[Crawl-Date: 2026-04-06]
[Source: DataJelly Visibility Layer]
[URL: https://datajelly.com/seo-tools]
---
title: Free SEO Tools - DataJelly
description: Free SEO tools to validate, test, and optimize your website. Check structured data, sitemaps, robots.txt, metadata, SSL certificates, and more.
url: https://datajelly.com/seo-tools
canonical: https://datajelly.com/seo-tools
og_title: DataJelly - The Visibility Layer for Modern Apps
og_description: Rich social previews for Slack & Twitter. AI-readable content for ChatGPT & Perplexity. Zero-code setup.
og_image: https://datajelly.com/datajelly-og-image.png
twitter_card: summary_large_image
twitter_image: https://datajelly.com/datajelly-og-image.png
---

# Free SEO Tools - DataJelly
> Free SEO tools to validate, test, and optimize your website. Check structured data, sitemaps, robots.txt, metadata, SSL certificates, and more.

---

Free Tools
## SEO Tools

Validate, test, and optimize your website for search engines and AI crawlers.

## Must Have Tools

Essential diagnostics every site should run

file:///seo-tools/visibility-testfile:///seo-tools/http-debugfile:///seo-tools/site-crawlerfile:///seo-tools/redirects-auditfile:///seo-tools/snapshot-asset-testfile:///seo-tools/page-validatorfile:///seo-tools/social-card-previewfile:///seo-tools/page-speed-analyzerfile:///seo-tools/dns-records-viewer

## Audit & Testing

Comprehensive tools to analyze how search engines and AI see your site

file:///seo-tools/visibility-testfile:///seo-tools/http-debugfile:///seo-tools/site-crawlerfile:///seo-tools/bot-testfile:///seo-tools/redirects-auditfile:///seo-tools/snapshot-asset-testfile:///seo-tools/site-audit

## Validators

Validate your SEO configuration files and markup

file:///seo-tools/structured-data-validatorfile:///seo-tools/sitemap-validatorfile:///seo-tools/robots-txt-testerfile:///seo-tools/page-validator

## Analyzers

Analyze metadata, performance, and page content

file:///seo-tools/social-card-previewfile:///seo-tools/page-speed-analyzerfile:///seo-tools/website-screenshot

## Infrastructure

Check DNS, SSL, and server configuration

file:///seo-tools/ssl-checkerfile:///seo-tools/http-header-checkerfile:///seo-tools/dns-records-viewer

## Need Automated SEO Monitoring?

DataJelly automatically monitors your website's SEO health and alerts you to issues before they impact your rankings.

Get Started FreeView Pricing

## Discovery & Navigation
> Semantic links for AI agent traversal.

* [DataJelly Edge](https://datajelly.com/products/edge)
* [DataJelly Guard](https://datajelly.com/products/guard)
* [Features](https://datajelly.com/#features)
* [Pricing](https://datajelly.com/pricing)
* [Visibility Test](https://datajelly.com/visibility-test)
* [Prerendering](https://datajelly.com/prerendering)
* [Prerender Alternative](https://datajelly.com/prerender-alternative)
* [Lovable SEO](https://datajelly.com/lovable-seo)
* [Visibility Layer Guide](https://datajelly.com/guides/visibility-layer)
* [How Snapshots Work](https://datajelly.com/guides/how-snapshots-work)
* [AI SEO Platform](https://datajelly.com/ai-seo-platform)
* [Bot Detection](https://datajelly.com/bot-detection)
* [Dashboard](https://dashboard.datajelly.com/)
* [SEO Tools](https://datajelly.com/seo-tools)
* [Visibility Test](https://datajelly.com/seo-tools/visibility-test)
* [Site Audit](https://datajelly.com/seo-tools/site-audit)
* [Bot Test](https://datajelly.com/seo-tools/bot-test)
* [Social Card Preview](https://datajelly.com/seo-tools/social-card-preview)
* [Robots.txt Tester](https://datajelly.com/seo-tools/robots-txt-tester)
* [Sitemap Validator](https://datajelly.com/seo-tools/sitemap-validator)
* [Structured Data Validator](https://datajelly.com/seo-tools/structured-data-validator)
* [HTTP Header Checker](https://datajelly.com/seo-tools/http-header-checker)
* [Page Speed Analyzer](https://datajelly.com/seo-tools/page-speed-analyzer)
* [SSL Certificate Checker](https://datajelly.com/seo-tools/ssl-checker)
* [DNS Records Viewer](https://datajelly.com/seo-tools/dns-records-viewer)
* [Guides](https://datajelly.com/guides)
* [Getting Started](https://datajelly.com/guides/getting-started)
* [SPA SEO Guide](https://datajelly.com/guides/spa-seo)
* [JavaScript SEO Guide](https://datajelly.com/guides/javascript-seo)
* [SSR Guide](https://datajelly.com/guides/ssr)
* [Search Engine Crawling Guide](https://datajelly.com/guides/search-engine-crawling)
* [Lovable SEO Guide](https://datajelly.com/guides/lovable-seo)
* [AI SEO Testing Guide](https://datajelly.com/guides/ai-seo)
* [SEO Testing Guide](https://datajelly.com/guides/seo-testing)
* [SERP Tracking Guide](https://datajelly.com/guides/serp-tracking)
* [Security Testing Guide](https://datajelly.com/security)
* [About Us](https://datajelly.com/about)
* [Contact](https://datajelly.com/contact)
* [Blog](https://datajelly.com/blog)
* [Terms of Service](https://datajelly.com/terms)