43+ tools · No signup · Most tools run locally in your browser
Test HTTP APIs with custom headers and body — GET, POST, PUT, DELETE and more
Compress images in your browser — JPEG, PNG, WebP with adjustable quality
Beautify, validate, and minify JSON data
Encode text to Base64 or decode Base64 to text
Merge multiple PDF files into one document
Convert PDF pages to PNG or JPEG images
Convert multiple images to a single PDF document
Free online calculators: BMI, mortgage, percentage, date and more
Calculate your Body Mass Index and check your health status
Calculate monthly mortgage payments and total interest
Calculate percentages, increases, decreases and ratios
Calculate date differences, add/subtract days and find days until
Encode or decode URLs and query parameters
Generate secure random passwords
Generate UUID v4 identifiers
Convert between HEX, RGB, and HSL color formats
Decode and inspect JSON Web Tokens
Convert Unix timestamps to human-readable dates
Test and debug regular expressions with live matching
Preview Markdown with live rendering
Build and explain cron schedule expressions
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes
Generate placeholder text for designs and mockups
Convert between binary, octal, decimal, and hex
Encode special characters to HTML entities or decode HTML entities back to text
Compare two texts and highlight differences
Convert JSON arrays to CSV format with automatic key detection
Count words, characters, sentences, and paragraphs in your text
Format and beautify JavaScript, HTML, CSS, JSON, and SQL code
Generate QR codes from text or URLs
Convert images to Base64 encoded strings
Minify and compress CSS code to reduce file size
Convert HTML content to clean Markdown format
Format and beautify SQL queries with proper indentation
Calculate Linux file permissions from symbolic or numeric notation
Convert text between uppercase, lowercase, title case, and more
Optimize and compress SVG files by removing unnecessary data
Find and extract values from JSON using path expressions
Parse and analyze URL components (protocol, host, path, query params)
Convert HEX color codes to RGB and vice versa
Convert CSV data to JSON format with automatic header detection
Convert Unix timestamps to human-readable dates and vice versa
Look up your public IP address and basic geolocation info
Convert SVG to PNG, JPEG, or WebP format with customizable size and quality
DevBox is a comprehensive collection of free online developer tools designed to streamline your workflow and boost productivity. Whether you are a seasoned software engineer, a web developer, or just starting your coding journey, our platform provides instant access to 43+ essential utilities, most of which run entirely in your browser. From formatting JSON and encoding Base64 to generating secure passwords and testing regular expressions, every tool is crafted with precision and ease of use in mind.
Unlike many other tool platforms, DevBox requires no registration, no downloads, and no installation. Simply visit the website, select the tool you need, and start working immediately. Most processing happens client-side in your browser. A few tools that require network access (such as API Tester and IP Lookup) are clearly marked with their own data handling details. This privacy-first approach makes DevBox ideal for handling confidential code snippets, API keys, or proprietary data.
DevBox organizes tools into six intuitive categories to help you find exactly what you need:
Beautify and validate your code with JSON Formatter, SQL Formatter, HTML to Markdown converter, and more. Ensure your code follows best practices and is easy to read.
Handle data encoding with Base64, URL Encoder/Decoder, HTML Entity Encoder, and Hex to RGB converter. Essential for web development and data processing tasks.
Create secure passwords, UUIDs, QR codes, Cron expressions, and Lorem Ipsum text. Save time on repetitive generation tasks.
Convert between formats, calculate file permissions with Chmod Calculator, find JSON paths, and perform various utility operations.
Using DevBox is straightforward: browse the tool grid or use the search shortcut (press / to focus the search box), click on your desired tool, and start working. Each tool page includes detailed instructions, usage examples, and frequently asked questions to help you get the most out of the utility.
DevBox was created with a simple mission: to provide developers with reliable, fast, and secure tools that make everyday tasks easier. We are constantly expanding our toolkit based on user feedback and emerging development needs. Our commitment to quality means every tool is thoroughly tested and optimized for performance. Whether you are debugging code, preparing data for APIs, or simply need a quick conversion, DevBox is here to help you work smarter, not harder.