Developer Tools
24 free developer tools. Tools for developers.
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JSON Formatter
Format, validate, and minify JSON instantly.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to plain text.
URL Encoder / Decoder
Encode or decode URL components and query strings instantly.
Hash Generator
Generate SHA-1, SHA-256, and SHA-512 hashes from any text.
UUID Generator
Generate random UUID v4 identifiers instantly.
Regex Tester
Test and debug regular expressions with live match highlighting.
JWT Decoder
Decode and inspect JSON Web Token (JWT) headers and payloads.
Cron Expression Helper
Build and understand cron expressions with a visual editor.
Password Generator
Generate secure random passwords with customizable length and character sets. Uses crypto.getRandomValues.
SQL Formatter
Format and beautify SQL queries — supports PostgreSQL, MySQL, SQLite, SQL Server, BigQuery, and standard SQL.
YAML Validator & Formatter
Validate YAML syntax and convert between YAML and JSON. Catches indentation errors and reports line numbers.
XML Formatter & Validator
Format, prettify, and validate XML documents. Configurable indent and minify mode.
Markdown to HTML Converter
Convert Markdown to clean HTML — GitHub-flavored with live preview, copy output, and download options.
HTTP Status Codes Reference
Searchable reference for all HTTP status codes — 1xx informational through 5xx server errors with descriptions.
User Agent Parser
Parse any User-Agent string into browser, OS, engine, and device information.
CSS Gradient Generator
Create beautiful linear and radial CSS gradients with a live preview and copy-ready code.
WCAG Color Contrast Checker
Check color contrast against WCAG 2.1 AA and AAA standards. Verify accessibility for text and UI.
Chmod Calculator
Convert between numeric (755) and symbolic (rwxr-xr-x) Unix file permissions. Click permission bits to build a chmod value.
.gitignore Generator
Generate a .gitignore file for any stack — Node, Python, Java, macOS, VSCode, and more. Pick multiple templates and combine.
cURL Command Builder
Build cURL commands from a form. Pick method, add headers, query params, and JSON body — get a shell-safe command to copy.
JSON ↔ YAML Converter
Convert JSON to YAML and YAML to JSON instantly. Validates input, preserves types, and handles nested structures.
CSS Box Shadow Generator
Visual CSS box-shadow generator with live preview. Adjust offset, blur, spread, color, and inset. Copy production-ready CSS.
Markdown Table Generator
Paste CSV, TSV, or edit cells directly to generate GitHub-flavored markdown tables. Supports column alignment (left/center/right).
CSS Border Radius Generator
Visual CSS border-radius generator. Adjust each corner independently with sliders, preview live, and copy the CSS.