Free SEO tools that run in your browser
10 working tools and 2 written methods for keyword research, content planning and technical checks, plus 2 hosted checks that run against a domain you own. No signup, no email gate, no quota, and nothing you paste leaves your machine. Written for people running SEO across more than one site.
Hosted checks
The two that need a server, because they fetch the domain you give them rather than the text you paste. Still free, still no account.
AI-readiness check
Nine pass or fail checks on any domain: whether robots.txt is reachable, whether GPTBot, ClaudeBot, PerplexityBot and five other AI crawlers are allowed, whether a sitemap is declared, whether the homepage carries JSON-LD and Organization schema, whether there is an llms.txt or a markdown copy, whether the title and meta description are present, whether there is exactly one h1, and whether robots.txt states a Content-Signal preference.
Reads the homepage, robots.txt, sitemap.xml and llms.txt. Results in seconds, with a link you can share.
Growth plan
Three checkable blocks about a domain you own: what it already ranks for, the keywords within reach, and what is missing on the page. Uses live SERP data, and says so.
Shows the result before it asks anything. No account.
Keyword tools
From a raw list to a plan: cluster, compare, check.
Free Keyword Clustering Tool: Group Keywords by Topic
Paste a keyword list and get topic groups with a page type for each. Free, in your browser, plus the method for confirming groups against the SERP.
Interactive tool, runs in your browser
Free Keyword Density Checker: A Diagnostic, Not a Target
See which words and phrases a page repeats, with counts. Plus why an ideal density figure does not exist.
Interactive tool, runs in your browser
Free Keyword Gap Analysis Tool: Compare Two Keyword Lists
Paste your ranking keywords and a competitor's, get the gaps, the overlap and what is yours alone, with branded noise filtered out. Free, in your browser.
Interactive tool, runs in your browser
Content tools
Briefs, snippets and drafts, measured before they publish.
Free Meta Description Generator With SERP Preview
Meta descriptions that survive Google's rewriting: the length that displays, and five patterns that work.
Interactive tool, runs in your browser
Free SEO Content Brief Template and Generator
Fill in eleven fields and copy a Markdown content brief a writer will follow. Free, in your browser, with the reasoning behind each field.
Interactive tool, runs in your browser
Free Word Counter and Readability Checker
Words, sentences, reading time and a Flesch grade. Plus why word count is a symptom, not a target.
Interactive tool, runs in your browser
Technical SEO tools
The files and markup a crawler reads before it reads your copy.
Free FAQ Schema Generator (JSON-LD, Article, Breadcrumb)
Generate valid Article, FAQPage and BreadcrumbList JSON-LD, and the one rule that keeps it from backfiring.
Interactive tool, runs in your browser
Free Internal Link Checker: Audit Anchors on Any Page
Paste a page's HTML and get every internal link with its anchor text, flagged for generic anchors, repeated targets, image links with no alt and links to itself.
Interactive tool, runs in your browser
Free robots.txt Generator With AI Crawler Rules
Build a robots.txt with AI crawler rules. Which bots train models, which answer questions, and why it matters.
Interactive tool, runs in your browser
Free Slug Generator: Clean URL Slugs From Any Title
Clean URL slugs in bulk, with proper accent transliteration. Plus why renaming a ranking URL is the wrong call.
Interactive tool, runs in your browser
SEO Health Check: The Agency Audit Checklist
A repeatable SEO health check: crawl, indexation, structure and AI-readiness, in problem-finding order.
Written method with a copyable template
Analysis guides
How to read what the SERP is already telling you.
Why nothing here asks for an email
A free tool that gates its result behind a form is a lead form with a longer introduction. Every interactive tool on this page does its work in your browser, so there is no server cost to recover and no reason to ask who you are. The one that does real fetching, the growth plan, still shows its result before asking anything.
The trade is straightforward. These solve the small, repeated problems. AltoRank is for when you want the whole loop run every week, across every site you look after, with a person approving each article before it publishes. The engine is open source if you would rather run it than buy it.
Common questions
Are these SEO tools really free?
Yes. No signup, no email gate, no daily quota and no watermark on the output. Every interactive widget on this page runs in your browser; the text you paste is never sent to a server, ours or anyone else's. The two hosted checks, the AI-readiness check and the growth plan, do fetch the domain you give them, and are free on the same terms.
Why does a paid product give these away?
Because they are the small, repeatable checks, and the product is the recurring work around them: researching, drafting, checking and publishing articles for many sites at once, with a person approving each one. If a free tool solves your problem, take it. If you want the work done every week, that is AltoRank.
Can I use them for client work?
Yes, without attribution and without limit. Agencies run them on prospects as often as on clients.
Do the tools use live search data?
No. Anything that needs live rankings or search volume is deliberately not on this page, because a tool that quietly calls an API is not free for long. The one exception is the growth plan, which does fetch live SERP data for a domain and says so.
Which of these are guides rather than tools?
2 of the 12 pages are written methods with a copyable template rather than an interactive widget. Each is labelled on this page, so you know before you click.