Free Online Developer Tools
Built for Speed & Privacy
Essential coding utilities for developers: format JSON, encode Base64, generate UUIDs, and convert between formats. All tools run locally in your browser—your data never leaves your device.
Professional Developer Tools for Modern Web Development
DevTools Hub provides a comprehensive suite of free online developer tools designed for web developers, software engineers, and DevOps professionals. Whether you need to format JSON data, encode files to Base64, generate secure passwords, or convert between different data formats, our tools handle it all with speed and precision.
All our coding tools run entirely in your browser, ensuring complete privacy and security. Your data is never sent to any server, making these tools perfect for working with sensitive information. Access professional-grade formatters, converters, generators, and validators without creating an account or paying subscription fees.
JSON Formatter
Validate, beautify, and repair invalid JSON. Convert JSON to CSV or TypeScript interfaces instantly.
SQL Formatter
Format and prettify SQL queries for any dialect. Convert raw SQL to Java, Python, or JS strings.
HTML Formatter
Beautify or minify HTML. Convert legacy markup to React JSX components with a live preview.
CSS Minifier
Compress CSS for production, beautify messy code, or convert styles to JSON objects for React Native.
JS Formatter
Format and minify JavaScript. Convert loose JS objects to strict JSON for APIs.
XML Formatter
Format, minify, and validate XML. Convert XML structures to JSON and vice-versa seamlessly.
Markdown Editor
Live Markdown editor with preview. Convert Markdown to HTML or HTML back to Markdown.
JSON ↔ CSV
Convert JSON to CSV for Excel and back. Smart flattening for nested objects included.
YAML ↔ JSON
Convert between YAML and JSON. Perfect for Kubernetes, Docker, and API configurations.
Base64 Encoder
Encode text, files, and images to Base64 strings. Decode Base64 back to original format.
URL Encoder
Encode/Decode URLs and parse complex query strings into a readable table.
Timestamp Tool
Convert Unix Epoch timestamps to human-readable dates. Supports seconds and milliseconds.
Color Converter
Convert HEX, RGB, HSL, and CMYK. Generate palettes and check accessibility contrast.
Case Converter
Convert text case instantly: camelCase, snake_case, PascalCase, Kebab-Case, and more.
Password Generator
Generate cryptographically secure passwords or memorable passphrases locally.
UUID Generator
Generate random UUIDs (v4) or time-sortable UUIDs (v7) in bulk for databases.
Hash Generator
Calculate MD5, SHA-256, and SHA-512 hashes for text or files. Verify file checksums.
JWT Decoder
Decode JSON Web Tokens (JWT), inspect claims, and verify signatures with your secret.
QR Code Generator
Create custom QR codes for URLs, WiFi, and text. Customize colors and add logos.
Lorem Ipsum
Generate placeholder text with HTML/JSON formatting. Choose from standard or fun themes.
Cron Generator
Build cron schedules visually. Supports standard Crontab and AWS/Quartz formats.
Word Counter
Count words and characters. Analyze reading time, keyword density, and readability.
User Agent Parser
Identify browser, OS, and device from User Agent strings. Detect bots and crawlers.
More tools arriving soon...
Why Choose DevTools Hub?
Privacy-First Architecture
Unlike other online tools, all processing happens in your browser. No data is transmitted to our servers, making it safe to work with API keys, tokens, and sensitive code.
Lightning-Fast Performance
Zero server round-trips mean instant results. Our tools are optimized for speed, handling large files and complex operations smoothly.
No Registration Required
Jump straight into formatting, converting, or generating without creating an account. Bookmark your favorite tools for quick access.
Regular Updates
We continuously add new tools and features based on developer feedback. Our suite grows with the needs of the development community.
Popular Developer Tools
Our most-used tools include the JSON Formatter for validating and beautifying JSON data, the Base64 Encoder for encoding images and files, the UUID Generator for creating unique identifiers, and the SQL Formatter for cleaning up database queries. Each tool is designed with a clean interface and powerful features to boost your productivity.