Website & SEO developer tools
Technical SEO problems are usually invisible until a crawler or a search result reveals them: a robots.txt rule that blocks more than intended, hreflang links that point at a page that no longer links back, a sitemap with a malformed URL, or JSON-LD structured data with a typo'd Schema.org property. These tools check that configuration against a specific URL or file before you deploy it and find out from a drop in crawling or rich results.
The robots.txt generator and tester runs your crawl rules against one URL to show what's allowed and blocked before deploying the file, and the Hreflang checker compares hreflang links across language pages to find edges missing in one direction. The Sitemap generator and validator builds XML sitemaps from a URL list and checks existing files for errors, and the JSON-LD structured data helper validates structure and Schema.org terms locally. The Meta tag generator drafts title, description and Open Graph tags with a sharing preview.
5 tools
All Site & SEO Dev Tools tools
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robots.txt generator and tester
Test crawl rules against one URL before deploying your robots.txt file
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Hreflang checker
Compare hreflang links across language pages and find missing edges
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Meta tag generator
Draft title, description and Open Graph tags with sharing previews
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Sitemap generator and validator
Generate XML sitemaps from URL lists and validate existing sitemap files
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JSON-LD structured data helper
Validate JSON-LD structure and compare terms against an offline Schema.org snapshot
Site & SEO Dev Tools tools FAQ
Reading a robots.txt file by eye is error-prone once it has more than a couple of rules, especially with wildcards. The robots.txt generator and tester runs your rules against a specific URL so you can confirm exactly what's allowed and blocked before the file goes live.
Hreflang links need to be reciprocal: if page A links to page B as an alternate, page B must link back to page A, or search engines may ignore the annotation. The Hreflang checker compares hreflang links across a site's language pages and finds edges that are missing in one direction.
A misspelled Schema.org property name, a missing required field, or a nesting mistake can make otherwise valid JSON parse fine while still failing structured data requirements. The JSON-LD structured data helper checks structure and Schema.org terms locally, without sending the markup anywhere.