Free Online SEO Tools

Robots.txt Tester Robots Meta Tag Checker Canonical Tag Checker Hreflang Tag Checker

↗5 tools

Crawl & Indexing Tools

Review crawl instructions, indexing directives, canonical signals, language targeting, and sitemaps.

Keyword Density Checker Readability Checker Heading Structure Checker SEO Content Length Checker

K5 tools

Content SEO Tools

Evaluate keyword use, readability, heading structure, content depth, and text similarity.

Internal Link Analyzer External Link Analyzer Anchor Text Analyzer Image Alt Text Checker

A5 tools

Links & Media SEO Tools

Audit internal links, external links, anchor text, image alternatives, and URL slugs.

JSON-LD Structured Data Validator Schema Markup Generator SEO Redirect Rule Generator HTTP Header SEO Analyzer

{}5 tools

Technical & Structured SEO Tools

Validate structured data, generate schema, inspect headers, build redirects, and run a complete on-page audit.

All SEO Tools

25 professional working tools

Analyze supplied source, review measurable findings, and export detailed reports without a paid API.

SEO Meta Tag Checker

Extract and audit essential metadata from pasted HTML or review manually entered tags.

Title Tag Checker

Measure title length, pixel width, wording, uniqueness, and focus-keyword alignment.

Meta Description Checker

Review description length, pixel width, keyword use, calls to action, and duplicate wording.

SERP Snippet Preview

Preview a desktop or mobile-style search result and evaluate title, description, URL, and date display.

Open Graph & Twitter Card Checker

Extract and audit Open Graph and Twitter Card tags from pasted HTML.

Robots.txt Tester

Parse robots.txt rules and test whether a specific crawler path is allowed or blocked.

Robots Meta Tag Checker

Inspect robots meta tags and X-Robots-Tag values for indexing and preview restrictions.

Canonical Tag Checker

Extract canonical links, resolve relative URLs, and detect missing, duplicate, invalid, or conflicting canonicals.

Hreflang Tag Checker

Validate hreflang language-region codes, URLs, duplicates, and x-default coverage.

XML Sitemap Validator

Parse XML sitemaps or sitemap indexes and inspect URLs, dates, duplicates, limits, and host consistency.

Keyword Density Checker

Calculate phrase frequency, keyword density, word distribution, and potentially repetitive usage.

Readability Checker

Estimate readability using sentence, word, syllable, paragraph, and long-sentence metrics.

Heading Structure Checker

Parse headings from HTML and detect missing H1s, skipped levels, duplicates, and hierarchy problems.

SEO Content Length Checker

Measure words, characters, sentences, paragraphs, reading time, and content-section balance.

Duplicate Content Comparator

Compare two text blocks using normalized shingles, sentence overlap, and unique-content ratios.

Internal Link Analyzer

Extract same-site links from HTML and review destinations, anchors, attributes, and duplicates.

External Link Analyzer

Extract off-site links and review protocols, anchors, rel attributes, target behavior, and domain distribution.

Anchor Text Analyzer

Audit anchor-text diversity, generic labels, naked URLs, duplicates, and destination patterns.

Image Alt Text Checker

Extract images and audit missing, empty, repetitive, filename-like, and overly long alt text.

SEO URL Slug Analyzer

Review URL length, path depth, separators, parameters, encoding, stop words, and keyword alignment.

JSON-LD Structured Data Validator

Parse JSON-LD blocks, validate syntax and essential Schema.org properties, and expose nested entities.

Schema Markup Generator

Generate clean JSON-LD for common schema types with live field validation and copy/download output.

SEO Redirect Rule Generator

Create redirect rules for Apache, Nginx, Netlify, or Cloudflare with safety checks.

HTTP Header SEO Analyzer

Parse pasted response headers and inspect status, redirects, indexing directives, canonical links, content type, and caching.

On-Page SEO Auditor

Run a comprehensive browser-side audit of pasted HTML, page URL, and focus keyword.