About nanotool.ing
nanotool.ing is a collection of small, focused utilities for developers and technical users. Every tool does one thing well, runs entirely in your browser, and requires no account.
Why these tools?
Most developer tools online come with popups, paywalls, login walls, or vague privacy policies. nanotool.ing exists as a clean alternative: open the page, use the tool, close the tab. Nothing saved, nothing sent.
What we build and why
Each tool starts from a real task a developer faces: decoding a JWT during an API debug session, converting a timestamp from a log file, checking what that cron expression actually does on Fridays. We try to make the output useful enough that you learn something, not just get an answer.
Why do tools run in the browser?
Every tool on nanotool.ing is implemented in client-side JavaScript. Your input — whether it's a JWT, a Base64 string, a hash, or a cron schedule — is processed locally by your browser and never sent to any server. This is a deliberate architectural choice: no server-side processing means no data leaves your device.
Privacy by default
Processing happens in your browser. We do not see your input. We do not store it. We do not log it. We use Matomo for privacy-respecting analytics (no cross-site tracking, no fingerprinting). See the privacy policy for full details.
How are tools tested?
Each tool is tested with automated end-to-end tests using Playwright, covering the most important interactions and edge cases. We also run PHP unit and feature tests for server-side logic. Tests run on every change before deployment.
Bugs, feedback, and feature requests
Found a bug or have an idea for a new tool? Send an email to hello@nanotool.ing. We read everything, even if we can't always reply quickly.