HTML Validation
The HTML Validation Plugin runs in the background, identifies and reports HTML validation errors on your website. Once activated, the HTML Validation plugin uses WordPress cron to scan your website content in the…
Use with caution
HTML Validation works, but test it on a staging site before relying on it in 2026. It runs on 300+ sites, is rated 1/5 and was last updated 2 months ago, and scores 60/100 on our health check.
- Tested with the latest WordPress (7.1)
- Small user base (300+ active installs)
- Very few reviews so far
How does it stack up?
Side-by-side on installs, updates, ratings & supportDaily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where HTML Validation stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| accessibility | >100 |
| code validation | #20 |
| html validation | #5 |
| html validator | #2 |
| markup validation | #3 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 1 from 1 reviews
About HTML Validation
From the official readme · v1.0.17Description
The HTML Validation Plugin runs in the background, identifies and reports HTML validation errors on your website. Once activated, the HTML Validation plugin uses WordPress cron to scan your website content in the background. A progress bar on the report screen indicates scan progress. HTML Validation is provided by Validator.nu. Please refer to the provided privacy policy and terms of use. Posts may also be scanned using the Validate HTML link provided on the “All Posts” screen.
The HTML Validation Pro extension adds options to automatically correct many HTML Validation issues. This one of a kind plugin could save you hundreds of hours of work finding and correcting HTML validation issues. Visit our website to learn more and add the Pro Extension
Installation
- Upload the html-validation folder to the
/wp-content/plugins/directory, or install the plugin through the WordPress plugins screen directly. - Activate the plugin through the ‘Plugins’ screen in WordPress
Changelog
- 1.0.17
- misc updates to ensure compatibility with pro version
- 1.0.16
- corrected PHP warning for undefined variable
- 1.0.15
- Corrected php warnings
- 1.0.14
- Corrected csrf vulnerability
- 1.0.13
- Corrected validate link not working when linkid is not present in link table
- Corrected pagination not working when validate is passed through the url
- 1.0.12
- corrected recheck not working when validate html link is used to start a validation checks
- corrected unescaped output values
- 1.0.11
- added function to delete tables when a multisite blog is removed
- 1.0.10
- corrected php warnings on settings page
- increased database field sizes on id fields
- corrected bug in duplicate error ignore feature
- added notice when processing ignore or recheck on error screen
- added ada issue notice for empty option tags
1.0.9
- corrected ignored content list not being updated on settings page
1.0.8
- corrected filtered error results resetting when changing pages
- corrected filtered error results resetting when rechecking a page
1.0.7
- changed default cron frequency
1.0.6
- added indicator for minumum settings to be reviewed and adjusted
1.0.5
- added support for filtering ada errors in report
- updated link inventory to include term id to support ada compliance scans
- corrected bug resulting in multiple cron hooks being scheduled for initial scan
1.0.4
- corrected bug resulting in term errors being purged
- reset scan flag on purge to trigger faster validation checks on initial scan
- improved input validation
For developers
Is this your plugin? Show off the numbers.
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Best HTML Validation alternatives
All accessibility plugins →FAQ
HTML Validation: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Oct 22, 2026
Is HTML Validation free?
Yes. HTML Validation is free to download and use from the official WordPress.org plugin directory.
Is HTML Validation safe to use in 2026?
HTML Validation works, but test it on a staging site before relying on it in 2026. It runs on 300+ sites, is rated 1/5 and was last updated 2 months ago, and scores 60/100 on our health check.
How many websites use HTML Validation?
HTML Validation is active on 300+ WordPress websites and has been downloaded 9,853 times since it launched in November 2020. It was downloaded 139 times in the last 30 days.
Does HTML Validation work with WordPress 7.1?
Yes. The developer has tested HTML Validation up to WordPress 7.1.3, the latest release. It requires WordPress 4.6 or newer.
What PHP version does HTML Validation need?
HTML Validation requires PHP 5.5 or higher. Most hosts run PHP 8.x today, so it works on any modern WordPress hosting.
When was HTML Validation last updated?
The latest version, 1.0.17, was released on August 16, 2026 (2 months ago).
Who makes HTML Validation?
HTML Validation is developed and maintained by seshelby.
What are the best alternatives to HTML Validation?
The most popular alternatives to HTML Validation are Web Accessibility (formally… (500K+ installs), Auto Image Attributes From… (100K+ installs) and Accessibility by UserWay (80K+ installs).
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