Website Tools
Tools for testing and previewing live websites.
Website Multi-Device Preview
Render any URL on iPhone, iPad, MacBook, and Desktop at once. Spot layout bugs across breakpoints in one view.
Open tool NEWOG Link Preview
See how any URL will render when shared on Twitter, LinkedIn, Slack, iMessage, and Discord. Catches missing OG tags before you post.
Open tool NEWHTTP Headers Inspector
Inspect response headers, the full redirect chain, and a security-header score (HSTS, CSP, X-Frame-Options) for any URL.
Open tool NEWSSL Certificate Checker
Check who issued a domain's certificate, when it expires, what alt names it covers, and which TLS version negotiated.
Open tool NEWDNS Lookup
Get A, AAAA, MX, TXT, CNAME, NS, and SOA records for any domain in one view.
Open tool NEWWHOIS Lookup
See a domain's registrar, registration date, expiry, status flags, and nameservers. Powered by RDAP — the modern WHOIS replacement.
Open tool NEWRobots.txt & Sitemap Inspector
Fetch and parse any site's robots.txt, list every sitemap referenced, and peek inside each sitemap.
Open tool NEWURL to PDF
Render any URL as a clean, full-page PDF. Server-side capture handles JavaScript-heavy pages that the browser print dialog mangles.
Open tool NEWOG Image Generator
Generate a 1200×630 social card from any URL — auto-pulls title and description. Drop into your og:image meta tag.
Open tool NEWPage Weight Analyzer
See total bytes, requests, and the 10 largest assets. Flags render-blocking resources and oversized images.
Open tool NEWPage Speed Audit
Lighthouse-powered scorecard. Performance, Accessibility, Best Practices, SEO, plus Core Web Vitals (LCP, INP, CLS) from real-user data.
Open tool NEWMeta Tag Inspector
See every meta tag of any URL in one view — title, description, canonical, robots, OG, Twitter Card, hreflang, JSON-LD, headings. With length hints.
Open tool NEWColor Contrast Checker
WCAG AA / AAA contrast ratio for any foreground/background pair. Live preview, pass-fail badges, and a one-click suggested fix.
Open tool NEWJWT Decoder
Paste any JSON Web Token to see its header and payload, claims, and expiry countdown. Runs in your browser — nothing uploaded.
Open tool NEWRegex Tester
Test JavaScript regular expressions live. Highlighted matches, capture groups, replace preview. Pure browser.
Open tool NEWCORS Tester
Will a browser at your origin be able to call this URL? See preflight + actual CORS headers and the would-it-work verdict.
Open tool NEWHTTP Bulk Status Checker
Paste up to 50 URLs and get status, redirects, final URL, and timing for all of them. CSV export.
Open tool NEWBroken Link Checker
Single-page audit — extract every <a href> and check it. Filter to broken-only, export the table as CSV.
Open tool NEWSPF / DMARC / DKIM Checker
Audit a domain's email authentication records. Spot misconfigurations that send your offer letters and invoices to spam.
Open tool NEWDNS Propagation Checker
Query a DNS record across Cloudflare, Google, Quad9, and OpenDNS at once. See if your change has propagated.
Open tool NEWTech Stack Detector
Identify the CMS, framework, CDN, analytics, and payment tools behind any public site by sniffing HTTP headers and HTML signatures.
Open tool NEWSubdomain Finder
Enumerate subdomains of any domain via certificate transparency (CT) logs. Filter, copy, download. No API key needed.
Open tool NEWDiff Viewer
Compare two blocks of text or JSON. Unified or split view, pretty-print JSON, ignore whitespace. Browser-only.
Open tool NEWEmail Header Analyzer
Paste raw email headers — see route hops, timing, SPF/DKIM/DMARC verdicts. Useful when an email lands in spam or arrives late.
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