SEO Unmasked - The Ultimate Free SEO Extension SEO Unmasked is a 100% free, 100% local on-page SEO analyzer that runs entirely in your browser. Get instant, comprehensive SEO insights without paywalls, subscriptions, or sending data to external servers. Why Choose SEO Unmasked?

100% Free Forever — No premium tiers, no hidden paywalls, no account creation required. Full access to all features immediately.
100% Local & Offline — All analysis runs in your browser. Zero external API calls, zero data sent to servers. Your data never leaves your device.
All-in-One On-Page SEO Tool — From keyword analysis to schema generation, from PAA research to technical audits — everything you need in one place.
Privacy First — We track zero logs, store zero data externally, and never sell your information. What happens in your browser stays in your browser.

Unique Features PAA Scraper (People Also Ask) Extract questions directly from Google Search Results. Research what your audience is asking and create content that answers their queries. Schema Wizard Generate production-ready JSON-LD structured data through a guided interface. Create Schema for Products, Reviews, FAQs, Articles, and more — no coding required. Keyword Analysis

Primary keyword identification with relevance scoring
Keyword density calculator
Placement breakdown (title, URL, meta, headings, alt text)
Secondary keywords discovery

Run History Track your SEO progress over time. Each run saves your score locally, so you can see improvements or regressions with delta comparisons. Multi-Site Dashboard View and manage all your analyzed websites in one place. Compare scores across domains, access previous reports, and monitor overall SEO health. Core On-Page Analysis Instant SEO Score Get immediate A-F grades across Technical (50pts), Content (25pts), Performance (15pts), and Social (10pts) metrics. Know your page health at a glance. Technical Health

Meta tags (title, description, robots, canonical)
H1-H6 heading hierarchy with tree visualization
Language attribute and hreflang detection
XML Sitemap detection and analysis
Robots.txt rules extraction

Content & Keywords

Word count and readability scoring
Keyword density and placement analysis
SERP Preview (Desktop & Mobile) with accurate pixel truncation
Social tags (Open Graph, Twitter Cards)

Links & Images

Internal vs external link separation
Broken link detection (batch HTTP checking)
Nofollow, sponsored, and UGC attribute detection
Image alt text audit
Lazy loading and tracking pixel detection

Advanced Technical Features

Core Web Vitals — LCP, CLS, and INP metrics captured directly from the page
HTML vs DOM Diff — See exactly how much content JavaScript adds after initial load
Redirect Chain Tracing — Follow redirects up to 10 hops with full status code visibility
X-Robots-Tag Detection — Check HTTP headers for indexing instructions
JSON-LD Schema Viewer — Syntax-highlighted code viewer with rich snippet type detection (Product, Review, FAQ, Recipe, Event, Organization, and more)

Export & Integration

Export data as JSON or CSV
Generate formatted SEO reports
Copy individual data points to clipboard
Sticky panel mode for in-page analysis

Browser Support Available for Google Chrome and Mozilla Firefox. Install SEO Unmasked Today No sign-ups. No subscriptions. No data collection. Just powerful, instant SEO analysis — completely free.

ArchitW

Published Firefox add-ons:

SEO Unmasked

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