Validation

Audit heading structure from a live URL or pasted HTML, then flag skipped levels, multiple h1 usage, style-only heading abuse, and title metadata drift

Security

Generate hash values (MD5, SHA1, SHA256, SHA512)

Validation

Validate phone numbers from multiple countries including China, US, and more with detailed formatting and carrier info

Validation

Validate postal codes from multiple countries including US ZIP, UK Postcode, Canada, and more

Security

Decrypt specific fields in CSV data using various decryption methods to restore encrypted information

Security

Encrypt specific fields in CSV data using various encryption methods to protect sensitive information

Security

Paste a .env file and get a staged secret-rotation plan. Detects database URLs, API keys, auth tokens, private keys, cloud credentials, payment keys and encryption secrets, scores each by exposure and age, and schedules them across a 4-week rotation timeline with a dual-key checklist and a generated .env.example. Optional last-rotated dates and a configurable cadence (30/90/180/365 days) drive compliance scoring.

Security

Sign a message with a private key or verify a signature with a public key — supports RSA-PSS (SHA-256), ECDSA (P-256), and Ed25519. Pure client-side crypto (Node crypto.createSign/createVerify), no network. Paste a PEM key to sign or to verify a base64 signature. This tool signs/verifies; it does not generate key pairs.

Security

Measure the randomness of any data — Shannon entropy (bits/symbol), Min-Entropy (worst-case guess work), alphabet size, duplicate rate, and an average brute-force cracking time at a chosen hash rate. Rates data as Strong (≥128-bit min-entropy), Medium (64-127), or Weak (<64).

Validation

Validate 8-digit EAN-8 / GTIN-8 product barcodes with check-digit verification, GS1 country prefix and packaging breakdown.

Security

Generate Ed25519 or X25519 keypairs from random or deterministic seed text, then sign or verify messages

Validation

Validate US Employer Identification Numbers