Free Crypto & Security Online
15 free tools — no signup required
Cryptography and network security tools for developers and IT professionals. Generate MD5, SHA-256, and bcrypt hashes. Encrypt and decrypt data with AES. Check SSL certificates, look up DNS records, query WHOIS data, and analyze password strength. All operations run client-side for security.
Hash Generator
Generate MD5, SHA-1, and SHA-256 hashes from any input text.
Text Encryption/Decryption
Encrypt and decrypt text using AES encryption.
ROT13 Encoder
Encode and decode text using the ROT13 substitution cipher.
Caesar Cipher
Encrypt and decrypt text using the Caesar cipher with custom shift.
Password Strength Checker
Check how strong your password is and get improvement suggestions.
Checksum Calculator
Calculate and verify file checksums (MD5, SHA-1, SHA-256).
IP Address Lookup
Look up your public IP address and basic network information.
WHOIS Lookup
Look up domain registration information.
HMAC Generator
Generate HMAC authentication codes using various hash algorithms.
Bcrypt Hash Generator
Generate and verify bcrypt password hashes with configurable rounds.
SSL Certificate Checker
Check SSL certificate details, expiry date, and chain validity.
CSP Header Generator
Generate Content Security Policy headers for your website.
Random Bytes Generator
Generate cryptographically secure random bytes in hex or base64.
RSA Key Pair Generator
Generate RSA public/private key pairs for encryption.
DNS Lookup
Look up DNS records for any domain: A, AAAA, MX, TXT, CNAME, and NS.