All Tools

84 free SEO tools, grouped by what they actually do — no signup, no paywall.

Full-Site Overviews

Run every check at once and get one score to start from.

Full Site Audit

Run every on-page and technical SEO check against a URL in one pass.

Site Health Dashboard

A single score for crawlability, content, links, and security.

Accessibility Quick Check

Scan a page for missing alt text, empty links, skipped heading levels, and other common accessibility issues.

Mobile-Friendliness Checker

Check a page's viewport tag, tap-target hints, and other static signals of mobile readiness.

Duplicate Content Checker

Compare two URLs and see how much of their visible text actually overlaps.

Core Web Vitals Checker

Run a real Lighthouse check and see actual LCP, CLS, and INP — lab data plus real-world Chrome UX Report field data, when available.

On-Page SEO

Title tags, headings, images, and content — what search engines read first.

Meta Tag Analyzer

Check title, description, canonical, Open Graph, and Twitter Card tags.

Heading Structure Checker

Validate H1-H6 hierarchy and catch heading-order mistakes.

Image Alt Checker

Find images missing alt text across a page.

Keyword Density

Analyze keyword usage and distribution across a page's content.

SERP Snippet Preview

See exactly how a title and meta description will look in Google results before you publish.

Favicon Checker & Downloader

See every icon a page declares — favicon, Apple touch icon, manifest icons — and download any of them.

Meta Tag Generator

Generate title, description, Open Graph, and Twitter Card tags from a form, with a live search preview.

Keyword Suggestion Tool

Get the real phrases people type into Google for any seed keyword, pulled from autocomplete.

Readability & Content Analyzer

Word count, reading level, sentence length, and text-to-HTML ratio for any page.

Anchor Text Analyzer

Extract every link's anchor text on a page and flag generic, non-descriptive links like "click here".

Technical SEO

Redirects, sitemaps, and crawl rules — the plumbing search engines depend on.

Redirect Chain Checker

Trace a URL's full redirect path, hop by hop, and catch loops before Google does.

Sitemap Validator

Check an XML sitemap for structure errors, bad URLs, and protocol limits.

Robots.txt Generator

Build a robots.txt from crawl rules, without writing the syntax by hand.

Robots.txt Checker

Fetch a site's live robots.txt and flag rules that block crawlers or leave out the sitemap.

Page Speed & Size Check

Measure a page's server response time, HTML weight, and the resource count that drives load time.

AI Crawler Access Checker

See which AI bots — GPTBot, ClaudeBot, Google-Extended, and more — your robots.txt allows or blocks.

Sitemap URL Extractor

List every URL in an XML sitemap or sitemap index, with lastmod dates, ready to copy or download.

Broken Link Checker

Scan a page's links and find the ones that return 404s, errors, or time out.

Website Technology Detector

Find out what a site is built with — CMS, framework, analytics, and hosting clues from its HTML.

Hreflang Tag Generator

Build correct hreflang link tags for every language and region version of a page.

llms.txt Generator

Create an llms.txt file that tells AI assistants what your site is and which pages matter.

Canonical URL Analyzer

Check whether a page's canonical tag correctly points at itself — protocol, www, and trailing-slash mismatches included.

Mixed Content Checker

Scan an HTTPS page for insecure http:// resources — images, scripts, and stylesheets browsers can silently block.

Hreflang Validator

Check an existing page's hreflang tags for missing self-references, missing x-default, and duplicate language codes.

Broken Image Checker

Scan a page's images and find the ones that fail to load — 404s, timeouts, and broken sources.

Text-to-HTML Ratio Checker

See what share of a page's HTML is actually visible text, versus markup, scripts, and styles.

Custom 404 Page Checker

Request a page that doesn't exist and check whether the site returns a real 404 or a silent soft-404.

Domain & Network

DNS, certificates, headers, and registration — what's true about a domain before any page loads.

HTTP Header Checker

Inspect a URL's response headers and grade its security headers — HSTS, CSP, X-Frame-Options, and more.

DNS Lookup

Look up a domain's A, AAAA, CNAME, MX, NS, and TXT records in one query.

SSL Certificate Checker

Check a site's TLS certificate — issuer, expiry date, covered domains, and days left before it lapses.

Domain Age Checker

Find out when a domain was first registered, when it expires, and who the registrar is.

IP & Hosting Lookup

Resolve a domain to its IP address and see who hosts it — provider, ASN, and approximate location.

Blacklist / Spam Checker

Check a domain's IP against public DNS blacklists used for spam and reputation filtering.

Email Deliverability Checker

Check a domain's SPF, DKIM, and DMARC setup and see exactly what's missing or misconfigured.

Structured Data

Generate the JSON-LD markup search engines use for rich results.

FAQ Schema Generator

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

Schema Markup Validator

Find every JSON-LD block on a page and check it parses, has a @type, and is ready for rich results.

Schema Markup Generator

Build JSON-LD for Article, Product, LocalBusiness, Organization, Event, Video, HowTo, and Breadcrumb.

Review Schema Generator

Build standalone Review and AggregateRating JSON-LD for review or comparison pages — not tied to a single Product.

Recipe Schema Generator

Build Recipe JSON-LD with ingredients, steps, times, and nutrition — the markup behind Google's recipe rich results.

JobPosting Schema Generator

Build JobPosting JSON-LD for a careers page — the markup Google for Jobs requires for a listing to appear.

SoftwareApplication Schema Generator

Build SoftwareApplication JSON-LD for an app landing page — rating, price, OS, and category for Google's app rich results.

Course Schema Generator

Build Course JSON-LD for an online course page — provider, instructor, and rating for Google's course rich results.

Social Sharing

How your links actually look when they're shared.

Twitter/X Card Validator

Preview and validate how a URL renders as a card when shared on X.

Open Graph Checker

Preview how a URL looks when shared on Facebook, LinkedIn, or WhatsApp, and catch missing og: tags.

Social Share Link Generator

Build ready-to-post share links for X, Facebook, LinkedIn, WhatsApp, Reddit, and email from one URL.

Social Media Image Resizer

Crop and export an image to the exact dimensions each platform needs — Facebook, Instagram, X, LinkedIn, YouTube.

Social Post Character Counter

Type a caption once and see its live character count against X, LinkedIn, Instagram, Facebook, and Threads limits.

Developer Utilities

General-purpose tools that don't need a URL at all.

YouTube Tools

For creators — no API key, no login.