Website Checker and SEO Audit
Enter one URL to combine HTTP, DNS, SEO, robots, Sitemap, technology and Google performance findings. Detect WordPress and discover a public article for Discover checks.
SEO and WebmasterSingle Input · Fix List
Toolkits by Role
Site Operators Toolkit
Diagnostics, SEO, speed and content — one toolkit for running an independent site.
17 tools✓ No signup needed
Tools in this kit
Google Discover Readiness Checker
Check an article's representative image size, pixel count, large-image preview permission and indexing directives.
SEO and WebmasterMain image & preview
HTML Size and Inline Code Analyzer
Inspect supplied HTML size and the contribution of inline scripts and styles.
SEO and Webmaster本地处理
Googlebot Simulator
Free Googlebot simulator: fetch a page as the smartphone or desktop Googlebot, run its JavaScript, and compare the raw HTML with what Google actually sees after rendering: text, title, canonical, noindex, links and structured data. It highlights JavaScript-dependent content and resources blocked by robots.txt, with fixes.
SEO and WebmasterFree · follows robots.txt
Website Speed Test
Measure server-side HTML response time and download size for a public webpage.
SEO and Webmaster在线查询
DNS Lookup
Query A, AAAA, CNAME, MX, TXT, NS, SOA and CAA records with response status, TTL and resolver evidence.
SEO and Webmaster在线查询
HTTP Redirect & Status Checker
Free HTTP redirect checker and HTTP status checker: inspect a public URL's status code, redirect chain (301, 302, HTTP to HTTPS), final address and response headers.
SEO and Webmaster在线查询
Website SEO Checker
Free website SEO checker: test any URL for title, meta description, canonical, indexing, heading outline, structured data, viewport, hreflang and images, with a SERP preview and fixes.
SEO and WebmasterSEO & Discover
Technology stack detector
Detect website site builders, frontend frameworks, e-commerce components, analytics, ads, and CDNs. Combines HTTP, HTML, and isolated browser dynamic page evidence, with optional Gemini AI analysis.
SEO and WebmasterDynamic Page Evidence
Search and AI Crawler Access Test
Request a public page using selected search or AI crawler User-Agent strings.
SEO and Webmaster在线查询
SSL certificate checker
Check a website’s SSL/TLS certificate: trust, hostname match, days to expiry, issuer, full chain, SAN names, TLS 1.0–1.3 support, HSTS and OCSP stapling.
E-commerce & Marketing本地计算
A/B Test Significance Calculator
Free A/B test significance calculator: enter visitors and conversions for each variant to get conversion rates, lift with confidence intervals, the p-value and a clear verdict. Supports several variants (Holm correction), one- or two-sided tests, a sample ratio mismatch (SRM) check and how many more visitors you need.
SEO and WebmasterLocal · A/B testing
A/B Test Sample Size Calculator
Free A/B test sample size calculator: from the baseline conversion rate, minimum detectable effect (MDE), confidence and power, get the visitors needed per variant and the test duration in days and whole weeks from your daily traffic. Several variants are Bonferroni-corrected, with a table of sample sizes for other MDEs.
SEO and WebmasterLocal · A/B testing
A/B Testing Setup Guide
Setup guide for XunL Experiments: use the JS SDK on Shopify, Webflow, Wix, Squarespace, Google Tag Manager or a custom site, or the WordPress plugin; covers visitor consent, goals, single-page apps, the signed API for confirming inquiries from Node.js, Python or PHP, and how to verify the connection.
SEO and Webmaster公开说明 · A/B 实验
Meta Title and Description Checker
Preview a page title, URL and description while reviewing wording and approximate length.
SEO and Webmaster本地处理
URL Slug Generator
Normalize a title into a readable URL slug for content publishing.
SEO and Webmaster本地处理
Meta Tag Generator
Generate escaped title, description, canonical, Open Graph and Twitter Card tags in your browser.
SEO and Webmaster本地计算