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The ultimate hub of free URL-input checkers — paste your site, get instant audits across accessibility, SEO, performance, security, privacy, and more
Accessibility (ADA & WCAG)
(19)
Industry-standard visual accessibility evaluator — overlays errors, contrast issues, ARIA, and structure on the live page
Free ADA/WCAG/EAA/Section 508/AODA scan with exact fix instructions and PDF reports
Industry gold-standard a11y scanner — Chrome/Firefox extension powered by axe-core, zero false positives
Built into Chrome DevTools — runs accessibility, performance, SEO, and best-practice audits on any URL
Google-hosted Lighthouse — paste any URL for an instant accessibility + performance + SEO score
Test foreground/background color contrast against WCAG AA and AAA standards
Deque-based browser extension that audits live pages with WCAG-mapped explanations
Free trial scan covering accessibility, broken links, browser compat, and standards
Quick WCAG/ADA audit with score and high-level issue summary
Automated accessibility scan with prioritized issues mapped to WCAG criteria
WCAG/RGAA conformance tester with detailed rule-level output
Portuguese government WCAG 2.1 audit with 0-10 quality score
Bulk-scans an entire site for WCAG violations
Simulates how color combos appear to vision conditions
Live AA/AAA grading on any color pair
Renders any URL through eight color-blindness filters
Simulates eight types of color blindness on uploaded images
ADA/WCAG scan with downloadable PDF compliance report
SEO Audits
Free site audit, backlink profile, and keyword rankings — verify ownership for full features
Limited free crawl — surfaces SEO + AI search visibility issues with severity ranking
Neil Patel free SEO suite — site audit, keyword research, competitor analysis
On-page SEO checker, broken link finder, rank tracker, and tech audit
Backlink data, domain authority (DA), and spam score for any URL
Desktop crawler — free up to 500 URLs, the SEO industry's standard auditing tool
Suite of free checkers — backlinks, keywords, page audit, SERP, and more
50+ on-page SEO checks with copy-pasteable fix instructions
Visual SEO crawler with 350+ hints and a free 14-day trial
Official Schema.org validator — checks structured data syntax
Test if your page supports Google rich results — recipes, reviews, FAQs, products
Instant SEO/UX/social audit per URL
Audits URL with traffic, keyword, and backlink overview
Inspects on-page SEO factors with scored report
Scores SEO of any URL with a checklist breakdown
Tests if a URL is allowed or blocked by robots.txt
Validates sitemap.xml structure and listed URLs
Live preview of meta, OG, and Twitter cards for any URL
Preview how your page will appear in Google search results — paste a URL to see the SERP snippet
Performance & Speed
Lighthouse-powered Core Web Vitals report with field + lab data, mobile + desktop
The pro's choice — full waterfall, filmstrip, multi-location, throttled connections
Quick speed test with grade, page size, and request count from multiple regions
Test from 233+ checkpoints worldwide with a clean, easy-to-read report
Test from 14 global locations — TTFB, page weight, request count
Tests TTFB and load time per global region
Audits front-end performance and code quality
Suite of free speed, asset, and CDN tests per URL
Bulk-runs PageSpeed Insights across an entire site
Visualizes every third-party request as a bubble graph
Free Core Web Vitals + PSI report per URL
Lighthouse, filmstrip, and waterfall in browser
Security Headers & HTTPS
Comprehensive HTTP security headers + TLS scan with letter grade — Mozilla-maintained
Scott Helme's classic security headers grading service — A+ to F report
Qualys deep-dive TLS/SSL audit — protocols, ciphers, vulns, certificate chain
PCI DSS, HIPAA, NIST compliance check + SSL grading + email server test
Tests modern web standards adoption — IPv6, DNSSEC, TLS, security options
Audits your Content-Security-Policy header for bypass risks and weak directives
Quick certificate chain installer/expiry/validity check
Diagnose SSL cert issues, intermediate chain, and revocation status
Finds why your HTTPS page shows mixed content warnings
Open-source TLS server scanner with detailed protocol/cipher info
Lists supported TLS versions and ciphers
Decodes cert chain and validates SSL setup
Checks SSL cert installation, expiry, and chain
Tests TLS/SSL configuration with letter grade
Verifies HTTP/2 support and ALPN negotiation
Verifies HTTP/3 / QUIC support on any host
Analyzes Content-Security-Policy directives
Validates DNSSEC chain of trust
Diagnoses DNSSEC signing and key issues
Check whether a domain is in the Chromium HSTS preload list and submit it for inclusion
Privacy & Trackers
Investigative-journalism privacy inspector — surfaces ad-trackers, fingerprinting, session-recording
Swedish privacy scanner — third-party requests, cookies, headers, GDPR posture
Free cookie audit — categorizes cookies and tracking scripts loaded by your site
Scan your site for cookies, third-party trackers, and consent compliance issues
Free third-party cookie + tracker checker with consent-banner check
Scans a page for all cookies with GDPR breakdown
Tracks browser cookie behavior changes per vendor
Database of third-party scripts and their performance cost
Maps every third-party domain a page calls
Tests browser fingerprinting and data leaks
HTML, CSS & Code Validators
Official W3C HTML validator — Nu Html Checker — the gold standard for HTML
Official Jigsaw-based CSS validation against CSS3 and current modules
W3C's modern HTML5 validator — checks the actual conformance rules
Recursively checks anchor + image links for broken URLs
Validates Atom + RSS feeds against the spec
Verify sitemap XML structure conforms to sitemaps.org spec
Bulk HTML + accessibility validator using W3C Nu Validator + axe
Validates AMP HTML against the AMP specification
Tests if a URL is valid AMP for Google Search
Strict HTML5 / Living Standard validator
Validates JSON against a JSON Schema
Validates XML against DTD or XSD
Audits favicon coverage across all platforms
DNS, Email & Domain
Global DNS propagation lookup — see your DNS records from 100+ locations
Send a test email and get a 0–10 spam score with SPF/DKIM/DMARC + content checks
Check your SPF, DKIM, DMARC, BIMI records and get fix instructions
DMARC, SPF, DKIM, BIMI lookup + email auth checker
Official ICANN registration data lookup — authoritative WHOIS
30+ DNS, IP, WHOIS, reverse-IP, traceroute, and propagation tools
Validates SPF record syntax and lookup count
Looks up and tests SPF record
Looks up and tests DMARC record
Looks up and tests DKIM selector
Inspects DKIM record by selector
Verifies BIMI record and VMC certificate
Live demo of DMARC alignment per email message
Sends test mail and grades deliverability
All-in-one DNS, SMTP, SSL, and HTTP test
Tests DNS zone correctness with a thorough report
Pull and parse the DMARC TXT record for any domain — verifies syntax and quarantine/reject policy
Tech Stack & WHOIS
Identify the technologies powering any website — CMS, JS frameworks, e-commerce
Hosting history, server info, certificate details, risk rating
Identify the hosting provider, name servers, and IP for any domain
Whois, hosting history, reverse-whois, DNS history — limited free tier
Reports the technologies used by a site
Free WhatWeb fingerprint scan per URL
Public WHOIS lookup for any domain
Detects WordPress theme and active plugins
Malware & Safety
Free remote malware + blacklist scanner with status, OWASP, software outdated
70+ antivirus/URL-scanner aggregated verdict on any URL or file
Sandbox-style URL scanner — screenshots, requests, indicators of compromise
Check Google's transparency report to see if a site is flagged as unsafe
Server-side malware + blacklist scan with PDF report
Free remote scan for malware, blacklists, and known vulnerabilities
Symantec/Norton URL reputation lookup
Free sandbox detonation of URLs and files
Scans any URL for malware and phishing
Webroot URL and IP threat reputation
Fortinet category and reputation lookup
Cisco Talos IP and domain reputation
Checks domain or IP against 100+ DNSBLs
Mobile & Responsive
Quick browser-based responsive viewport tester
Free responsive preview across real device viewports
Classic 4-up screenshot mock — desktop, laptop, tablet, mobile preview
Cross-browser testing on 3000+ real browser/OS combinations
Test your site across many screen sizes — TVs, desktops, tablets, phones
Tests mobile readiness with 5G/3G simulations
Bulk mobile-friendliness scan per site
Previews URL on common mobile device frames
Social, OG & Sharing
Preview how your site looks when shared on Facebook, LinkedIn, X, Discord
Official Facebook OG inspector — clear cache and rerender previews
Preview how a URL renders in LinkedIn shares + clear cache
Live preview Google + social card meta tags as you edit
Live preview of meta, OG, and Twitter card tags
Broken Links & Crawling
Free recursive crawl that surfaces every 404 + redirect on your site
Online dead-link checker for full sites and individual pages
Combined SEO crawler + broken-link finder
Free Ahrefs tool — outbound + inbound broken links from any URL
GPL CLI/GUI checker that crawls any site for broken refs
Crawls site and reports broken links
Up to 3,000 pages free broken-link crawl
Bulk URL & redirect checker — shows full redirect chain, HTTP status, and response headers for any URL
Trace HTTP/HTTPS redirect path step-by-step — verify 301/302 chains, canonical destination, and final status code
Check whether a URL is archived on the Internet Archive — returns the most recent snapshot timestamp
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