A collection of free utilities for developers. All tools run entirely in your browser — your data never leaves your device.
Query DNS records and WHOIS data
Check DNS propagation across global servers
Test HTTP latency and availability
Inspect HTTP headers and responses
Test HTTP status codes and headers
Follow and inspect redirect chains
Calculate network subnets and ranges
Detect leaked secrets and high-entropy tokens
Generate secure passwords and passphrases
Analyze password entropy and crack time
Decode and inspect JSON Web Tokens
Check SSL certificate details
Check IP address reputation and flags
Base64 encoder, hash generator, regex tester, and more.
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