Validation
Validate date and time formats including ISO8601, custom formats, leap year, and month/day validation
date-time-validatorSecurity
Parse an X.509 SSL/TLS certificate (paste PEM or upload .pem/.crt) and inspect subject, issuer, validity period with expiry status, public key, signature algorithm, serial, SANs, key usage and fingerprint. Like openssl x509 -text, visualised. Runs locally.
certificate-decoderSecurity
Compute the CRC32 checksum (IEEE 802.3 polynomial) of any text or raw bytes. Output as hex, decimal or binary. Accepts plain text (UTF-8) or raw bytes via hex/base64 input.
crc32-checksumValidation
Validate 9-character CUSIP North American securities identifiers with mod-10 check-digit verification, issuer base and issue-number breakdown.
cusip-validatorSecurity
Generate Argon2id password hashes with tunable memory, iterations, parallelism, salt length, and PHC output
argon2-password-hash-generatorSecurity
Inject visible or signature-style watermark fields into CSV or JSON exports so shared datasets can be traced later
csv-json-data-watermarkerValidation
Validate ISO 4217 currency codes
currency-validatorValidation
Validate Hex (#FFF, #RRGGBB), RGB/RGBA, HSL/HSLA color code syntax
color-code-validatorValidation
Validate Linux Crontab定时任务表达式（分 时 日 月 周）syntax
cron-expression-validatorValidation
Validate credit card numbers and identify card type (Visa, MasterCard, UnionPay, etc.)
credit-card-validatorSecurity
Encrypt or decrypt portable password-based file bundles with Argon2id, XChaCha20-Poly1305, and optional signatures
age-like-encrypted-file-bundleSecurity
Compare two AGEX bundles and highlight metadata or protection-setting differences
agex-bundle-diff