Skip to contentResolve DNS records, inspect SSL certificates and run HTTP tests — server routes clearly marked.
API Studio bundles DNS lookup, SSL certificate viewer and network helpers. Server-dependent modes are labeled; local generators stay in the browser.
DNS Lookup online — free
Resolve A, AAAA, MX, TXT and CNAME records.
SSL Certificate Viewer online — free
Inspect TLS certificate for a hostname.
CORS Tester — debug cross-origin requests
Test CORS headers and preflight responses via proxy — fix API integration blockers.
robots.txt Tester online — free
Fetch and validate robots.txt for a site.
Free developer tools online
Format JSON, test regex, encode URLs, decode JWT and more — everyday coding utilities in the browser.
Security & crypto tools
Hash, encode, decode and generate secrets locally in your browser.
Email & HTML extraction tools
Extract emails from text, normalize addresses, parse HTML to plain text and build vCards — locally.
Privacy tools — local-first browser utilities
Tools that avoid cloud upload — passwords, hashes, PDF, JWT and OCR on your device.
Yes — all guides link to free browser tools with no account required.
Most tools process data locally in your browser.
