SEO Diagnostix

Tracking since May 22, 2026.

Changelog

• Jun 10, 2026
  description

  SEO Diagnostix: Detached Technical SEO Auditor & Visual Page Overlay
  
  Take full control of your technical SEO audits with SEO Diagnostix — a real-time page analyzer built for web developers, SEO professionals, and QA engineers.
  
  Unlike extensions that inject sidebars and clash with page CSS, SEO Diagnostix runs in a fully detached panel window. You get a clean, isolated interface to inspect search signals side-by-side at any viewport size, with zero layout interference.
  
  🚀 Why Install SEO Diagnostix?
  
  Zero layout disruption — The audit panel lives in a separate window, so it never conflicts with the host page's CSS or DOM.
  Instant visual DOM overlays — Link audits draw colored overlays on the page so you can spot redirects and broken links in seconds.
  Sitemap Discovery & Crawl — Discover every sitemap from robots.txt, validate XML integrity, detect duplicate <loc> entries across locale sitemaps, and crawl hundreds of URLs with rate-limit-aware pacing.
  Smart lazy-loading checker — Image audits auto-scroll to trigger lazy-loaded assets before scanning.
  Real-time HTTP validation — Canonical, hreflang, link, sitemap, and image URLs are checked for real HTTP status codes. CORS-blocked responses are clearly marked Unverifiable — never falsely reported as success.
  One-click export — Full Markdown report for tickets, or a self-contained HTML report with collapsible sections, table-of-contents, SERP preview, AI/GEO detail, and Sitemap appendix — opens offline.
  100% privacy & speed — No external servers, no tracking, no database. Everything runs locally in your browser.
  
  🛠️ Exhaustive Feature Set
  
  1. Overview & On-Page Metadata
  
  Meta title and description length checks (Google-aligned 120–160 char guidance for descriptions).
  Viewport, favicon, and meta keywords validation.
  Detects duplicate title/description and missing social tags.
  Keyword cross-check — When meta keywords are declared, verifies presence in title, H1, and URL.
  OG image validation — Checks reachability and recommended minimum dimensions (1200×630).
  
  2. 🔗 Canonical & Hreflang Auditor
  Extracts all <link rel="canonical"> and <link rel="alternate" hreflang="..."> tags.
  Resolves relative URLs to absolute paths with normalized comparison (no false mismatches from trailing slashes).
  Verifies HTTP status codes and flags self-referential hreflang gaps.
  Recommends x-default hreflang when alternate locales are present but no fallback is defined.
  
  3. 🟢 Progressive Link Auditor & Overlay Highlighter
  Scans all anchors in throttled batches to avoid rate-limiting.
  Internal vs external link breakdown in the audit summary.
  Page overlays:
  Green — Healthy links (2xx)
  Yellow — Redirects (3xx)
  Red — Broken links (404 / 5xx)
  Grey “Unverifiable” — CORS-blocked (status cannot be confirmed)
  Smart status cache for duplicate URLs.
  
  4. 🖼️ Image SEO & Alt-Text Checker
  Auto-scrolls to force lazy-loaded images into view.
  Parses srcset for highest-resolution sources.
  Flags missing, empty, generic placeholder alt text, and broken image URLs.
  
  5. 🤖 Robots & Directives Validator
  Parses <meta name="robots"> directives (noindex, nofollow, etc.).
  Fetches and analyzes robots.txt from the page origin on every audit.
  Warns on conflicts between meta robots and crawl rules.
  
  6. Heading Structure & Content Outline
  Full H1–H6 outline with distribution stats.
  Detects missing/multiple H1s, empty headings, hierarchy jumps, and length issues.
  Inline badges on problematic nodes in the heading tree.
  
  7. 📊 Structured Data & Schema.org Visualizer
  Detects and parses JSON-LD and Microdata (including multi-type @type arrays).
  Interactive schema instances with property checklists and validation warnings for Product, Article, Organization, BreadcrumbList, and more.
  
  8. Google SERP Preview
  Live preview of how the page may appear in Google search results (title, URL, description).
  
  9. 📱 Social Share Card Previewer
  Scans Open Graph and Twitter Card tags.
  Visual preview for Facebook, LinkedIn, and Twitter/X shares.
  
  10. AI Retrieval & Extractability (GEO)
  
  Evaluates page signals relevant to AI crawlers and answer engines: extractability, E-E-A-T hints, and known AI bot access patterns.
  Actionable warnings with expandable detail cards.
  
  11. 🗺️ Sitemap Discovery & Health (New)
  
  Automatically discovers all sitemaps from robots.txt and fallback paths. Validates XML integrity, checks HTTP status per sitemap, and reports total URLs per locale.
  
  Unique: detects duplicate <loc> entries within a single sitemap (intra-file) and across multiple locale sitemaps (cross-file) — with a full drill-down detail pane and CSV export. No other free browser extension does this.
  
  12. 🔍 Sitemap URL Tester (New)
  
  Inspect and batch-crawl any sitemap XML with live progress. Checks HTTP status for every URL, captures full redirect chains, and exports results as CSV or JSON.
  
  Rate-limit aware: automatic 403/429 backoff with retry queue and tiered pacing for large enterprise sitemaps — won't get blocked by WAFs. Pause and stop at any time.
  
  👥 Who is this for?
  
  SEO specialists — Catch canonical bugs, hreflang gaps, robots conflicts, and schema errors on staging or production.
  Web developers — Validate releases: metadata, headings, structured data, and link health in one pass.
  QA & test engineers — Find broken links and image issues visually, without digging through DevTools.
  Content editors — Final pre-publish scan for links, alt text, social cards, and SERP presentation.
  
  🔒 Privacy & Safety Guarantee
  This extension is built with your privacy in mind:
  
  No Telemetry / No Tracking: We do not monitor your browsing behavior or collect usage metrics.
  
  No Database Logging: Audit results exist only in the temporary panel window memory and disappear when closed.
  
  Local Operation: Direct browser-to-server requests are used for HTTP verification, with zero intermediary proxy servers.
  
  Privacy Policy - https://gist.github.com/mbatra5/ae695d34a406fffa6f03f2a6558a6349
  
  ---
  v1.3.2 Update:
  • Fixed status 0 errors on cross-origin hreflang checks.
  • Fixed status badge layout (prevented badge stretching) and enabled URL wrapping in the results tables.
  • Footer version 1.3.2

  SEO Diagnostix: Detached Technical SEO Auditor & Visual Page Overlay
  
  Take full control of your technical SEO audits with SEO Diagnostix — a real-time page analyzer built for web developers, SEO professionals, and QA engineers.
  
  Unlike extensions that inject sidebars and clash with page CSS, SEO Diagnostix runs in a fully detached panel window. You get a clean, isolated interface to inspect search signals side-by-side at any viewport size, with zero layout interference.
  
  🚀 Why Install SEO Diagnostix?
  
  Zero layout disruption — The audit panel lives in a separate window, so it never conflicts with the host page's CSS or DOM.
  Instant visual DOM overlays — Link audits draw colored overlays on the page so you can spot redirects and broken links in seconds.
  Sitemap Discovery & Crawl — Discover every sitemap from robots.txt, validate XML integrity, detect duplicate <loc> entries across locale sitemaps, and crawl hundreds of URLs with rate-limit-aware pacing.
  Smart lazy-loading checker — Image audits auto-scroll to trigger lazy-loaded assets before scanning.
  Real-time HTTP validation — Canonical, hreflang, link, sitemap, and image URLs are checked for real HTTP status codes. CORS-blocked responses are clearly marked Unverifiable — never falsely reported as success.
  One-click export — Full Markdown report for tickets, or a self-contained HTML report with collapsible sections, table-of-contents, SERP preview, AI/GEO detail, and Sitemap appendix — opens offline.
  100% privacy & speed — No external servers, no tracking, no database. Everything runs locally in your browser.
  
  🛠️ Exhaustive Feature Set
  
  1. Overview & On-Page Metadata
  
  Meta title and description length checks (Google-aligned 120–160 char guidance for descriptions).
  Viewport, favicon, and meta keywords validation.
  Detects duplicate title/description and missing social tags.
  Keyword cross-check — When meta keywords are declared, verifies presence in title, H1, and URL.
  OG image validation — Checks reachability and recommended minimum dimensions (1200×630).
  
  2. 🔗 Canonical & Hreflang Auditor
  Extracts all <link rel="canonical"> and <link rel="alternate" hreflang="..."> tags.
  Resolves relative URLs to absolute paths with normalized comparison (no false mismatches from trailing slashes).
  Verifies HTTP status codes and flags self-referential hreflang gaps.
  Recommends x-default hreflang when alternate locales are present but no fallback is defined.
  
  3. 🟢 Progressive Link Auditor & Overlay Highlighter
  Scans all anchors in throttled batches to avoid rate-limiting.
  Internal vs external link breakdown in the audit summary.
  Page overlays:
  Green — Healthy links (2xx)
  Yellow — Redirects (3xx)
  Red — Broken links (404 / 5xx)
  Grey “Unverifiable” — CORS-blocked (status cannot be confirmed)
  Smart status cache for duplicate URLs.
  
  4. 🖼️ Image SEO & Alt-Text Checker
  Auto-scrolls to force lazy-loaded images into view.
  Parses srcset for highest-resolution sources.
  Flags missing, empty, generic placeholder alt text, and broken image URLs.
  
  5. 🤖 Robots & Directives Validator
  Parses <meta name="robots"> directives (noindex, nofollow, etc.).
  Fetches and analyzes robots.txt from the page origin on every audit.
  Warns on conflicts between meta robots and crawl rules.
  
  6. Heading Structure & Content Outline
  Full H1–H6 outline with distribution stats.
  Detects missing/multiple H1s, empty headings, hierarchy jumps, and length issues.
  Inline badges on problematic nodes in the heading tree.
  
  7. 📊 Structured Data & Schema.org Visualizer
  Detects and parses JSON-LD and Microdata (including multi-type @type arrays).
  Interactive schema instances with property checklists and validation warnings for Product, Article, Organization, BreadcrumbList, and more.
  
  8. Google SERP Preview
  Live preview of how the page may appear in Google search results (title, URL, description).
  
  9. 📱 Social Share Card Previewer
  Scans Open Graph and Twitter Card tags.
  Visual preview for Facebook, LinkedIn, and Twitter/X shares.
  
  10. AI Retrieval & Extractability (GEO)
  
  Evaluates page signals relevant to AI crawlers and answer engines: extractability, E-E-A-T hints, and known AI bot access patterns.
  Actionable warnings with expandable detail cards.
  
  11. 🗺️ Sitemap Discovery & Health (New)
  
  Automatically discovers all sitemaps from robots.txt and fallback paths. Validates XML integrity, checks HTTP status per sitemap, and reports total URLs per locale.
  
  Unique: detects duplicate <loc> entries within a single sitemap (intra-file) and across multiple locale sitemaps (cross-file) — with a full drill-down detail pane and CSV export. No other free browser extension does this.
  
  12. 🔍 Sitemap URL Tester (New)
  
  Inspect and batch-crawl any sitemap XML with live progress. Checks HTTP status for every URL, captures full redirect chains, and exports results as CSV or JSON.
  
  Rate-limit aware: automatic 403/429 backoff with retry queue and tiered pacing for large enterprise sitemaps — won't get blocked by WAFs. Pause and stop at any time.
  
  👥 Who is this for?
  
  SEO specialists — Catch canonical bugs, hreflang gaps, robots conflicts, and schema errors on staging or production.
  Web developers — Validate releases: metadata, headings, structured data, and link health in one pass.
  QA & test engineers — Find broken links and image issues visually, without digging through DevTools.
  Content editors — Final pre-publish scan for links, alt text, social cards, and SERP presentation.
  
  🔒 Privacy & Safety Guarantee
  This extension is built with your privacy in mind:
  
  No Telemetry / No Tracking: We do not monitor your browsing behavior or collect usage metrics.
  
  No Database Logging: Audit results exist only in the temporary panel window memory and disappear when closed.
  
  Local Operation: Direct browser-to-server requests are used for HTTP verification, with zero intermediary proxy servers.
  
  Privacy Policy - https://gist.github.com/mbatra5/ae695d34a406fffa6f03f2a6558a6349
  
  ---
  v1.3.3 Update:
  • Fixed sitemap links redirect chaining & added the chain to details column.

• Jun 4, 2026
  description

  SEO Diagnostix: Detached Technical SEO Auditor & Visual Page Overlay
  
  Take full control of your technical SEO audits with SEO Diagnostix — a real-time page analyzer built for web developers, SEO professionals, and QA engineers.
  
  Unlike extensions that inject sidebars and clash with page CSS, SEO Diagnostix runs in a fully detached panel window. You get a clean, isolated interface to inspect search signals side-by-side at any viewport size, with zero layout interference.
  
  🚀 Why Install SEO Diagnostix?
  
  Zero layout disruption — The audit panel lives in a separate window, so it never conflicts with the host page’s CSS or DOM.
  Instant visual DOM overlays — Link audits draw colored overlays on the page so you can spot redirects and broken links in seconds.
  Smart lazy-loading checker — Image audits auto-scroll to trigger lazy-loaded assets before scanning.
  Real-time HTTP validation — Canonical, hreflang, link, and image URLs are checked for real HTTP status codes (200, 301, 404, etc.). CORS-blocked responses are clearly marked Unverifiable — never falsely reported as success.
  One-click Markdown export — Copy a full audit report (metadata, headings, schema, links, images, AI-GEO) to your clipboard for tickets or client handoffs.
  100% privacy & speed — No external servers, no tracking, no database. Everything runs locally in your browser.
  
  🛠️ Exhaustive Feature Set
  
  1. Overview & On-Page Metadata
  
  Meta title and description length checks (Google-aligned 120–160 char guidance for descriptions).
  Viewport, favicon, and meta keywords validation.
  Detects duplicate title/description and missing social tags.
  Keyword cross-check — When meta keywords are declared, verifies presence in title, H1, and URL.
  OG image validation — Checks reachability and recommended minimum dimensions (1200×630).
  
  2. 🔗 Canonical & Hreflang Auditor
  Extracts all <link rel="canonical"> and <link rel="alternate" hreflang="..."> tags.
  Resolves relative URLs to absolute paths with normalized comparison (no false mismatches from trailing slashes).
  Verifies HTTP status codes and flags self-referential hreflang gaps.
  Recommends x-default hreflang when alternate locales are present but no fallback is defined.
  
  3. 🟢 Progressive Link Auditor & Overlay Highlighter
  Scans all anchors in throttled batches to avoid rate-limiting.
  Internal vs external link breakdown in the audit summary.
  Page overlays:
  Green — Healthy links (2xx)
  Yellow — Redirects (3xx)
  Red — Broken links (404 / 5xx)
  Grey “Unverifiable” — CORS-blocked (status cannot be confirmed)
  Smart status cache for duplicate URLs.
  
  4. 🖼️ Image SEO & Alt-Text Checker
  Auto-scrolls to force lazy-loaded images into view.
  Parses srcset for highest-resolution sources.
  Flags missing, empty, generic placeholder alt text, and broken image URLs.
  
  5. 🤖 Robots & Directives Validator
  Parses <meta name="robots"> directives (noindex, nofollow, etc.).
  Fetches and analyzes robots.txt from the page origin on every audit.
  Warns on conflicts between meta robots and crawl rules.
  
  6. Heading Structure & Content Outline
  Full H1–H6 outline with distribution stats.
  Detects missing/multiple H1s, empty headings, hierarchy jumps, and length issues.
  Inline badges on problematic nodes in the heading tree.
  
  7. 📊 Structured Data & Schema.org Visualizer
  Detects and parses JSON-LD and Microdata (including multi-type @type arrays).
  Interactive schema instances with property checklists and validation warnings for Product, Article, Organization, BreadcrumbList, and more.
  
  8. Google SERP Preview
  Live preview of how the page may appear in Google search results (title, URL, description).
  
  9. 📱 Social Share Card Previewer
  Scans Open Graph and Twitter Card tags.
  Visual preview for Facebook, LinkedIn, and Twitter/X shares.
  
  10. AI Retrieval & Extractability (GEO)
  
  Evaluates page signals relevant to AI crawlers and answer engines: extractability, E-E-A-T hints, and known AI bot access patterns.
  Actionable warnings with expandable detail cards.
  
  👥 Who is this for?
  
  SEO specialists — Catch canonical bugs, hreflang gaps, robots conflicts, and schema errors on staging or production.
  Web developers — Validate releases: metadata, headings, structured data, and link health in one pass.
  QA & test engineers — Find broken links and image issues visually, without digging through DevTools.
  Content editors — Final pre-publish scan for links, alt text, social cards, and SERP presentation.
  
  🔒 Privacy & Safety Guarantee
  This extension is built with your privacy in mind:
  
  No Telemetry / No Tracking: We do not monitor your browsing behavior or collect usage metrics.
  
  No Database Logging: Audit results exist only in the temporary panel window memory and disappear when closed.
  
  Local Operation: Direct browser-to-server requests are used for HTTP verification, with zero intermediary proxy servers.
  
  Privacy Policy - https://gist.github.com/mbatra5/ae695d34a406fffa6f03f2a6558a6349

  SEO Diagnostix: Detached Technical SEO Auditor & Visual Page Overlay
  
  Take full control of your technical SEO audits with SEO Diagnostix — a real-time page analyzer built for web developers, SEO professionals, and QA engineers.
  
  Unlike extensions that inject sidebars and clash with page CSS, SEO Diagnostix runs in a fully detached panel window. You get a clean, isolated interface to inspect search signals side-by-side at any viewport size, with zero layout interference.
  
  🚀 Why Install SEO Diagnostix?
  
  Zero layout disruption — The audit panel lives in a separate window, so it never conflicts with the host page's CSS or DOM.
  Instant visual DOM overlays — Link audits draw colored overlays on the page so you can spot redirects and broken links in seconds.
  Sitemap Discovery & Crawl — Discover every sitemap from robots.txt, validate XML integrity, detect duplicate <loc> entries across locale sitemaps, and crawl hundreds of URLs with rate-limit-aware pacing.
  Smart lazy-loading checker — Image audits auto-scroll to trigger lazy-loaded assets before scanning.
  Real-time HTTP validation — Canonical, hreflang, link, sitemap, and image URLs are checked for real HTTP status codes. CORS-blocked responses are clearly marked Unverifiable — never falsely reported as success.
  One-click export — Full Markdown report for tickets, or a self-contained HTML report with collapsible sections, table-of-contents, SERP preview, AI/GEO detail, and Sitemap appendix — opens offline.
  100% privacy & speed — No external servers, no tracking, no database. Everything runs locally in your browser.
  
  🛠️ Exhaustive Feature Set
  
  1. Overview & On-Page Metadata
  
  Meta title and description length checks (Google-aligned 120–160 char guidance for descriptions).
  Viewport, favicon, and meta keywords validation.
  Detects duplicate title/description and missing social tags.
  Keyword cross-check — When meta keywords are declared, verifies presence in title, H1, and URL.
  OG image validation — Checks reachability and recommended minimum dimensions (1200×630).
  
  2. 🔗 Canonical & Hreflang Auditor
  Extracts all <link rel="canonical"> and <link rel="alternate" hreflang="..."> tags.
  Resolves relative URLs to absolute paths with normalized comparison (no false mismatches from trailing slashes).
  Verifies HTTP status codes and flags self-referential hreflang gaps.
  Recommends x-default hreflang when alternate locales are present but no fallback is defined.
  
  3. 🟢 Progressive Link Auditor & Overlay Highlighter
  Scans all anchors in throttled batches to avoid rate-limiting.
  Internal vs external link breakdown in the audit summary.
  Page overlays:
  Green — Healthy links (2xx)
  Yellow — Redirects (3xx)
  Red — Broken links (404 / 5xx)
  Grey “Unverifiable” — CORS-blocked (status cannot be confirmed)
  Smart status cache for duplicate URLs.
  
  4. 🖼️ Image SEO & Alt-Text Checker
  Auto-scrolls to force lazy-loaded images into view.
  Parses srcset for highest-resolution sources.
  Flags missing, empty, generic placeholder alt text, and broken image URLs.
  
  5. 🤖 Robots & Directives Validator
  Parses <meta name="robots"> directives (noindex, nofollow, etc.).
  Fetches and analyzes robots.txt from the page origin on every audit.
  Warns on conflicts between meta robots and crawl rules.
  
  6. Heading Structure & Content Outline
  Full H1–H6 outline with distribution stats.
  Detects missing/multiple H1s, empty headings, hierarchy jumps, and length issues.
  Inline badges on problematic nodes in the heading tree.
  
  7. 📊 Structured Data & Schema.org Visualizer
  Detects and parses JSON-LD and Microdata (including multi-type @type arrays).
  Interactive schema instances with property checklists and validation warnings for Product, Article, Organization, BreadcrumbList, and more.
  
  8. Google SERP Preview
  Live preview of how the page may appear in Google search results (title, URL, description).
  
  9. 📱 Social Share Card Previewer
  Scans Open Graph and Twitter Card tags.
  Visual preview for Facebook, LinkedIn, and Twitter/X shares.
  
  10. AI Retrieval & Extractability (GEO)
  
  Evaluates page signals relevant to AI crawlers and answer engines: extractability, E-E-A-T hints, and known AI bot access patterns.
  Actionable warnings with expandable detail cards.
  
  11. 🗺️ Sitemap Discovery & Health (New)
  
  Automatically discovers all sitemaps from robots.txt and fallback paths. Validates XML integrity, checks HTTP status per sitemap, and reports total URLs per locale.
  
  Unique: detects duplicate <loc> entries within a single sitemap (intra-file) and across multiple locale sitemaps (cross-file) — with a full drill-down detail pane and CSV export. No other free browser extension does this.
  
  12. 🔍 Sitemap URL Tester (New)
  
  Inspect and batch-crawl any sitemap XML with live progress. Checks HTTP status for every URL, captures full redirect chains, and exports results as CSV or JSON.
  
  Rate-limit aware: automatic 403/429 backoff with retry queue and tiered pacing for large enterprise sitemaps — won't get blocked by WAFs. Pause and stop at any time.
  
  👥 Who is this for?
  
  SEO specialists — Catch canonical bugs, hreflang gaps, robots conflicts, and schema errors on staging or production.
  Web developers — Validate releases: metadata, headings, structured data, and link health in one pass.
  QA & test engineers — Find broken links and image issues visually, without digging through DevTools.
  Content editors — Final pre-publish scan for links, alt text, social cards, and SERP presentation.
  
  🔒 Privacy & Safety Guarantee
  This extension is built with your privacy in mind:
  
  No Telemetry / No Tracking: We do not monitor your browsing behavior or collect usage metrics.
  
  No Database Logging: Audit results exist only in the temporary panel window memory and disappear when closed.
  
  Local Operation: Direct browser-to-server requests are used for HTTP verification, with zero intermediary proxy servers.
  
  Privacy Policy - https://gist.github.com/mbatra5/ae695d34a406fffa6f03f2a6558a6349
  
  ---
  v1.3.2 Update:
  • Fixed status 0 errors on cross-origin hreflang checks.
  • Fixed status badge layout (prevented badge stretching) and enabled URL wrapping in the results tables.
  • Footer version 1.3.2

• Jun 4, 2026
  short_description

  Technical SEO auditor: canonical, hreflang, headings, links, robots, Schema.org, SERP preview & AI-GEO.

  Technical SEO auditor: sitemap crawl, canonical, hreflang, links, robots, Schema.org, SERP & AI-GEO.

• Jun 4, 2026
  permissions

  activeTab, scripting

  activeTab, scripting, webRequest

• May 28, 2026
  description

  SEO Diagnostix: Detached Technical SEO Auditor & Visual Page Overlay
  
  Take full control of your technical SEO audits with SEO Diagnostix, a premium, real-time page analyzer built specifically for web developers, SEO professionals, and QA engineers.
  
  Unlike traditional browser extensions that inject cluttered sidebars and disrupt your page's CSS, SEO Diagnostix runs in a fully detached panel window. This gives you a clean, isolated interface to inspect critical search engine signals side-by-side at any viewport size without layout interference.
  
  🚀 Why Install SEO Diagnostix?
  
  Zero Layout Disruption: Because the audit panel runs in a completely separate window, it never conflicts with the host page’s CSS/DOM, allowing you to test mobile responsive layouts and desktop viewports side-by-side.
  Instant Visual Dom Overlays: See link health at a glance. The extension dynamically overlays transparent colored borders and backgrounds directly onto active links so you can visually pinpoint redirects and broken links in seconds.
  Smart Lazy-Loading Checker: Image audits auto-scroll the page to trigger lazy-loaded assets before scanning, ensuring you audit what search bots actually see.
  Real-Time HTTP Validation: Instead of just reading tag content, SEO Diagnostix queries page URLs, canonical addresses, alternates, and image targets behind the scenes, verifying exact HTTP status codes (200, 301, 404, CORS) dynamically.
  100% Privacy & Speed: No external servers, no tracking, and no database persistence. Everything runs locally in your browser for maximum speed and security.
  
  🛠️ Exhaustive Feature Set
  
  1. 🔗 Canonical & Hreflang Auditor
  Extracts all <link rel="canonical"> and <link rel="alternate" hreflang="..."> tags.
  Automatically resolves relative URLs to absolute paths.
  Verifies HTTP response codes and flags indexing conflicts like self-referential mismatches or canonical loops.
  
  2. 🟢 Progressive Link Auditor & Overlay Highlighter
  Scans all anchors on the active tab, auditing them in throttled concurrency batches of 10 to prevent rate-limiting.
  Highlights links directly on the page:
  Green Overlay: Healthy, direct links (200 OK).
  Yellow Overlay: Redirected links (3xx).
  Red Overlay: Dead or broken links (404 / 5xx).
  Uses a smart status cache to avoid query redundancy on duplicate links.
  
  3. 🖼️ Image SEO & Alt-Text Checker
  Auto-scrolls the page down and up to force rendering of lazy-loaded images.
  Parses candidate srcset strings to identify the highest resolution source.
  Checks for missing or empty alt attributes, generic placeholder alt tags (e.g. "image", "logo"), and checks if image source files return HTTP errors.
  
  4. 🤖 Robots & Directives Validator
  Scans <meta name="robots"> tags for indexation instructions.
  Simulates search crawler permissions to identify conflicts between headers and on-page metadata.
  
  5. 📊 Structured Data & Schema.org Visualizer
  Detects and parses all JSON-LD and Microdata structured schemas.
  Unrolls nested hierarchies into clear, interactive key-value tables, making schema auditing simple.
  
  6. 📱 Social Share Card Previewer
  Scans all Open Graph (og:) and Twitter Card metadata tags.
  Displays a live, visual preview of how your page will look when shared on Facebook, LinkedIn, or Twitter.
  
  👥 Who is this for?
  
  SEO Specialists: Quickly identify canonical bugs, alternate locale mismatches, and redirect issues on staging or production.
  
  Web Developers: Audit new code releases and verify structured schema configurations instantly.
  QA & Test Engineers: Locate broken links and missing image attributes visually without looking at dev tools console logs.
  
  Content Editors: Run a final scan to verify all external links, alt tags, and social cards before publishing.
  
  🔒 Privacy & Safety Guarantee
  This extension is built with your privacy in mind:
  
  No Telemetry / No Tracking: We do not monitor your browsing behavior or collect usage metrics.
  
  No Database Logging: Audit results exist only in the temporary panel window memory and disappear when closed.
  
  Local Operation: Direct browser-to-server requests are used for HTTP verification, with zero intermediary proxy servers.

  SEO Diagnostix: Detached Technical SEO Auditor & Visual Page Overlay
  
  Take full control of your technical SEO audits with SEO Diagnostix — a real-time page analyzer built for web developers, SEO professionals, and QA engineers.
  
  Unlike extensions that inject sidebars and clash with page CSS, SEO Diagnostix runs in a fully detached panel window. You get a clean, isolated interface to inspect search signals side-by-side at any viewport size, with zero layout interference.
  
  🚀 Why Install SEO Diagnostix?
  
  Zero layout disruption — The audit panel lives in a separate window, so it never conflicts with the host page’s CSS or DOM.
  Instant visual DOM overlays — Link audits draw colored overlays on the page so you can spot redirects and broken links in seconds.
  Smart lazy-loading checker — Image audits auto-scroll to trigger lazy-loaded assets before scanning.
  Real-time HTTP validation — Canonical, hreflang, link, and image URLs are checked for real HTTP status codes (200, 301, 404, etc.). CORS-blocked responses are clearly marked Unverifiable — never falsely reported as success.
  One-click Markdown export — Copy a full audit report (metadata, headings, schema, links, images, AI-GEO) to your clipboard for tickets or client handoffs.
  100% privacy & speed — No external servers, no tracking, no database. Everything runs locally in your browser.
  
  🛠️ Exhaustive Feature Set
  
  1. Overview & On-Page Metadata
  
  Meta title and description length checks (Google-aligned 120–160 char guidance for descriptions).
  Viewport, favicon, and meta keywords validation.
  Detects duplicate title/description and missing social tags.
  Keyword cross-check — When meta keywords are declared, verifies presence in title, H1, and URL.
  OG image validation — Checks reachability and recommended minimum dimensions (1200×630).
  
  2. 🔗 Canonical & Hreflang Auditor
  Extracts all <link rel="canonical"> and <link rel="alternate" hreflang="..."> tags.
  Resolves relative URLs to absolute paths with normalized comparison (no false mismatches from trailing slashes).
  Verifies HTTP status codes and flags self-referential hreflang gaps.
  Recommends x-default hreflang when alternate locales are present but no fallback is defined.
  
  3. 🟢 Progressive Link Auditor & Overlay Highlighter
  Scans all anchors in throttled batches to avoid rate-limiting.
  Internal vs external link breakdown in the audit summary.
  Page overlays:
  Green — Healthy links (2xx)
  Yellow — Redirects (3xx)
  Red — Broken links (404 / 5xx)
  Grey “Unverifiable” — CORS-blocked (status cannot be confirmed)
  Smart status cache for duplicate URLs.
  
  4. 🖼️ Image SEO & Alt-Text Checker
  Auto-scrolls to force lazy-loaded images into view.
  Parses srcset for highest-resolution sources.
  Flags missing, empty, generic placeholder alt text, and broken image URLs.
  
  5. 🤖 Robots & Directives Validator
  Parses <meta name="robots"> directives (noindex, nofollow, etc.).
  Fetches and analyzes robots.txt from the page origin on every audit.
  Warns on conflicts between meta robots and crawl rules.
  
  6. Heading Structure & Content Outline
  Full H1–H6 outline with distribution stats.
  Detects missing/multiple H1s, empty headings, hierarchy jumps, and length issues.
  Inline badges on problematic nodes in the heading tree.
  
  7. 📊 Structured Data & Schema.org Visualizer
  Detects and parses JSON-LD and Microdata (including multi-type @type arrays).
  Interactive schema instances with property checklists and validation warnings for Product, Article, Organization, BreadcrumbList, and more.
  
  8. Google SERP Preview
  Live preview of how the page may appear in Google search results (title, URL, description).
  
  9. 📱 Social Share Card Previewer
  Scans Open Graph and Twitter Card tags.
  Visual preview for Facebook, LinkedIn, and Twitter/X shares.
  
  10. AI Retrieval & Extractability (GEO)
  
  Evaluates page signals relevant to AI crawlers and answer engines: extractability, E-E-A-T hints, and known AI bot access patterns.
  Actionable warnings with expandable detail cards.
  
  👥 Who is this for?
  
  SEO specialists — Catch canonical bugs, hreflang gaps, robots conflicts, and schema errors on staging or production.
  Web developers — Validate releases: metadata, headings, structured data, and link health in one pass.
  QA & test engineers — Find broken links and image issues visually, without digging through DevTools.
  Content editors — Final pre-publish scan for links, alt text, social cards, and SERP presentation.
  
  🔒 Privacy & Safety Guarantee
  This extension is built with your privacy in mind:
  
  No Telemetry / No Tracking: We do not monitor your browsing behavior or collect usage metrics.
  
  No Database Logging: Audit results exist only in the temporary panel window memory and disappear when closed.
  
  Local Operation: Direct browser-to-server requests are used for HTTP verification, with zero intermediary proxy servers.
  
  Privacy Policy - https://gist.github.com/mbatra5/ae695d34a406fffa6f03f2a6558a6349

• May 28, 2026
  short_description

  Technical SEO auditor: canonical & hreflang checks, link/image audits, robots, Schema.org, and social share previews.

  Technical SEO auditor: canonical, hreflang, headings, links, robots, Schema.org, SERP preview & AI-GEO.

Permissions & access

Permissions

activeTabscriptingwebRequest

Host access

http://*/*, https://*/*

Screenshots