Free SEO Checker Tools

Browse this focused collection of free tools and checkers.

Category Landing Page

Free SEO Checker Tools

Explore free checker tools for metadata, redirects, sitemap, robots.txt, indexability, status codes, schema, and technical SEO validation.

AMP checker
Check whether a page links to an AMP version or is an AMP page.
Anchor distribution checker
Review internal anchor text patterns and overused anchor phrases.
Asset compression checker
Estimate where CSS, JS, and images may be missing compression opportunities.
Broken CSS asset checker
Review stylesheet URLs and statuses to identify broken CSS assets.
Broken image checker
Review image URLs and identify likely broken or missing image assets.
Broken links checker
Check a page URL for outgoing broken links.
Broken script checker
Review script URLs and statuses to identify broken assets.
Bulk canonical checker
Review page URLs and canonical targets in bulk.
Bulk meta tags checker
Check multiple URLs at once for title and meta description coverage.
Bulk status code checker CSV export
Generate a CSV-style status check summary for a URL batch.
Cache header checker
Review cache-related headers and identify weak caching signals.
Canonical chain checker
Check whether a canonical URL redirects or resolves cleanly.
Canonical conflict checker
Spot canonical conflicts between preferred URLs, canonicals, and page intent.
Canonical tag checker
Check the canonical tag declared on a page URL.
Canonical vs redirect conflict bulk checker
Review canonical targets and redirects together in bulk.
Content decay checker
Estimate whether a page may be facing content decay.
Crawl depth checker
Estimate crawl depth from a list of URLs.
CSV bulk SEO checker
Run a compact SEO check for multiple URLs from text or CSV input.
DNS lookup
Lookup the list of DNS records of a domain.
Domain IP lookup
Get the IP address and location information of a domain.
Duplicate title & description checker
Check sitemap URLs for duplicate page titles and meta descriptions.
Entity gap checker
Compare expected entities against entities already covered in your content.
Favicon checker
Detect favicon declarations and fallback favicon availability.
Heading structure checker
Analyze the H1 to H6 heading structure of a page URL.
Hreflang checker
Validate hreflang alternate language tags on a page URL.
HSTS header checker
Review Strict-Transport-Security header presence and configuration.
HTML lang checker
Inspect the HTML lang attribute of a page URL.
HTTP header diff checker
Compare two header sets and highlight key changes.
HTTP headers checker
Analyze the HTTP headers information of an URL.
HTTP status bulk checker
Check a list of URLs and return a quick status-code summary for each.
Image alt text checker
Find images missing alt text on a page URL.
Image compression opportunity checker
Estimate whether an image likely needs compression based on file size.
Image hotlink checker
Check whether images are loaded from third-party domains instead of your own.
Indexability checker
Check whether a page appears indexable based on SEO signals.
Indexation risk checker
Summarize signals that may put a page at risk of indexing issues.
IP lookup
Get the location information for an IP address.
JSON validator
Validate a JSON string and turn it into a readable format.
Keyword cannibalization checker
Compare overlapping pages and keywords to spot cannibalization risks.
Keyword difficulty checker
Estimate how difficult a keyword may be based on competition and site strength.
Keyword gap checker
Compare your covered keywords against a target list to find missing opportunities.
Keyword in page checker
Check whether a keyword appears in key SEO elements on a page URL.
Lazy load checker
Review image or iframe markup for common lazy-loading signals.
Links checker
Summarize internal and external links on a page URL.
Meta refresh checker
Detect meta refresh redirects and delays on a page URL.
Meta tags checker
Analyze the meta tags information of an URL.
Mixed content checker
Find insecure HTTP assets loaded on an HTTPS page.
Mobile viewport checker
Review a viewport meta tag for mobile-friendly rendering.
NAP consistency checker
Compare one primary NAP against citation entries for consistency issues.
Noindex page finder
Scan sitemap URLs and list pages with noindex directives.
OG image checker
Inspect the Open Graph image URL and related properties on a page URL.
Open Graph checker
Inspect Open Graph and Twitter card tags on a page URL.
Page size checker
Measure the HTML response size of a page URL.
PageSpeed checker
Fetch Google PageSpeed Insights performance metrics for a page URL.
Pagination tags checker
Inspect prev, next, and canonical pagination signals on a page.
Passive voice checker
Estimate passive voice usage and flag less direct sentences.
Readability checker
Estimate content readability from sentence length and word count patterns.
Redirect chain bulk checker
Review a batch of redirects and highlight chains, hops, and cleanup opportunities.
Redirect checker
Analyze the complete redirect path of an URL.
Regex tester
Test a regular expression pattern against sample text and review matches.
Render blocking resource checker
Detect head scripts and stylesheets that may block initial rendering.
Reverse IP lookup
Get the hostname corresponding to an IP address.
Robots meta checker
Inspect robots meta tags and X-Robots-Tag response headers.
Robots vs noindex conflict checker
Compare robots directives and noindex signals to highlight indexing conflicts.
Robots.txt checker
Inspect the robots.txt rules and sitemap declarations of a domain.
Robots.txt live tester
Test whether a path would likely be allowed or blocked by robots rules.
Schema validator lite
Validate basic JSON-LD structure and schema essentials.
Search snippet CTR tester
Review how a title and description may perform as a search snippet.
Search volume checker
Generate a directional search volume estimate for keyword planning.
Security headers checker
Check response headers for common web security protections.
Sitemap lastmod checker
Review lastmod values for URLs discovered in a sitemap.
SSL checker
Check the SSL status and information of a domain.
Status code checker
Check HTTP status codes for many URLs at once.
Structured data checker
Detect JSON-LD and Microdata structured data on a page URL.
Text diff checker
Compare two text blocks and summarize line-level differences.
Thin content checker
Estimate whether a page may have thin content based on text volume.
Third-party script impact checker
Review third-party scripts and summarize likely performance impact.
Title & meta description checker
Review page title and meta description length and presence.
Topic coverage checker
Review whether a topic draft covers the main angles users expect.
Website status checker
Check the status and availability of a website.
WHOIS lookup
Lookup ownership information of a domain.
XML sitemap checker
Validate and preview the primary XML sitemap of a domain.
Category
Free SEO Analyzer Tools
Audit, content, link, keyword, and performance analyzers for deeper SEO decisions.
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Free SEO Checker Tools
Fast validation tools for metadata, URLs, headers, redirects, crawlability, and site health.
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Free SEO Generator Tools
Helpful builders and generators for metadata, schema, content, local SEO, and bulk workflows.
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Free Converter Tools
Fast conversion tools for text, code, CSV, JSON, URLs, images, Markdown, and HTML workflows.
Category
Free AI-Style SEO Tools
Smart no-API tools that explain findings, improve copy, and support SEO decisions with rules and heuristics.
Free Category Tools

Free SEO Checker Tools

This category groups together closely related free tools so you can move through a complete workflow faster. Use these utilities to audit, validate, and improve the signals that matter most in this area of SEO and website optimization.

Each page in this section is built to solve a specific problem, and together they make it easier to diagnose issues, confirm fixes, and keep your site aligned with search engine best practices.