🔒 Security & Validation
Validation, privacy, cryptography, and security-focused tools
Cron Expression Validator
Validate Linux Crontab定时任务表达式（分 时 日 月 周）syntax
Security & ValidationISBN Validator
Validate ISBN-10 and ISBN-13 book number formats with checksum verification
Security & ValidationVIN Validator
Validate 17-character Vehicle Identification Number (VIN) format and checksum
Security & ValidationSemVer Validator
Validate Semantic Versioning 2.0.0 version numbers (x.y.z-alpha.1 format)
Security & ValidationCredit Card Validator
Validate credit card numbers and identify card type (Visa, MasterCard, UnionPay, etc.)
Security & ValidationMAC Address Validator
Validate MAC addresses and identify vendor information
Security & ValidationDate & Time Validator
Validate date and time formats including ISO8601, custom formats, leap year, and month/day validation
Security & ValidationIP Address Validator
Validate IPv4 and IPv6 addresses with CIDR notation support
Security & ValidationBatch Phone Validator
Validate and format multiple phone numbers at once with international format support
Security & ValidationBatch Email Validator
Validate multiple email addresses at once with format checking and basic quality analysis
Security & ValidationICCID Validator
Validate ICCID numbers for SIM cards with Luhn checksum and issuer analysis
Security & ValidationIMEI Validator
Validate IMEI numbers for mobile devices using Luhn checksum algorithm
Security & Validation