Free SEO Tools

13 specialist SEO tools that check any public URL in seconds. No account required, no software to install, no daily limits. Just paste a URL and get results.

What Is Prafero SEO Space?

SEO Space is a collection of 13 free, browser-based SEO tools built to check any public URL instantly. Each tool focuses on one specific area of on-page or technical SEO — giving you a precise, actionable result rather than a generic score with no explanation.

There is nothing to install. No account to create. No email address required. No daily check limits. Paste any URL — your own pages, competitor pages, client pages — and get real-time results pulled directly from the live page.

Every tool in SEO Space is organized into three areas: indexation and crawl, page structure, and technical and structured data. Together, they cover every major on-page SEO signal that affects how Google discovers, understands, and ranks a page.

All 13 Free SEO Tools

Indexation and Crawl Tools

These three tools check whether Google can actually find and index your pages. A page that is blocked from crawling or indexing will not rank — regardless of how well optimized everything else is.

Noindex Checker Detect noindex and nofollow directives on any URL. Checks both the meta robots tag and the X-Robots-Tag HTTP header — the two places a noindex directive can hide. One misconfigured tag can silently remove an entire page from Google's index.

Robots.txt Checker Fetch and analyze any domain's robots.txt file. View all disallow rules, crawl directives, user-agent blocks, and sitemap declarations. Google deprecated its own robots.txt testing tool in 2023 — Prafero fills that gap.

Sitemap Checker Locate and validate any domain's XML sitemap. Checks accessibility, format validity, and total URL count. A malformed or inaccessible sitemap slows Google's ability to discover new and updated pages on your site.

Page Structure Tools

These five tools check the on-page elements that tell Google what a page is about. Get any of these wrong and Google either misunderstands the page or penalizes it for duplicate content, thin signals, or poor accessibility.

SEO Score Checker: Audit any URL across all major on-page SEO factors and get a clear health score. Covers title tag, meta description, H1, heading structure, canonical, indexability, internal links, image alt text, Open Graph tags, and content length — in one instant scan.

Meta Tag Analyzer: Extract and evaluate every meta tag on any URL. Title tag, meta description, canonical, Open Graph, Twitter Card, robots, viewport — all in one place. See exactly what Google and social platforms read when they crawl your page.

Heading Tag Analyzer: Pull every H1 through H6 tag from any URL and review the full heading hierarchy. Detect missing H1s, multiple H1s, and broken heading structure that dilutes topical relevance signals.

Alt Text Checker: Audit every image on any URL for missing or empty alt attributes. Google cannot interpret images without alt text — they contribute nothing to the page's topical relevance. Missing alt text also fails WCAG 2.1 accessibility standards.

URL Analyzer: Analyze any URL for length, depth, keyword usage, special characters, and SEO-friendly formatting. URLs are a lightweight but real ranking signal — and a poorly structured URL creates lasting issues across canonicalization and link equity.

Technical and Structured Data Tools

These five tools check the technical implementation signals that control rich results, international SEO, social sharing, and link health. These are the issues that take the longest to find manually — and the fastest to check with the right tool.

Hreflang Checker: Validate hreflang tags on any URL for international SEO. Detect missing return tags, invalid ISO language codes, and x-default implementation errors. A missing return tag between two language variants is one of the most common international SEO mistakes.

Schema Markup Checker: Detect JSON-LD and Microdata structured data on any URL. Validate schema types, check for implementation errors, and verify rich snippet eligibility. Faster than Google's Rich Results Test with no account required.

Open Graph Checker: Preview how any URL appears when shared on Facebook, LinkedIn, and WhatsApp. Check og:title, og:description, og:image presence and dimensions. A missing OG image means every social share of that page looks broken.

Broken Link Checker: Scan any webpage and find all broken internal and external links returning 404, 410, or 500 errors. Broken links waste crawl budget, damage user experience, and leak link equity to dead endpoints.

Internal Link Analyzer: crawls any URL to map all internal links, detect orphan pages, and find broken internal link issues. Internal linking is how Google discovers pages and how PageRank flows through your site — a poor internal link structure directly limits rankings.

Why These Tools Are Different

Most free SEO tools online make you choose between depth and accessibility. The powerful ones require an account, cap your daily checks, or push you toward a paid plan after three uses. The truly free ones are shallow — a pass/fail checklist with no explanation of what the result means or what to do about it.

Prafero SEO Space is built differently across four dimensions:

Genuinely free — not a free trial. Every tool in SEO Space is permanently free. There is no premium tier, no usage cap, and no account required. Semrush limits free users to three SEO checks per day. Seobility hits a query limit and pushes you to register. HubSpot's Website Grader requires an email address for full results. Prafero requires nothing.

Works on any public URL — including competitors. Google Search Console only shows data for sites you own and have verified. Prafero works on any publicly accessible URL. Audit your own pages, check how a competitor has implemented their schema, verify a client's hreflang setup before you take them on — all without needing access to their account.

Real-time data — never cached. Every check fetches the live HTML of the URL at the moment you run it. Results are never pulled from a crawl cache that is days or weeks old. If you push a change and run the tool again thirty seconds later, the new result reflects your change.

Results that explain themselves. A raw pass/fail result without context is not useful. Every Prafero tool explains what each factor means, why it matters for search visibility, and what to do when something fails. The goal is not just to show you a problem — it is to help you understand it well enough to fix it.

Who Uses SEO Space

SEO practitioners and agencies run fast pre-publish audits, validate client site implementations, check competitor pages for technical signals, and catch issues before they become ranking problems. No account setup — open a tool, paste a URL, get results.

Developers and engineers verify that canonical tags, noindex directives, and structured data implementations are correct in the live environment after deployment. Check that robots.txt changes have not accidentally blocked critical pages. Confirm that hreflang return tags are in place before a multilingual launch.

Content marketers and bloggers, check heading structure before publishing, verify Open Graph tags so social shares look correct, confirm meta descriptions are within character limits and present on every page. No SEO expertise required — every result is explained in plain language.

Founders and site owners Get a clear picture of your site's technical SEO health without paying for an enterprise audit platform. Use SEO Space as a regular maintenance routine — check key pages monthly and catch problems before they affect rankings.

Start With the Right Tool

Not sure which tool to run first? Here is a quick guide by situation:

Just launched a new page? Run the SEO Score Checker first. It covers all major on-page factors in one scan and tells you exactly what is missing before Google crawls the page.

Worried a page is not being indexed? Run the Noindex Checker to rule out accidental noindex directives, then check the Robots.txt Checker to confirm the page is not blocked at the crawl level.

Building or auditing a multilingual site? Start with the Hreflang Checker to validate return tag implementation across all language variants.

Preparing content for social sharing? Run the Open Graph Checker to confirm OG image, title, and description render correctly on LinkedIn, Facebook, and WhatsApp before publishing.

Auditing a site you have just taken on? Start with the Broken Link Checker and Internal Link Analyzer to map link health, then run the Schema Markup Checker to see what structured data is in place.