Free Online Developer Tools
Format JSON, decode JWTs, generate UUIDs, test regex, and more — all running instantly in your browser. Your data never leaves your device.
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Most popular tools on DevToolkit
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Browse our complete collection of free developer utilities
20+
Developer Tools
100%
Private & Secure
0ms
Server Latency
Free
Forever
Developer's Toolkit that is designed for both Performance & Privacy
DevToolkit — a free collection of online developer tools for modern web development workflows. Whether it is formatting JSON or decoding a JWT token, generating UUIDs or testing regular expressions — everything is at your disposal instantly without any setup.
DevToolkit works completely different from all of the online tools. While traditional online tools transfer your data to remote backend servers, every single tool on DevToolkit runs locally within browser as a pure JavaScript. This ensures your API keys, tokens, passwords, and sensitive data remain on your machine. It is quicker, more secure and works offline after the first page load.
Whether you're a frontend developer trying to debug API responses, a backend engineer validating JSON configs, or maybe just a DevOps professional restricting out the cron schedules, DevToolkit has the tools you need, completely free with no account required.
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Frequently Asked Questions
Are DevToolkit developer tools actually FREE?+
Yes, you can use all 20+ tools on DevToolkit for free, with unlimited usage without signup and any hidden fees. Our Vision is that all developer utilities should be available for everyone!
Can I trust using these tools with my data?+
Absolutely. All the tools run entirely in your browser using JavaScript. None of your input data is sent to our servers or to third parties. This makes DevToolkit safe for sensitive data like API keys, JWT tokens, and passwords.
Do I need to create an account?+
No account is needed. Simply choose any tool page, and you can start using it. Your preference for a theme and an ordinary list of recently used tools are stored in the local storage of your browser.
What tools are available on DevToolkit?+
DevToolkit offers 20 developer tools including JSON Formatter, JSON Validator, JWT Decoder, Base64 Encoder, URL Encoder, UUID Generator, Unix Timestamp Converter, Regex Tester, Password Generator, Hash Generator, SQL/HTML/CSS/JS Formatters, Cron Generator, Color Converter, Lorem Ipsum Generator, Text Diff Checker, Case Converter, and QR Code Generator.
Can I use DevToolkit on mobile?+
DevToolkit is responsive, and works on phones, tablets, and desktops — YES. Every tool is designed for touch and small screens.
How is DevToolkit different from other developer tool websites?+
DevToolkit cares about privacy (everything is done on the client-side,), no server round-trips, and simplicity (no ads disrupting your workflow till you decide). All tools loads fast, and all works offline as soon as the page gets cached.
Developer Guides & Tutorials
Learn JSON, JWT, Base64, and more with our free guides. Step-by-step tutorials that link directly to the tools you need.
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