Free Online Developer Tools
Essential free online tools for developers. Use our fast JSON formatters, CSS minifiers, Base64 encoders, UUID generators, and Regex testers directly in your browser. Total privacy, no login required.
Diff Checker
Compare two texts side-by-side to find differences, additions, and deletions.
DNS Lookup
Check worldwide DNS propagation for any domain name.
JWT Decoder
Decode and visualize the content of JWT (JSON Web Token) tokens. Essential tool for developers working with authentication and APIs.
"typ": "JWT"
{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
Hash Calculator
Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) for any text. Essential tool for integrity verification and security.
...204e5603ec2
UUID Generator v4
Generate version 4 Universally Unique Identifiers (UUIDs) in bulk quickly and securely. Ideal for databases, API keys, and object identification.
JSON Formatter & Validator
Format, validate, and minify your JSON code. Free tool for developers to organize messy JSON data.
{"id":101,"status":"success","data":{"user":"admin"}}
{
"id": 101,
"status": "success",
"data": {
"user": "admin"
}
}
Base64 Encoder & Decoder
Convert text to Base64 and vice-versa instantly. Secure tool for encoding sensitive data or binary files.
Regex Builder & Tester
Build and test regular expressions with ready-made templates for Email, URL, and more.
input: "Validar CPF brasileiro"
output: /^\d{3}\.\d{3}\.\d{3}\-\d{2}$/
CSS Minifier
Free online CSS minifier tool. Remove whitespace, comments and unnecessary characters from your CSS to reduce file size and improve page load speed.
HTML Beautifier
Free online HTML formatter and beautifier. Automatically indent and format messy HTML code with customizable indentation for better readability.
URL Encoder/Decoder
Free online URL encoder and decoder. Convert special characters to percent-encoding and back for safe use in URLs, query strings, and API parameters.
Timestamp Converter
Free online Unix timestamp converter. Convert between Unix epoch timestamps and human-readable dates instantly. Supports seconds and milliseconds.