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 run directly in your browser with no account, no signup, and no usage limits. Files and data processed in this category stay in client memory on your device.