Free online SEO tools
Client-side SEO utilities: sitemap XML, robots.txt, JSON-LD, and snippet checks. Nothing is fetched from your origin.
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XML Sitemap Generator – Changefreq, Priority & Lastmod
Build a valid sitemap.xml with changefreq, priority, and lastmod. Paste URLs, set values, download. 100% client-side, no upload.
robots.txt parser and tester
Parse robots.txt locally against RFC 9309. Group user-agents, flag syntax issues, and test a URL. Nothing is fetched or uploaded.
XML sitemap validator
Paste sitemap.xml and validate urlset structure, loc URLs, and 50,000 URL / 50 MB guidance. Parsed in the browser.
JSON-LD schema validator
Paste JSON-LD. Check @context, @type, and common required properties for WebApplication, FAQPage, HowTo, and Article.
JSON-LD entity builder
Fill WebApplication, FAQ, and HowTo fields. Download JSON-LD. Built in this tab.
SERP snippet previewer
Preview title and description pixel width the way desktop SERPs truncate. Runs locally.
llms.txt generator
Turn a title, summary, and link list into an llms.txt markdown file. Download in the browser.
Resource hints generator
Build preconnect, dns-prefetch, preload, and prefetch link tags from origins and URLs. Copy HTML.
Heading hierarchy visualizer
Paste HTML and see the h1–h6 outline, skipped levels, and multiple h1s. Parsed with DOMParser.
Meta robots conflict checker
Compare robots meta, X-Robots-Tag, and robots.txt snippets for noindex/nofollow conflicts. Local only.
Social meta validator
Extract Open Graph and Twitter tags from pasted HTML and flag missing title, description, or image.
Breadcrumb schema auditor
Paste BreadcrumbList JSON-LD. Check position order, missing item URLs, and name gaps.
Why client-side seo tools?
Your URL inventory and unpublished HTML should not be stored by a crawl-based builder.