Developer tools in your browser
Everything runs locally. No uploads. Fast tools for daily dev tasks.
No sign-up. No uploads. No tracking by default.
What is Dev Tools Essentials
Offline - privacy-first - fast
Dev Tools Essentials is a collection of practical, browser-based utilities for everyday developer tasks.
Tools run locally in your browser using client-side JavaScript - your data is not uploaded to servers.
Use it for API debugging, token decoding, config editing, text cleanup, and quick conversions between formats.
- JSON, XML, YAML formatting and conversion
- Base64 and JWT decoding for debugging
- Regex testing, diff, counters, and small helpers
Recent
Last opened tools
About
Service Overview
Developer Tools Essentials provides a set of lightweight, browser-based tools for developers who value speed, privacy, and simplicity.
Everything runs locally in your browser, making it safe to work with confidential data without uploads or external services.
FAQ
Common questions
Do you upload or store my data?
No. Tools run locally in your browser. Input is processed on
your device.
Do these tools work offline?
Yes. Once a page is loaded, it can work offline (browser
caching).
What does Privacy mode do?
It disables local history and popularity counters stored in
your browser.
Is this free to use?
Yes. The tools are free to use in the browser.