SEO Tools

A set of browser-based SEO utilities: meta tag, Open Graph, and Twitter Card checkers and generators, robots.txt and XML sitemap tools, HTTP header and redirect checks, on-page content analysis, and schema.org/JSON-LD structured data generators. Live checks fetch a page directly from your browser when the target site allows cross-origin requests; every checker also accepts pasted HTML or headers so it works on any page regardless of CORS. Everything runs locally, so nothing you paste is ever sent to a server.

Meta Tag Checker

Check a page's title, meta description, robots, viewport, and canonical tags for common SEO issues.

Meta Tag Generator

Generate a ready-to-paste <head> snippet with title, meta description, robots, viewport, and canonical tags.

Open Graph Checker

Check a page's Open Graph tags against the protocol's required set and catch a relative og:image URL.

Open Graph Generator

Generate a ready-to-paste og:* meta tag block for a page's social link preview.

Twitter Card Validator

Validate twitter:card tags and see which fields fall back to Open Graph when a twitter:* tag is missing.

Canonical URL Checker

Check a page's canonical tag for duplicates and flag a relative canonical URL Google may not resolve reliably.

Hreflang Tag Checker

Check a page's hreflang tags for duplicate values, invalid language codes, and a missing x-default entry.

Robots.txt Tester

Fetch or paste a robots.txt file and test whether a given path is allowed for a specific crawler.

Robots.txt Generator

Build a robots.txt file from rule groups and sitemap URLs, with one-click presets for common setups.

XML Sitemap Validator

Fetch or paste a sitemap.xml file and check it against the sitemaps.org protocol's structure and limits.

XML Sitemap Generator

Turn a plain list of URLs into a valid sitemap.xml file, with optional shared lastmod, changefreq, and priority.

Broken Link Checker

Paste or fetch a page's HTML, extract its links, and check each one's HTTP status from your browser.

Redirect Checker

Check whether a URL redirects, where it ends up, and trace the full multi-hop chain from a pasted curl -IL trace.

HTTP Header Checker

Fetch or paste a page's response headers and see every header categorized as Caching, Security, Content, or Other.

Security Headers Checker

Check a page's response headers against the six baseline security headers OWASP recommends, with an overall score.

Cache Header Checker

Fetch or paste response headers and get a plain-English explanation of Cache-Control directives, ETag, Expires, and Vary.

Keyword Density Checker

Analyze body text for single-keyword and 2-3 word phrase frequency, with a soft keyword-stuffing warning.

Heading Structure Analyzer

Fetch a page (or paste HTML) and get a nested H1-H6 outline, flagging missing H1s and heading-level skips.

Image Alt Tag Checker

Fetch a page (or paste HTML) and audit every <img> tag's alt attribute for missing, empty, or descriptive text.

Mobile-Friendliness Checker

Fetch a page (or paste HTML) and check viewport meta correctness plus weak signals of responsive CSS - HTML signals only, not a rendering test.

Core Web Vitals Report Analyzer

Paste PageSpeed Insights JSON and get LCP, CLS, INP/TBT, FCP and more graded against Google's published thresholds.

Google SERP Preview

Preview how a page's title and meta description will render as a Google search result, with live character counts.

UTM Builder

Build a campaign-tagged URL by appending utm_source, utm_medium, utm_campaign, and optional UTM parameters.

UTM Parser

Paste a URL and see every utm_* parameter it carries, plus other query params and the base URL with them stripped.

Structured Data Validator

Validate JSON-LD structured data against schema.org's required and recommended properties for common types.

Article Schema Generator

Generate paste-ready Article, NewsArticle, or BlogPosting JSON-LD from a form.

FAQ Schema Generator

Turn a list of questions and answers into paste-ready FAQPage JSON-LD.

Organization Schema Generator

Generate paste-ready Organization JSON-LD, including a social profile (sameAs) list and contact point.

Product Schema Generator

Generate paste-ready Product JSON-LD with a nested Offer and optional AggregateRating.

Review Schema Generator

Generate paste-ready Review JSON-LD for a Product, LocalBusiness, Book, Movie, or Recipe.

Breadcrumb Schema Generator

Turn an ordered list of page names and URLs into paste-ready BreadcrumbList JSON-LD.

Local Business Schema Generator

Generate paste-ready LocalBusiness JSON-LD with a nested address and opening-hours specification.