SEO Unmasked

A fast, offline, 100% free tool that tells you exactly what is wrong with your page's SEO.

Technical Audit

SEO Unmasked scans your page for over 50 technical flags that agencies typically charge thousands to identify. It runs entirely in your browser, ensuring total privacy.

Indexing & Robots

Robots Meta

Detects index, noindex, follow, and nofollow directives in the DOM.

X-Robots-Tag

Intercepts HTTP headers to surface invisible server-level directives that can silently hide your site from Google.

Content & Media

We analyze the document's structure to ensure it's crawlable and accessible.

Heading Hierarchy: Validates H1–H6 nesting and flags missing or duplicate H1 tags.
Image Audit: Identifies missing alt text, improperly sized images, and lazy-loading issues.
Readability: Calculates word counts and readability scores based on body text alone (excluding navigation/header).

JavaScript SEO (DOM Diffing)

This is the most critical check for modern web apps. SEO Unmasked captures the raw server-side HTML then compares it to the final rendered DOM.

If your rendered DOM is significantly larger than your raw HTML, your site is client-side rendered (CSR). Googlebot may struggle to index this content.

SERP Preview

Stop guessing how your page looks in search results. Our SERP Preview uses pixel-accurate measurements (not just character counts) to show exactly where your titles and descriptions will truncate.

Preview Modes

Mobile: Simulates the 600px mobile viewport truncation.
Desktop: Shows the 580px desktop pixel boundary.