WebDiag tools
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More than 140 free tools for analyzing, diagnosing and improving your website. Choose a tool or find it through search.
For example: robots.txt, sitemap, redirects, speed, HTTPS, images
All tools (125)
Single Page Technical AuditRuns a bounded technical audit of one public URL: HTTP, redirects, HTML, metadata, indexability, Open Graph, JSON-LD, security headers, robots.txt, and sitemap.xml.Bounded Site AuditRuns an authenticated, project-bound crawl of one origin: up to 100 public HTML pages with robots.txt handling, no JavaScript execution, and no claim of complete site coverage.Meta Tags CheckerChecks page metadata as one SEO signal: title, description, robots, canonical, H1 summary, Open Graph, Twitter/X, and JSON-LD coverage.SERP Snippet PreviewBuilds a search snippet preview from real HTML: display URL, title, description, fallback sources, and snippet quality warnings.Open Graph and Twitter/X Card PreviewChecks rich previews for social networks and messengers: Open Graph, Twitter/X Card, fallback title/description, image URL, and missing fields.Canonical CheckerChecks canonical for a single URL: link rel=canonical presence, absolute/relative href, match with the final URL, and noindex signals.Hreflang CheckerChecks page hreflang markup: alternate links, x-default, self-reference, duplicate language codes, and structural multilingual SEO consistency.Robots.txt TesterChecks robots.txt for a single URL: file availability, whether the path is allowed for a user-agent, matching rule, and Sitemap directives.Robots.txt GeneratorGenerates robots.txt from explicit rules: user-agent, Allow/Disallow, Sitemap, and Crawl-delay without fetching the site or making hidden assumptions.Sitemap.xml ValidatorChecks a sitemap.xml or sitemap index: availability, XML validity, URL count, and whether a target page is listed.Sitemap.xml Generator from URL ListGenerates sitemap.xml from a URL list with optional lastmod, changefreq, and priority, escaping XML and validating HTTP(S) URLs.Redirect Chain CheckerChecks the HTTP status, final URL, and redirect chain for a single page through the safe WebDiag API.Bulk HTTP Status CheckerChecks HTTP statuses and redirects for up to 50 URLs through the safe WebDiag API with an isolated result for each address.Broken Link CheckerChecks links on one page through a bounded static HTML scan: internal and external HTTP(S) URLs, 4xx/5xx, unreachable targets, and redirects without full-site crawling.Broken Image CheckerChecks broken images on one page: img, srcset, picture/source, and social images, HTTP statuses, redirects, and non-image responses.Image SEO AuditChecks page image SEO signals: alt text, linked images, dimensions, lazy-loading, responsive markup, and social preview images.Heading Structure CheckerChecks the H1–H6 heading structure in static HTML: H1 count, skipped levels, empty headings, and the full page outline without splitting H1 into a weak standalone tool.Internal and External Link AnalyzerAnalyzes page link structure: internal, external, same-page, mailto/tel links, rel=nofollow/sponsored/ugc, and target=_blank without noopener.Keyword and Phrase Frequency AnalyzerAnalyzes visible page text: word, bigram, and trigram frequency, term density, and overuse risk as a content-audit signal rather than SEO magic.Readability AnalyzerEvaluates visible-text readability with multilingual heuristics: word count, sentences, paragraphs, long sentences, reading time, and simplification recommendations.
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