Free Developer Tools Online
Free online developer tools: JSON formatter, hash generator, Markdown preview, regex tester, and more. Essential utilities for every developer.
JSON Formatter
JSON formatter and validator online - format, beautify, and validate JSON data instantly in your browser
Hash Generator
Free online hash generator - generate MD5, SHA-1, SHA-256 hashes from any input text
Markdown Preview
Free online markdown preview - write Markdown and see a live rendered preview side by side
Regex Tester
Free online regex tester - test and debug regular expressions with live matching and highlights
Regex Playground
Free online regex playground - build, test, and debug regular expressions with real-time match highlighting
Text Diff Checker
Free online text diff checker - compare two texts and see the differences highlighted line by line
JWT Decoder
Free online JWT decoder - decode and inspect JSON Web Tokens without sending them to a server
Cron Expression Parser
Free online cron expression parser - parse cron expressions and see the next scheduled run times
Crontab Generator
Free online crontab generator - build cron expressions visually with an intuitive interface
Markdown Table Generator
Free online markdown table generator - create Markdown tables visually with an interactive editor
Chmod Calculator
Free online chmod calculator - calculate Unix file permissions with an interactive chmod builder
JSON to TypeScript
Free online JSON to typescript - convert JSON objects to TypeScript interfaces and type definitions
SQL Formatter
Free online sql formatter - format and beautify SQL queries with proper indentation and syntax highlighting
XML Formatter
Free online XML formatter - format, validate, and beautify XML data with proper indentation
CSV Viewer
Free online CSV viewer - view, sort, and filter CSV data in an interactive table format
IP Subnet Calculator
Free online IP subnet calculator - calculate IP subnet details, CIDR notation, and network address ranges
Code Formatter
Free online code formatter - beautify and format JavaScript, CSS, HTML, and more
AES Encryption Tool
Free online AES encryption tool - encrypt and decrypt text using AES-256 encryption
HTTP Request Builder
Free online HTTP request builder - build and test HTTP requests with custom headers and body
CSS Formatter
Free online CSS formatter - format and beautify CSS code with configurable options
htaccess Generator
Free online htaccess generator - generate Apache .htaccess redirect and rewrite rules
XML Sitemap Generator
Free online XML sitemap generator - generate XML sitemaps from a list of URLs
Browser Feature Support
Free online browser feature support - check CSS and HTML feature browser compatibility
Code Screenshot
Free online code screenshot - create beautiful code screenshots with syntax highlighting
JSON Schema Generator
Free online JSON schema generator - generate JSON Schema from sample JSON data automatically
Git Commit Message Generator
Free online git commit message generator - generate conventional commit messages with type, scope, and description
Explain This
Free online explain this - paste any input and get a human-readable explanation of what it is
JSON Path Finder
Free online JSON path finder - navigate JSON and click to copy the path to any value
NPM Package Explorer
Free online NPM package explorer - search npm packages, check bundle sizes, and generate CDN links
AI Regex Generator
Free online AI regex generator - browse 35+ common regex patterns or generate custom ones with AI
AI Chat
Chat with a local AI that runs entirely in your browser - private, fast, no data leaves your device
AI Code Explainer
Paste any code and get a clear explanation from a local AI - your code never leaves your browser
AI Commit Message Generator
Generate git commit messages from diffs or change descriptions using a local AI in your browser
AI Code Converter
Convert code between programming languages using a local AI - your code never leaves your browser
AI Documentation Generator
Generate documentation comments for your code using a local AI - nothing leaves your browser
AI Regex Explainer
Get plain English explanations of regex patterns using a local AI - with live match testing
AI Bug Spotter
Paste code and find potential bugs, security issues, and improvements using a local AI
GitHub README Generator
Free online github readme generator - create stunning GitHub profile READMEs with badges and stats
GitHub Repo Stats
Free online github repo stats - view repository statistics, badges, and activity charts
GitHub Actions Generator
Free online github actions generator - generate CI/CD workflow YAML files from templates
Webhook Tester
Webhook tester online - generate temporary webhook URLs and inspect incoming HTTP requests for free
.gitignore Generator
Generate .gitignore files for any project - 50+ templates for languages, frameworks, IDEs, and OS
Dockerfile Generator
Generate production-ready Dockerfiles for 18 stacks - multi-stage builds, best practices included
Bitwise Calculator
Bitwise operations calculator - AND, OR, XOR, NOT, shifts with interactive bit grid visualization
Hex Dump Viewer
View hex dumps of files and text online - color-coded bytes, search, and ASCII representation
.env Editor & Validator
Edit and validate .env files online - detect duplicates, mask secrets, generate .env.example
package.json Generator
Generate package.json files with a form-based builder - 8 project presets, all fields supported
Changelog Generator
Generate changelogs in Keep a Changelog format - version entries, semver, and diff links
About Developer Tools
All developer tools on ToolBox are completely free and run entirely in your browser. Your data never leaves your device - there are no server uploads, no accounts required, and no usage limits. Whether you're a developer, designer, student, or professional, these tools are built to save you time.