DevTools One
Free online developer utilities to streamline your workflow
Essential Web Development Tools in One Place
DevTools provides free, browser-based utilities for developers, data analysts, and IT professionals. Our tools process everything locally in your browser - no data is sent to servers, ensuring complete privacy and security.
JSON & Code Tools
Format, validate, and compare JSON. Format HTML, CSS, JavaScript, and SQL with syntax highlighting. Fix code formatting issues instantly with our powerful beautifiers.
Try JSON BeautifierEncoders & Converters
Convert data between formats with Base64, URL encoding/decoding, hash generation, and JWT tools. Transform colors between HEX, RGB, and HSL formats effortlessly.
Try Base64 ConverterGenerators & Utilities
Create UUIDs, manage timezone conversions, work with unix timestamps, build cron expressions, and compare text differences without installing any software.
Try UUID GeneratorWhy Choose DevTools for Web Development?
Privacy & Security First
Unlike many online tools, DevTools processes everything directly in your browser. Your data never leaves your computer, making it perfect for sensitive information and compliance requirements.
Works Offline
Once loaded, all tools function without an internet connection. Perfect for developers working in environments with limited connectivity or on-the-go.
Designed for Developers
Our intuitive interface was built by developers for developers, with common tasks and workflows in mind. Save time with our carefully crafted tools that solve real-world development challenges.
Comprehensive Toolset
From data formatting to encoding, conversion, and generation tools, DevTools offers a wide range of utilities for front-end, back-end, and full-stack developers.
Free & Open Source
All tools are completely free to use without limitations. No account registration, no hidden fees, no premium features - just practical developer tools when you need them.
Regular Updates
We continuously improve our tools based on developer feedback, modern web standards, and emerging technology requirements to meet your evolving needs.
Explore All Developer Tools
Access these powerful web development utilities directly in your browser without installation. All tools are free, secure, and built for optimal performance.
Data Formatters
Text Tools
Encoders & Decoders
Converters
Date & Time Tools
Image Tools
Start Using DevTools Today
Join thousands of developers who trust our tools for their daily coding tasks. No registration, no installation, no limits.
JSON Beautifier
Format and prettify messy JSON data with proper indentation and structure. Makes complex JSON data readable and easier to understand.
Input JSON
Formatted JSON
UUID Generator
Generate universally unique identifiers (UUID) for database keys, transaction IDs, or any scenario requiring unique values. Supports multiple formats and batch generation.
Generated UUIDs
URL Encoder/Decoder
Convert special characters in URLs to make them valid for web requests, or decode encoded URLs back to their original form. Essential for working with query parameters and API endpoints.
Input
Result
Base64 Encoder/Decoder
Convert text or files to Base64 format for safe data transmission, or decode Base64 back to its original content. Commonly used for encoding images, binary data, and authentication credentials.
Input
Result
Select a file to convert
Base64 Result
Hash Generator
Generate cryptographic hash values for text or files using MD5, SHA-1, SHA-256, and more. Used for data integrity verification, checksums, and simplified fingerprinting.
Enter Text to Hash
Hash Results
Select File to Hash
Hash Result
JWT Decoder
Decode and verify JSON Web Tokens (JWT) to inspect their headers, payloads, and validate signatures. Helpful for debugging authentication systems and API tokens.
Enter JWT Token
Header
Payload
Signature
Verify Signature
Code Formatter
Beautify and format HTML, XML, CSS, and JavaScript code with consistent indentation and style. Makes code more readable and easier to maintain.
Input Code
Formatted Code
Color Converter
Convert colors between HEX, RGB, RGBA, and HSL formats. Perfect for front-end development, design work, and ensuring color consistency across different coding contexts.
Markdown Preview
Write Markdown and see the formatted HTML output in real-time. Ideal for documentation, README files, and content that will be displayed on GitHub or other Markdown-supporting platforms.
Markdown
Preview
Regular Expression Tester
Build, test, and debug regular expressions with instant matching results and match highlighting. Shows capturing groups and helps refine patterns for text extraction and validation.
Regular Expression
Test String
Results
Enter a pattern and test string to see results
Matches
Capturing Groups
JSON Validator & Compare
Validate JSON syntax for errors and compare two JSON structures to identify differences. Essential for API development, configuration management, and debugging data inconsistencies.
JSON Input
Original JSON
Modified JSON
Differences
Epoch Converter
Convert between Unix timestamps (epoch time) and human-readable dates. Useful for debugging timestamps in logs, databases, and APIs across different time zones.
Current Time
Epoch to Human Date
Human Date to Epoch
Timezone Converter
Convert times between different time zones around the world. Helps coordinate meetings, deployments, and events across global teams and locations.
Enter Date & Time
Conversion Results
Cron Expression Helper
Build and decode cron expressions with an interactive interface. Simplifies scheduling for tasks, jobs, and automated processes with human-readable explanations.
Build Your Cron Expression
Generated Cron Expression
Explanation
Understand a Cron Expression
Expression Meaning
Expression Breakdown
| Field | Value | Meaning |
|---|
Image Converter
Convert images between different formats (PNG, JPG, WebP, BMP) with quality control and resizing options. Optimize images for web use without external software.
Upload Image
Preview
Diff Checker
Compare two text snippets and highlight the differences between them. Perfect for code reviews, content updates, and identifying changes between versions.
Original Text
Modified Text
Differences
CSS/SCSS Converter
Convert between CSS and SCSS formats with nesting and variable extraction. Simplifies stylesheet modernization and helps transition between different CSS preprocessors.
CSS Input
SCSS Output
About This Tool
This tool helps convert between CSS and SCSS formats. The conversion from CSS to SCSS includes basic nesting and variable extraction, while the conversion from SCSS to CSS is a simplified approximation.
For complete SCSS compilation, consider using a proper SCSS compiler like Sass.
SQL Formatter
Format SQL queries with consistent indentation and capitalization for better readability. Supports multiple SQL dialects including MySQL, PostgreSQL, and SQL Server.
Input SQL
Formatted SQL