Free SEO generators and checkers
Start with the hreflang checker (validate tags or a language/URL table), then the robots.txt checker, schema markup validator, UTM generator, and AI meta description writer. Also: AI crawler blocks, a page-level meta robots tag builder, llms.txt for assistants, Open Graph tag preview from pasted HTML, a canonical URL builder that strips utm/gclid, a from→to redirect-map checker (loops, chains, duplicates), XML sitemaps plus a lastmod stamper, a favicon size checklist, FAQ / Product / LocalBusiness JSON-LD, meta titles, URL slugs, viewport meta, and alt text. Paste the snippet into your CMS — the generator never fetches your site.
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Robots and sitemaps
Robots.txt Generator
Build a robots.txt with Allow, Disallow, Sitemap, and AI crawler groups. Copy and deploy — no account.
robots.txt checker
Free robots.txt checker. Paste a robots.txt and test any path for a user-agent — longest-match Allow/Disallow in your browser.
Robots.txt Block GPTBot
Generate a robots.txt that blocks GPTBot, ChatGPT-User, Google-Extended, and other AI crawlers.
Sitemap XML Generator
Turn a list of URLs into a sitemap.xml with lastmod, changefreq, and priority. Client-side only.
llms.txt generator
Free llms.txt generator. Build an assistant-facing markdown file of the pages you want cited. Browser tool — nothing is uploaded.
sitemap lastmod
Free sitemap lastmod helper. Stamp YYYY-MM-DD on a urlset or URL list. Complements the sitemap XML generator. Browser tool — nothing is uploaded.
meta robots
Free meta robots tag builder. index/follow, noarchive, max-image-preview — complements robots.txt. Browser tool — nothing is uploaded.
redirect map
Free redirect map checker. Paste a from→to CSV — loops, chains, duplicate sources, self-maps. Does not fetch URLs. Browser tool — nothing is uploaded.
UTM tags
Meta and hreflang
Meta Title Generator
Generate title variants with character and pixel-width checks. Local templates, no API.
ai meta description
Free AI meta description generator. Draft descriptions from a topic, keyword, and page text with length and pixel checks. Local in your browser.
Alt Text Generator
Write alt text from a filename, subject, and context. Local — this is not a vision model.
hreflang checker
Free hreflang checker and validator. Check hreflang online for missing x-default, relative URLs, and duplicates. Runs in your browser.
slugify
Free slugify URL slug generator. Lowercase, strip accents, collapse punctuation — one line or a batch. Browser tool — nothing is uploaded.
viewport meta
Free viewport meta generator. Build width, scale, user-scalable, and viewport-fit — with a WCAG zoom warning. Browser tool — nothing is uploaded.
open graph
Free Open Graph tag preview. Paste HTML — parse og: and twitter: cards in this tab. Nothing is uploaded.
canonical url
Free canonical URL builder. https, lowercase host, drop utm/gclid/hash, sort query. Browser tool — nothing is uploaded.
favicon size
Free favicon size checklist. 16/32, apple-touch 180, PWA 192/512 — copy <link> tags. Browser tool — nothing is uploaded.
Schema markup
JSON-LD Schema Generator
Generate JSON-LD for FAQ, Product, or LocalBusiness and copy a script tag. Nothing is uploaded.
FAQ Schema Generator
Turn question-and-answer pairs into FAQPage JSON-LD. Add the script to any article.
Product Schema Generator
Build Product + Offer JSON-LD with price, currency, and availability.
LocalBusiness Schema Generator
Generate LocalBusiness JSON-LD with PostalAddress. Restaurant, Store, or generic.
schema markup validator
Free schema markup validator. Paste JSON-LD or a script tag and check required fields for Product, FAQ, and LocalBusiness. Runs in your browser.
Schema Markup Checker
Check JSON-LD on a page you paste. Same local validator, checker framing for the ranking query.
Frequently asked questions
- Can I block GPTBot in robots.txt?
- Yes. The GPTBot page writes User-agent groups for GPTBot, ChatGPT-User, Google-Extended, and similar AI crawlers.
- Does the schema validator fetch a URL?
- No. Paste JSON-LD or a script tag. Required fields for Product, FAQ, and LocalBusiness are checked locally.
- Are meta titles ranked for me?
- No. You get character and pixel-width checks. Google still rewrites titles.