Free SEO Tools

Striking Distance Keyword Finder

Reads a Search Console Queries export and lists the keywords ranking just below the top, ranked by the clicks a better position would add.

Keyword Cannibalization Checker

Finds pages competing for the same search, from a list of pages and target keywords or from a Search Console export.

Canonical Tag Generator

Turns messy page URLs into clean canonical link tags and HTTP headers, stripping tracking parameters, fragments, index files and http.

Breadcrumb Schema Generator

Builds BreadcrumbList JSON-LD from a page URL’s own path and checks it against what Google needs for the breadcrumb rich result.

Sitemap Validator

Checks a pasted or fetched sitemap.xml against the sitemap protocol — namespace, escaping, lastmod format, duplicates, off-host URLs and size limits.

Favicon Generator

Upload one image, get every favicon size a site needs — browser tab, iOS, Android, PWA — plus the HTML to add them. Runs in your browser.

Meta Robots & X-Robots-Tag Checker

Reads a page’s meta robots tag and X-Robots-Tag HTTP header together — either source alone can noindex a page, so checking only one misses half the picture.

Robots.txt Tester

Fetches a domain’s robots.txt and tests whether any path is allowed or blocked for Googlebot, Bingbot, GPTBot or any custom crawler.

WWW/HTTPS Canonicalization Checker

Checks whether http, https, www and non-www all redirect to one canonical URL — the duplicate-content problem most sites never notice.

Hreflang Tag Generator

Builds valid hreflang link tags for every language and region variant of a page, including x-default, with each code checked as you type.

Anchor Text Checker

Lists every link on a page with its anchor text and rel attributes, and flags generic, empty and ambiguous anchors.

Text to HTML Ratio Checker

Measures how much of a page’s bytes are visible text versus markup, scripts and styles, with an honest note on what the ratio means.

Heading Structure Checker

Checks a page’s H1-H6 hierarchy — missing or multiple H1s, skipped levels, duplicate headings — with the full outline shown.

Table of Contents Generator

Builds a nested, anchor-linked table of contents from pasted HTML or Markdown headings — HTML or Markdown output.

Base64 Encode/Decode

Encodes or decodes Base64 text instantly in your browser — handles UTF-8 and URL-safe Base64 correctly.

JSON Formatter & Validator

Formats, minifies and validates JSON instantly in your browser, with the exact line a syntax error is on.

Markdown to HTML Converter

Converts Markdown to HTML instantly in your browser — headings, lists, links, code blocks and GitHub-flavored tables all supported.

Find and Replace Text

Finds and replaces text instantly in your browser, with whole-word matching and regular expression support.

Page Weight Checker

Total page weight, broken down by images, scripts, styles and fonts, with the heaviest resources named — checked live.

Remove Line Breaks

Cleans up text pasted from a PDF or Word doc — keeps real paragraph breaks, joins the hard-wrapped lines inside each one.

Text Case Converter

Converts text to UPPERCASE, Title Case, camelCase, snake_case, kebab-case and more, instantly in your browser.

Duplicate Line Remover

Removes duplicate lines from a pasted list — case-insensitive by default, with options for exact matching, empty lines and sorting.

Duplicate Content Checker

Compares two pages (or two texts) for content similarity — catches near-duplicates before Google has to pick which one to rank.

UTM Campaign URL Builder

Builds a campaign tracking link and flags the spacing and casing mistakes that silently split one campaign into two rows in analytics.

Meta Tags Generator

Generates a page’s title, description, canonical, Open Graph and Twitter Card tags from one form, with pixel-accurate length checks.

Open Graph & Twitter Card Checker

Checks a page’s Open Graph and Twitter Card tags and previews exactly how it will look shared on social — missing image, bad title, wrong domain.

Canonical Tag Checker

Checks a page’s canonical tag for missing, duplicated, relative, or cross-domain issues — and confirms the declared target actually answers.

Broken Image Checker

Checks every image on a page live — dead src links, missing alt text, oversized files — up to 50 images, no sign-up.

XML Sitemap Generator

Crawls a site’s own internal links to build a valid sitemap.xml — real lastmod dates, no invented priority or changefreq, up to 200 pages.

DNS Checker

A, AAAA, MX, TXT, NS, CNAME and SOA records from Google and Cloudflare’s resolvers side by side, plus SPF and DMARC — with reverse DNS for an IP.

Security Headers Checker

Grades a page’s HSTS, CSP, X-Frame-Options, Referrer-Policy and cookie flags, with what each one protects against and the header to add.

SEO Optimization Checker

One pass over a page’s on-page SEO — indexing, title, description, headings, content, links, mobile and structured data — with a fix and a deeper tool for every issue.

SEO Title Checker

Measures a title the way Google does — in pixels — shows where it gets cut off, checks keyword and brand placement, and compares versions side by side.

Favicon Checker

Every icon a site declares — tab, iOS home screen, manifest, /favicon.ico — with its real pixel size and whether it actually loads, shown where people see it.

hreflang Checker

Validates a page’s hreflang set against ICU language and country data, then fetches every alternate to see which ones fail to link back.

Reading Time Calculator

How long a text takes to read, say aloud and listen to — at measured rates, with word, sentence and paragraph counts. Paste it or fetch a URL.

URL Slug Generator

Turns a title into a clean URL slug — transliterates Turkish, Russian and Greek instead of deleting them — and flags what will age or break the URL.

OG Image Generator

A 1200×630 Open Graph card from a title, a line and your logo — three templates, your colour, PNG download, and the meta tags to paste.

Internal Link Checker

Every internal link on a page with its anchor text, placement, rel and HTTP status — broken, redirected, nofollow and generic anchors flagged.

llms.txt Generator

Turns a site’s sitemap into an llms.txt — name, summary and a curated link list with descriptions — ready to edit, lint and upload.

FAQ Schema Generator

FAQPage JSON-LD from your questions and answers — or imported from a page that already has them — validated against what Google and Bing document.

robots.txt Generator

Builds a correct robots.txt from a form — disallow paths, sitemap line, and named rules for AI crawlers — then lints it and tests any URL against it.

Domain Rating Checker

The Ahrefs DR of any domain, live from Ahrefs’ API — compare three domains side by side and download a shareable card with the site’s favicon.

AI Visibility Checker

Can ChatGPT, Claude, Perplexity, Gemini and Copilot crawl, read and cite your site? Checks 20+ AI crawlers, llms.txt, structured data, Wikipedia citations and entity signals.

Redirect Checker

Follows every hop as Googlebot — 301, 302, meta refresh, JavaScript — checks each URL against robots.txt, and reads whether the page at the end can be indexed.

Startup Directory List

160+ startup and AI tool directories ranked by DR we measured ourselves — free/paid terms, dofollow status, badge requirements, direct submit links.

Schema Markup Validator

Checks JSON-LD against what Google requires for a rich result — not just whether it parses — and names the property standing in the way.

Schema Markup Generator

Build valid JSON-LD for Article, FAQ, How-to, Product, Local Business, Breadcrumbs, Organization and Video — with the fields Google actually requires marked.

robots.txt & Sitemap Checker

Tests robots.txt, validates sitemap.xml, and finds the pages your own robots.txt blocks — the conflict neither file shows on its own.

AI Tweet Rewriter

Rewrites a draft tweet through a fixed playbook: numbered hooks, basic English, reply magnets.

AI Crawler Access Checker

Shows which AI crawlers your robots.txt lets in — GPTBot, ClaudeBot, PerplexityBot, Google-Extended — and what blocking each one costs you.

Meta Tag Checker & SERP Preview

Reads a page’s title, description, canonical and OG tags, shows how they render in Google and on social, and flags what is missing or too long.

Keyword Density & Readability

Counts term frequency and scores readability, so you can see stuffing and heavy sentences before you publish.

Broken Link Checker

Crawls a page and reports every link that 404s or redirects, with the status code for each.

Spam Risk Checker

Scores a page against the patterns Google’s spam policies describe, and names what triggered each one.