Validation & Testing Tools Page
Validate data formats, test regular expressions, and verify various input types.
Contrast Checker
Check the contrast ratio between two colors to ensure accessibility (WCAG AA/AAA) compliance. RGB values to HEX format for CSS and design.
Credit Card Validator
Validate credit card numbers using the Luhn algorithm. Detect card type (Visa, MasterCard, American Express, etc.) and check format integrity.
CSS Validator
Validate CSS stylesheets for syntax errors, deprecated rules, and performance issues. Check for browser compatibility, optimize selectors, and ensure best practices. Perfect for front-end developers and designers.
DNS Lookup Tool
Resolve domain names to IP addresses and fetch DNS records (A, AAAA, MX, TXT, CNAME, etc.). Perfect for network diagnostics, domain analysis, and troubleshooting DNS issues.
Email Validator
Quickly check if an email address is valid. Validates email format, syntax, and provides detailed feedback on common issues.
HTML Validator
Check HTML code for syntax errors and standards compliance. Validate markup structure, detect missing tags, and ensure accessibility standards. Perfect for front-end developers.
HTTP Header Checker
Inspect HTTP headers of a given URL request/response to debug caching, security, and SEO issues. Analyze response headers for performance optimization and security best practices.
IP Address Lookup
Look up detailed information about IP addresses including geolocation, ISP, hostname, and network details. Supports both IPv4 and IPv6 addresses with comprehensive data analysis.
JSON Validator
Validate JSON input for proper structure and syntax. Format, minify, and analyze JSON data. Perfect for debugging API payloads or configuration files.
JWT Decoder
Paste a JWT (JSON Web Token) and decode its header and payload. Useful for developers to inspect JWT contents without verification.
JWT Encoder
Create and encode JSON Web Tokens (JWT) with custom header, payload, and secret key. Perfect for developers testing JWT implementation.
Password Strength Checker
Analyze password strength in real-time based on length, complexity, entropy, and common vulnerabilities. Get detailed feedback to improve password security.
Regex Tester
Test regular expressions with sample text. Find matches, test patterns, and debug regex with real-time results and explanations.
User Input Sanitizer Tester
Test user input strings against XSS, SQL injection, and other vulnerabilities. Validate input sanitization and security measures. Essential for web application security testing.
User-Agent Parser
Parse and analyze User-Agent strings to extract detailed information about browsers, operating systems, devices, and engines. Perfect for web analytics and debugging.