SSL / OpenSSL Tools

Browser-Based OpenSSL Tools for Developers

OpenSSL is the gold standard for cryptographic operations in the terminal. This tool brings the most common OpenSSL commands to your browser — no installation, no command line, no data sent to any server.

Certificate Inspector — openssl x509 -text

Paste any PEM-format X.509 certificate and see all its fields instantly:

• Subject & Issuer – Common Name (CN), Organization (O), Country (C)
• Subject Alternative Names (SANs) – all domains the cert is valid for
• Validity period – Not Before and Not After dates with expiry countdown
• Fingerprints – SHA-1 and SHA-256 fingerprints (for verification)
• Key info – Algorithm (RSA/EC), key size, public key modulus
• Serial number – unique certificate identifier

Hash Generator — openssl dgst -sha256

Compute cryptographic hashes of any text string — equivalent to:

• openssl dgst -md5 file.txt → MD5
• openssl dgst -sha256 file.txt → SHA-256
• openssl dgst -sha512 file.txt → SHA-512

Useful for verifying file integrity, password hashing (for comparison only), or generating checksums.

HMAC Generator — openssl dgst -hmac

Generate HMAC (Hash-based Message Authentication Code) for API authentication, webhook signature verification, and data integrity checks. Equivalent to openssl dgst -sha256 -hmac "secret" file.txt.

AES Encrypt / Decrypt — openssl enc -aes-256-cbc

AES-256 is the industry-standard symmetric encryption algorithm. Use it to encrypt sensitive data with a shared secret key. Output is Base64-encoded for easy transport.

• AES-256-CBC — most commonly used; requires key + IV
• AES-256-CFB — streaming mode; better for real-time data