Free online tools for developers. No login, no ads, no nonsense.
DevToolbox started with a simple problem. Every time I needed a quick tool — a JSON formatter, a Base64 encoder, a regex tester — I ended up on a slow site covered in ads that barely worked on mobile. So I built a cleaner version.
Every tool on this site runs entirely in your browser. Nothing is uploaded to any server. Nothing is tracked. No account needed. You open a tool, use it, and get on with your work.
The tools cover common developer tasks — formatting and validating data, encoding and decoding, generating unique IDs, testing regular expressions, calculating hashes, working with CSS, and more. New tools are added regularly.
Every tool is a single HTML file with vanilla JavaScript. No frameworks, no build tools, no dependencies except for a couple of well-tested libraries for specific tasks like QR code generation and YAML parsing. The whole site is hosted on GitHub Pages for free.
Because everything runs in the browser there is no server to maintain, no database to secure, and no API keys to manage. It is as simple as it can be while still doing something useful.
No data you enter into any tool is ever sent anywhere. JSON, passwords, code, text — it all stays in your browser tab. When you close the tab it is gone. The only exception is the Markdown Editor which saves your draft to your browser's local storage so you do not lose your work between sessions. Nothing leaves your device.
For full details see the Privacy Policy.
This site was built by Aftab Khan, a senior .NET and full-stack engineer based in Doha. I build open source tools, write about backend engineering on Dev.to, and publish packages on NuGet.
If you find a bug or have a suggestion for a new tool, open an issue on GitHub.