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Formatters

JSON Formatter
XML Formatter
YAML Formatter
SQL Formatter
HTML Formatter

Encoders/Decoders

Base64 Encoder / Decoder
URL Encoder / Decoder
JWT Decoder
HTML Entities Encoder / Decoder

Generators

UUID Generator
Password Generator
Hash Generator
Lorem Ipsum Generator
Test Data Generator

String Tools

Regex Tester
Diff Checker
Case Converter
String Escape / Unescape
Word & Character Counter

API Tools

cURL Builder
REST API Tester
Postman → cURL Converter

Date/Time

Timestamp Converter
Cron Expression Parser
Date Diff Calculator

Number/Color

Base Converter
Color Converter

Validators

JSON Schema Validator
Email Validator
URL Validator
Credit Card Validator

QA-Specific

Test Case Template Generator
Bug Report Template
Defect Metrics Calculator

Security

XSS Payload Library
SQL Injection Payload Library
OWASP Top 10 Checklist

HomeValidatorsCredit Card Validator

Credit Card Validator

Validate card numbers via Luhn algorithm.

Card number

Test card numbers

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