Developer Tools
20 ToolsFree, accurate, and instant online tools and calculators for developer tools. Run directly in your browser with zero configuration.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) to view the header, payload, and signature without needing a secret key.
Regex Tester
Test and debug regular expressions against sample text in real time, with match highlighting and group capture details.
UUID Generator
Generate RFC-compliant UUIDs (v1, v4) in bulk. Copy individual or multiple UUIDs with a single click.
Cron Expression Generator
Build and validate cron expressions visually. Instantly see the next scheduled run times for any cron schedule.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes from any text or file input instantly.
Color Code Converter
Convert color codes between HEX, RGB, HSL, HSV, and CMYK formats with a visual color picker.
CSS Gradient Generator
Create beautiful linear, radial, and conic CSS gradients visually and copy the generated CSS code.
QR Code Generator
Generate QR codes for URLs, text, Wi-Fi credentials, vCards, and more. Download as PNG or SVG.
Password Generator
Generate strong, secure passwords with custom length, character sets, symbols, and numbers. Includes strength indicator.
SQL Query Formatter
Format and indent complex SQL queries for improved readability. Supports MySQL, PostgreSQL, and standard SQL dialects.
HTTP Status Code Lookup
Look up any HTTP status code to get its official name, description, and usage guidelines.
MIME Type Lookup
Look up MIME types by file extension or search by MIME type to find associated file extensions.
IP Address Information Tool
Look up geolocation, ISP, and network details for any IP address (IPv4 or IPv6). Also detects your current IP.
User-Agent Parser
Parse any User-Agent string to identify the browser, operating system, device type, and engine details.
HTML to Markdown Converter
Convert HTML markup to clean Markdown syntax, preserving headings, lists, links, tables, and inline formatting.
JSON to CSV Converter
Convert JSON arrays to CSV format and download the resulting file for use in spreadsheets or data tools.
CSV to JSON Converter
Convert CSV data to JSON format with automatic header detection and optional nested object output.
JSON Schema Validator
Validate JSON data against a JSON Schema (Draft-07 or later) and get detailed error messages for invalid fields.
SVG Optimizer
Optimize and minify SVG files by removing unnecessary metadata, comments, and redundant elements to reduce file size.
API Request Builder
Build and send HTTP requests (GET, POST, PUT, DELETE) with custom headers, query params, and body. View formatted responses.