Dev Toolbox
Free developer tools
A fast, no-nonsense toolbox for everyday development tasks. Format JSON and HTML, test regular expressions, generate UUIDs, convert timestamps, pick colors, generate QR codes, and more.
Every tool runs entirely in your browser, so your code and data stay local and results appear instantly. There is nothing to install — bookmark the ones you use most and they work even offline once loaded.
All Dev Toolbox tools
JSON Formatter
Format and validate JSON
HTML Formatter
Format HTML code
Regex Tester
Test regular expressions
Lorem Ipsum Generator
Generate dummy text
Color Picker & Palette
Pick and save colors
QR Code Generator
Generate QR codes
Markdown Editor
Edit and preview Markdown with live HTML output
Code Beautifier
Format JavaScript, CSS, SQL code
UUID Generator
Generate UUIDs and GUIDs
Text Diff Checker
Compare two text blocks side-by-side
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Frequently asked questions
- Do these developer tools work offline?
- Yes. Once the page has loaded, each tool runs fully in your browser and keeps working without an internet connection.
- Is my code or data sent to a server?
- No. Everything is processed locally in your browser, so your input never leaves your device.
- Are the developer tools free?
- Yes. All developer tools are free with no sign-up, no limits, and no ads injected into your output.
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Privacy Center
Encrypt, hash, and encode without sending data anywhere.
Study Desk
Summaries, paraphrasing, reading time, and word analytics.
Smart Calculators
BMI, EMI, calories, units, and all the everyday math essentials.