I am not sure why I get the starting panel offering me options on startup. Maybe it can be disabled. A bit annoying.

    Read More...
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