About DevToolCore

A collection of free online developer tools. No accounts, no server uploads, no bullshit.

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What We Build

DevToolCore provides a set of utilities for common development tasks: formatting and validating JSON, testing regular expressions, encoding and decoding Base64 and URL strings, inspecting JWT tokens, generating UUIDs, and converting Unix timestamps. Each tool runs entirely in your browser. Nothing is uploaded to a server, which means your data stays private and the tools work fast.

Why These Tools

Most developers have a folder of bookmarks or a handful of terminal commands for these tasks. We built DevToolCore to consolidate them into one place that loads quickly and gets out of your way. No feature bloat, no pricing tiers, no account walls. Open the page, do your work, close the tab.

How It Works

• All processing happens client-side in JavaScript. No server round-trips, no API keys needed.
• No sign-up or login. The tools are accessible the moment you land on the page.
• No analytics trackers beyond basic traffic counting. We do not track individual users.
• Open source libraries where applicable; credit is given on each tool page.

Contact

Questions, bug reports, or tool requests? Reach out via the Contact page.