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HTML Validator

Developer

Validate HTML markup and catch missing tags, deprecated elements, and accessibility issues.

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Quick answers for HTML Validator

What does the HTML Validator do?
Validate HTML markup and catch missing tags, deprecated elements, and accessibility issues. The HTML Validator is one of 900+ free developer tools on Toolblip - all open to use without a signup.
How do I use the HTML Validator?
Open the HTML Validator on this page, paste or upload your input, and the result updates as you type. Use the copy button to grab the output, or adjust options to tune the result. Nothing you enter leaves your browser.
Is the HTML Validator free to use?
Yes. The HTML Validator is a free online tool on Toolblip - no signup, no account, no hidden usage limits. It runs in your browser and works on desktop and mobile.
Is the HTML Validator safe and private?
Yes. The HTML Validator processes your data entirely client-side, so nothing you paste is uploaded or stored on any server. It's safe to use with internal snippets, private keys for debugging, or any other sensitive content you'd rather not send to a remote service.
Do I need to install anything to use the HTML Validator?
No. The HTML Validator runs entirely in your browser - no downloads, no accounts, no API keys. Paste your input, get the output, copy it back into your editor.
Can I use the HTML Validator offline?
Once the page has loaded, the HTML Validator continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.