Free SEO tools
Free, no signup. Tools I built to help you. Most run entirely in your browser — no signup, nothing stored.
Tool Finder
Start with the job
Search the full collection or choose a common SEO task.
Guided workflows
Finish a job, not just a check
Choose a browser-local recipe. Each step opens separately and runs only when you start it.
Diagnose an indexing problem
Check the page-level signals first, then its canonical signals, then crawler access.
Publish a page with clean SEO signals
Review the page, validate its structured data, then confirm which rich-result requirements are actually met.
Investigate traffic or indexing loss
Rule out observable indexing and canonical problems before checking whether performance is part of the change.
Plan and verify a migration
Use the dedicated command center to build the map, verify deployment, reconcile sitemaps, and preserve a browser-local report.
More guided workflows
Audit a migration
Trace a representative redirect, map any chain, then validate the migration sitemap.
Investigate an unfamiliar domain
Compare public DNS, delivery-network evidence, and registry records without treating any one source as proof of ownership.
Validate structured data
Separate syntax and entity issues from the requirements that limit rich-result eligibility.
Audit AI crawler access
Review the site-level AI crawler policy, then verify the underlying robots rules against the same public target.
Investigate rendering differences
Compare raw and rendered output, then check whether the mobile presentation creates a separate observable problem.
Improve AI search readiness
Check crawler access, compare rendered content, then assemble the broader readiness report.
Turn paid-search evidence into organic work
Join channel exports, isolate landing-page mismatches, and prioritize spend that organic improvements may replace.
Run pre-release SEO QA
Compare staging with production, then verify the production target against performance evidence.
Recommended starting points
Useful right now
SEO Opportunity Finder
Choose an evidence-backed content, link, or technical SEO workflow, then open the free tool that can evaluate it without turning every warning…
Google Index Checker
Check one URL’s observable indexability blockers, or reconcile sitemap, crawl, and supplied Search Console evidence across a URL set before…
robots.txt Tester
Test pages against bots with a matcher ported from Google's open-source robots.txt parser — a blocked/allowed matrix with the exact winning rule…
HTTP Status & Redirect Checker
Paste up to 500 URLs — status codes, full redirect chains, final destinations, per-hop and total latency, response-header evidence, canonical…
Schema Markup Validator
Paste JSON-LD or a full HTML page and get severity-tiered structured-data validation — schema.org vocabulary, Google rich-result requirements…
SERP Snippet & Truncation Checker
Measure title-tag and meta-description widths with consistent font stand-ins and compare them with configurable desktop and mobile preview…
Full collection
All free SEO tools
100 tools
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Crawling & indexing
Scout Site Audit Free
Run a bounded same-site raw-HTML crawl, group technical SEO findings by detector, and export an honest coverage report.
Google Index Checker
Check one URL’s observable indexability blockers, or reconcile sitemap, crawl, and supplied Search Console evidence across a URL set before…
Canonicalization Checker
Audit HTML and HTTP canonical signals, test the canonical target, and identify observable conflicts that can cause Google to choose a different…
robots.txt Tester
Test pages against bots with a matcher ported from Google's open-source robots.txt parser — a blocked/allowed matrix with the exact winning rule…
XML Sitemap Validator
Paste, upload, or fetch a sitemap by URL — errors, warnings, and a health score with line numbers. Pasted and uploaded sitemaps are validated…
Log File Analyzer
Drop a server access log and see crawl budget by bot and section, status-code waste, an AI-vs-search breakdown, and a spoofer report that names…
Faceted Navigation Auditor
Classify supplied parameter URLs, surface crawl traps, and advise on facet controls.
Googlebot Verifier
Check whether an IP claiming to be Googlebot, Bingbot, GPTBot, ClaudeBot, or another crawler is genuine — published IP ranges plus…
SEO Incident Simulator
Practice thirty deterministic technical SEO incident investigations — indexability, crawl controls, redirects, sitemaps, markup, caching, DNS…
IndexNow Submitter
Validate and explicitly submit a same-host URL list to IndexNow; Google does not use IndexNow.
robots.txt Generator
Build a copy-ready robots.txt with grouped search, AI-training, assistant, and archive-crawler presets; optionally add a documented Bingbot…
XML Sitemap Generator
Generate an XML sitemap from a capped, robots-respecting same-site crawl. Noindex, off-canonical, failed, and uncertain URLs remain visibly…
Wayback Change History
Load cached archive snapshots and compare text changes over time.
Historical Page Comparison
Compare one bounded Common Crawl capture with the current page’s metadata, canonicals, robots directives, structured-data types, word count, and…
Domain & site health
Domain Report
Run one bounded report for public DNS, registry RDAP data, hosting evidence, reachability, and website safety signals, with each section linked…
Website Down Checker
Check whether one URL or a small sample is reachable right now from one Cloudflare location, with response timing, redirects, DNS fallback…
Website Safety & Security Checker
Get an honest, graded security snapshot: response headers, insecure resource and form signals, security.txt, registry age, fetch/TLS outcome, and…
HTTP Status & Redirect Checker
Paste up to 500 URLs — status codes, full redirect chains, final destinations, per-hop and total latency, response-header evidence, canonical…
HTTP Header Checker
Inspect complete response headers across every redirect hop, with separate security and SEO grades, CDN/edge fingerprints, compression details…
DNS Checker
Compare A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV, and PTR answers from Cloudflare and Google to spot DNS propagation differences.
Staging vs. Production SEO Diff
Compare matched release URLs across redirects, canonicals, robots directives, hreflang, selected headers, schema eligibility, and raw or…
Hosting Checker
Find a domain's public IP network, CDN or edge platform, DNS and mail-host evidence, and response transfer facts without pretending a proxy…
Whois / RDAP Lookup
Look up registrar, registration and expiry dates, nameservers, EPP domain-lock statuses, and privacy-redacted registrant information via RDAP.
CMS & Tech Detector
Inspect a public page's visible HTML and selected response headers for CMS, framework, CDN, and analytics fingerprints.
Page and Website Authority Checker
Compare page- and domain-level Moz, Ahrefs, OpenPageRank, and Common Crawl authority metrics without blending provider scores.
Pre-publish Comparison
Compare draft and live HTML locally across normalized head signals, heading outlines, and structured data with honest not-evaluated states.
Redirects & migrations
SEO Migration Planner & Validator
Run a five-step SEO migration workflow: build and review a redirect map, verify deployed redirects, check old-URL status, compare sitemaps, and…
Redirect Checker
Check where a URL redirects — final status code, every hop in the chain, and the destination — for one URL or a quick batch. A fast, no-frills…
Redirect Chain Mapper
Trace every hop of a redirect chain — status codes, what changed at each step (HTTPS, www, slash, domain, path), a severity verdict, meta-refresh…
Redirect Map Builder
Plan a site migration: paste old and new URLs and get a suggested 301 map — each row scored into a confidence tier with a plain reason, an…
JavaScript & rendering
Structured data & entities
Schema Markup Validator
Paste JSON-LD or a full HTML page and get severity-tiered structured-data validation — schema.org vocabulary, Google rich-result requirements…
Rich-Result Eligibility Checker
Paste JSON-LD, an HTML page, or fetch a live URL and compare detected types with the Google rich-result requirements this tool tracks — ✓…
Schema Markup Generator
Free JSON-LD generator with 19 focused forms plus all 921 vendored Schema.org types. Browse inherited properties and expected ranges, use honest…
Entity Coverage Analyzer
Extract likely page entities, reconcile selected matches, and draft transparent about/mentions JSON-LD.
Google Knowledge Graph Explorer
See whether Google's Knowledge Graph knows a person, company, or brand — the entity's name, types, description, and machine ID — with a…
Semantic Site Map
Explore this site's build-time semantic center, topic coherence, article outliers, and nearest editorial neighbors.
On-page & content
On-Page SEO Checker
A prioritized top-five on-page memo plus advanced raw-HTML checks for headings, links, images, favicons, and social metadata.
SEO Opportunity Finder
Choose an evidence-backed content, link, or technical SEO workflow, then open the free tool that can evaluate it without turning every warning…
Heading Structure Checker
Paste HTML or fetch a public page to visualize its heading hierarchy, catch skipped levels and empty headings, compare its H1 with the title, and…
Link Analyzer
Inspect a page’s links and linked resources with source locations, calibrated anchor-text findings, and optional batched HTTP status checks.
Image SEO Checker
Audit raw HTML image signals: alt attributes, lazy-loading hints, fetch priority, source formats, and ImageObject markup.
Commodity Content / Information Gain Checker
Compare one page with 3–5 competitors to inspect deterministic overlap, unique statements, and an artifact-bound Experience proxy.
AI Content Brief Generator
Assemble an exportable brief while preserving which research inputs are observed, heuristic, or not evaluated.
Content Gap Analyzer
Cluster competitor keyword wins into page-level content opportunities.
Internal Link Cluster Visualizer
Analyze a bounded supplied internal-link graph, orphans, PageRank, and lexical missing-link suggestions.
Content Completeness Audit
Audit 14 useful content formats with deterministic presence checks and optional, explicitly enabled editorial AI gating.
SERP & snippets
SERP Snippet & Truncation Checker
Measure title-tag and meta-description widths with consistent font stand-ins and compare them with configurable desktop and mobile preview…
Google SERP Simulator
Interactive Google result preview: type a title, description, and URL, compare controlled-font desktop + mobile truncation guidance with…
Open Graph & Social Preview
Fetch a page as a real crawler or browser user-agent, preview its Open Graph and X cards across nine surfaces, verify the image, and edit…
Favicon Checker
Inspect favicon, Apple touch icon, mask icon, manifest, and Microsoft tile declarations, with coverage gaps and surface previews.
Meta Title Generator
Generate five SEO title-tag options with AI, then compare their measured widths with approximate desktop and mobile SERP-preview guidance. Each…
Meta Description Generator
Generate five meta-description options with AI, then compare their measured widths with approximate desktop and mobile SERP-preview guidance.…
Keywords & search demand
Keyword Idea Generator
Build transparent question, comparison, and modifier planning ideas with local clustering and no invented volumes.
Google Search Console Hidden Query Estimator
Upload a Search Console performance export plus an Ahrefs or Semrush keyword export, and see which queries plausibly explain the clicks and…
Which Pages Should I Work On?
Rank GSC pages by striking-distance, CTR-gap, and decay opportunity.
Google Search Console CSV Analyzer
Explore page-query pivots, template-like URL segments, topics, custom CTR curves, cannibalization, and opportunities from uploads or an optional…
GSC Regex Builder & Tester
Lint RE2 regex syntax and test Search Console filters against your own query list in the browser.
Brand/Non-Brand Splitter
Split GSC or Ads query rows into typo-tolerant brand and non-brand CSVs locally in your browser.
Brand Suggest Auditor
Review reputation and comparison query framings around a brand without overstating them as live suggestions.
AI Search Volume Estimator
Turn traditional Google keyword volume into an estimated AI search volume — per system (ChatGPT, Gemini, Perplexity, Copilot) and overall — with…
Vertical SEO
Local SEO Checker
Audit raw LocalBusiness schema and visible NAP/service-area signals.
PDP SEO Checker
Audit raw product schema, price, availability, and visible-price consistency.
News SEO Checker
Audit raw NewsArticle schema, publication-date, and author signals.
Video SEO Checker
Audit VideoObject, thumbnail, key-moment, and embed signals in raw HTML.
AI Commerce Validator
Validate public agentic-commerce discovery and XML/TSV merchant-feed readiness against a dated local baseline.
Local SERP Generator
Build a Google search link for a manual city or coordinate, country, language, and device context — without scraping results.
AI search visibility
AI Search Readiness Report
See independently whether AI crawlers can retrieve your page, and which future use, citation, and representation checks are still unavailable …
AI Brand Visibility Checker
Sample a labelled model response about a brand, distinguish mentions from citations, and save local snapshots for comparison.
AI Citation Readiness Checker
Separate citability from retrieval evidence, with transparent named weights and a per-model freshness-adjusted view.
Citation Gap Checker
Spot unsupported numerical and research-style claims, aging statistics, and citations that need human verification.
Quotable Sentence Finder
Find the self-contained, specific sentences an AI answer engine can quote, and inspect six familiar readability formulas. Paste mode stays in…
Chunk Tester
Paste content or a URL and see how a retrieval system would split it into the chunks AI answer engines actually retrieve and cite — colored chunk…
AI Answer Preview
Simulate a context-only answer from your page and flag answer sentences that do not match a source passage.
Query Fan-Out Simulator
Generate labelled sub-query approximations around a question and check page coverage without claiming to observe a private search system.
Quotability & Entity-Preserving Rewriter
Rewrite one paragraph for citability or preserve a declared entity/keyword set; not a general paraphraser.
AI Content Audit
Run one deterministic GEO/AEO audit across extractability, answer-ready structure, and citation trust, with a transparent 0–100 score and a…
AI crawlers & agents
Agent Readiness Checker
Check public MCP, agent-card, llms.txt, security, and Content-Signals discovery markers.
AI-Crawler Access Checker
Enter a URL and see, for every major AI crawler — GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and more — whether your robots.txt allows or…
llms.txt Generator + Validator
Generate a well-formed llms.txt that points LLMs at your key pages, or paste/fetch one and check it's valid — H1, summary, well-formed absolute…
SEO MCP Server
Connect an AI agent to a read-only MCP server for published SEO content, crawler-IP verification, schema validation, and bounded redirect-chain…
PPC
Google Ads Hidden Search Terms Estimator
Upload a Google Ads search-terms report plus a GSC queries export or Ahrefs/Semrush keyword export, and see which on-theme queries never show up…
Negative Keyword Generator
Review high-spend, zero-conversion off-theme terms as Ads negative candidates.
Auction Insights Trend Visualizer
Inspect competitor impression-share and overlap trends, including censored values.
PPC + SEO
Paid/Organic Overlap Quadrant
Join Ads and GSC data into paid-only, organic-only, strong-both, and weak actions.
Landing-Page Mismatch Finder
Compare paid landing pages with GSC organic results for the same terms.
Brand Bid Decider
Compare Ads and organic brand signals, with transparent test-pausing and holdout guidance.
PPC → SEO Arbitrage Prioritizer
Prioritize paid terms where organic improvements could replace spend, plus converting paid-only content briefs.
RSA ↔ Title Tag Cross-Pollinator
Compare RSA headline signals and title tags by landing page to uncover unused copy angles.
Forecasting & ROI
SEO ROI Calculator
Model the revenue impact of an SEO investment — content, links, technical, or a full program — with conservative/optimistic scenarios, a…
SEO Forecast
Upload GSC, GA4, Ahrefs, Semrush, or Adobe time series and forecast it with backtested models — Google algorithm updates handled as level shifts…
Enterprise SEO ROI Calculator
Model your SEO program as an acquisition channel: organic CAC, gross-margin LTV (optionally NPV-discounted), CAC payback, and a cohort-based…
Performance & Core Web Vitals
Page Speed Test & Core Web Vitals Checker
One sentence tells you whether a page passes Core Web Vitals and what to fix first — real Chrome user data (CrUX) with a Lighthouse lab fallback…
HAR Analyzer
Analyze a HAR locally for failures, redirects, transfer weight, timings, cache evidence, third parties, and tag requests without uploading the…
Mobile-Friendly Tester
Run a seven-part mobile-layout diagnostic — a 0–100 product score for viewport, responsive CSS, fixed widths, font sizes, images, page weight…
Core Web Vitals History & Competitor Comparison
Chart 40 weeks of real-Chrome-user Core Web Vitals — p75 LCP, INP, CLS, FCP, and TTFB from the Chrome UX Report — and compare up to 5 origins or…
Accessibility
Accessibility Tester
Run a browser-rendered axe-core WCAG 2.2 A/AA audit, grouped by severity with affected selectors and focused repair guidance. Automated checks…
Color Contrast Checker
Check WCAG 2.2 AA and AAA contrast for any foreground/background pair, find nearest passing colors, and audit CSS or design-token palettes…
International SEO
hreflang Generator + Linter
Enter your URL × locale matrix and get bidirectional hreflang markup as head tags, sitemap XML (auto-split past 50,000 URLs), and Link headers …
returntag - hreflang checker
Enter one URL or an XML sitemap and the returntag - hreflang checker crawls the whole hreflang cluster — missing return tags, broken targets…
Free, no signup. All tools here are free to use on this site. The code and the APIs behind them are © Patrick Stox LLC — endpoints are origin-locked and rate-limited, not offered as a public API. Want to license a tool or build an integration? Get in touch.