Security & Network Tools
Free security tools including password strength, IP lookup, JWT decoding, Permissions-Policy and CSP headers, TOTP, AES encryption, and What Is My IP.
TLS Cipher Suite Checker
Look up cipher suites in the IANA registry and flag weak tokens
Diceware Passphrase Generator
Random word-based passphrase, easy to type by hand, 3 to 10 words, free.
Password Generator
Strong random passwords, 8 to 128 characters, with entropy in bits.
16-Character Password Generator
Random 16-character passwords that clear NIST's 15-character minimum.
Random PIN Generator
Random 4 to 12 digit PINs, with the option to skip 0000 and 1234.
Wi-Fi Password Generator
Strong WPA2/WPA3 passphrase, 8 to 63 characters, easy to type.
PGP Key Fingerprint Calculator
GPG fingerprint and key ID from an armored public key
JWT Decoder
Inspect a token's header, claims and expiry locally.
Content-Security-Policy Generator
Generate and validate CSP response headers locally
CORS Preflight Checker
Simulate the browser CORS decision from pasted headers
Permissions-Policy Generator
Control browser feature delegation with allowlists
Security Headers Analyzer
Check pasted response headers against OWASP guidance
Cache-Control Analyzer
Explain Cache-Control directives, conflicts and freshness lifetime
Set-Cookie Inspector
Parse Set-Cookie headers and flag SameSite, prefix and size problems
Password Entropy Calculator
Entropy in bits for random passwords and Diceware passphrases
Password Strength
Test password strength and security
IP Lookup
Look up IP address details and location
TOTP Code Generator
Live 2FA authenticator codes from a Base32 secret
otpauth:// URI Parser & Builder
Parse or build TOTP/HOTP key URIs
Encrypt / Decrypt (AES)
Password-protect text or a file locally
JWT Expiry & Cookie Size Calculator
Lifetime from exp and iat, plus token size against the 4096-byte cookie limit
What Is My IP
Find your public IP address
Bitcoin Address Validator: Base58, Bech32, Bech32m | TNAADO
Free Bitcoin address validator: checks Base58Check and Bech32/Bech32m checksums in your browser. Format and checksum only, not whether it is funded or owned.
Ethereum Address Checksum Validator (EIP-55)
Free Ethereum address checksum checker and converter (EIP-55) for every EVM chain. Format and checksum only: cannot tell if an address exists or holds funds.