# Validate HTML

> Submits the HTML of the current tab to the W3C Validator. Source submitted is from a GET request not the DOM. Written out of the need to easily validate protected directories. Not advisable for use on pages with sensitive information.

Canonical page: [https://chrome-stats.com/d/validate-html](https://chrome-stats.com/d/validate-html)

## Overview

- **ID:** `validate-html`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Nathan Hernden
- **Category:** web-development
- **Daily users:** 59
- **Rating:** 3.00 / 5 (2 ratings)
- **Version:** 1.3.4resigned1
- **Last updated:** 2024-04-26
- **First published:** 2018-09-20
- **Size:** 15 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/validate-html/)

## Description

**Validate HTML** is a Chrome extension designed to streamline the process of validating the HTML of your current browser tab by submitting it directly to the W3C Validator. Unlike other validators that use the DOM, this tool sends the actual source code of the page through a GET request, making it particularly useful for validating pages within protected directories.

However, Validate HTML is not recommended for use on pages containing sensitive information, as it submits information via GET requests which may expose data unintentionally. This extension is ideal for developers and testers who need a quick, reliable way to check HTML without dealing with DOM-based submissions or protected content hassles. It simplifies ensuring that your web pages comply with W3C standards for improved web compatibility and accessibility.

## Rankings

- #15,017 — Overall
- #145 — html

## Permissions and access

### Permissions

- `activeTab`

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

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Source: [Chrome-Stats](https://chrome-stats.com/d/validate-html)