Free Developer Tools Online
62 free tools — no signup required
Essential utilities for web developers and programmers. Format and minify JSON, CSS, JavaScript, and SQL. Convert between data formats like CSV, XML, YAML, and JSON. Generate meta tags, regex patterns, and code boilerplate. Validate and debug JWTs, cron expressions, and user agents.
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
URL Encoder/Decoder
Encode or decode URL components for safe use in web addresses.
HTML Entity Encoder/Decoder
Encode special characters to HTML entities or decode them back.
Regex Tester
Test regular expressions with real-time matching and group highlighting.
CSS Minifier
Minify CSS code by removing whitespace, comments, and unnecessary characters.
JavaScript Minifier
Minify JavaScript code to reduce file size.
HTML Prettifier
Format and indent HTML code for better readability.
SQL Formatter
Format and beautify SQL queries with proper indentation.
Markdown Preview
Write Markdown and see the rendered preview in real-time.
Cron Expression Parser
Parse and explain cron expressions in human-readable format.
JWT Decoder
Decode and inspect JSON Web Tokens without verification.
CSS Gradient Generator
Create beautiful CSS gradients with a visual editor.
Box Shadow Generator
Design CSS box shadows with a visual editor and get the code.
Meta Tag Generator
Generate HTML meta tags for SEO, social sharing, and more.
Chmod Calculator
Calculate Unix file permissions in numeric and symbolic notation.
CSV to JSON
Convert CSV data to JSON format and vice versa.
XML to JSON
Convert XML data to JSON format.
YAML to JSON
Convert between YAML and JSON formats.
User Agent Parser
Parse and analyze browser user agent strings.
HTML Minifier
Minify HTML code by removing whitespace, comments, and redundant attributes.
JSON to CSV
Convert JSON arrays to CSV format for spreadsheets and data analysis.
JSON to XML
Convert JSON data to XML format with customizable options.
JSON to YAML
Convert JSON data to YAML format for configuration files.
CSS Formatter
Format and beautify minified CSS code with proper indentation.
JavaScript Formatter
Format and beautify minified JavaScript code.
JSON Validator
Validate JSON syntax with detailed error messages and line numbers.
Code Diff Checker
Compare two code files side-by-side with syntax-aware highlighting.
Color Picker
Pick colors from a visual palette and get HEX, RGB, and HSL values.
URL Parser
Parse URLs into their component parts: protocol, host, path, query, and fragment.
Markdown Table Generator
Create markdown tables with a visual editor and copy the code.
SVG Optimizer
Optimize SVG files by removing unnecessary metadata and simplifying paths.
TypeScript to JSON Schema
Convert TypeScript interfaces to JSON Schema definitions.
API Request Tester
Send HTTP requests and inspect responses. Supports GET, POST, PUT, DELETE.
Programmer's Calculator
Convert between binary, octal, decimal, and hexadecimal with bitwise operations.
XML Formatter
Format, prettify, and minify XML code with syntax validation.
TOML to JSON Converter
Convert TOML configuration files to JSON format.
JSONPath Tester
Test JSONPath expressions against JSON data and see results instantly.
GraphQL Formatter
Format and prettify GraphQL queries, mutations, and schema definitions.
Dockerfile Generator
Generate Dockerfiles for Node.js, Python, Go, Java, and Nginx.
.gitignore Generator
Generate .gitignore files for common languages and frameworks.
Nginx Config Generator
Generate Nginx server block configurations with SSL and proxy settings.
IP Subnet Calculator
Calculate network address, broadcast, hosts, and subnet mask from CIDR notation.
ASCII Art Generator
Convert text to ASCII art in banner and block styles.
Code Lorem Ipsum Generator
Generate placeholder code snippets in JSON, SQL, HTML, JS, TypeScript, and CSS.
Hash Identifier
Identify the type of a hash string from its pattern and length.
JWT Generator
Generate JSON Web Tokens with custom headers and payload claims.
cURL to Code Converter
Convert cURL commands to JavaScript Fetch or Python Requests code.
CSS Animation Generator
Create CSS keyframe animations with timing, duration, and preset controls.
Border Radius Generator
Visually edit CSS border-radius values with a live preview.
CSS Flexbox Generator
Visual CSS flexbox playground with live preview and code output.
CSS Grid Generator
Visual CSS Grid layout builder with live preview and code output.
Text to Handlebars Template
Convert plain text to Handlebars template variables.
JSON Diff
Compare two JSON objects and highlight added, removed, and changed keys.
.env File Generator
Generate .env file templates for Node.js, databases, JWT, Redis, email, and AWS.
CORS Tester
Test CORS headers on any URL and see what the server returns.
HTTP Status Code Reference
Look up HTTP status codes with descriptions, categories, and use cases.
MIME Type Lookup
Look up MIME types by file extension for web and API development.
Escape / Unescape Tool
Escape and unescape strings for URL, HTML, JSON, Base64, and RegEx.
Timestamp Generator
Generate timestamps in Unix, ISO 8601, UTC, and other formats.
Binary to Text Converter
Convert binary code to readable text and text to binary.
Pixel Density Calculator (PPI)
Calculate pixels per inch (PPI) from screen resolution and size.