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About DevToolbox

DevToolbox is a collection of utilities for the short lookups and conversions that interrupt development work. It currently offers 62 tools across 8 categories, with no installation and no sign-up.

Why it exists

Formatting a JSON response, decoding a Base64 string found in a log, checking when a cron expression will next fire — these interruptions happen several times a day. The sites that come up in search often bury the tool under advertising, send your input to a server for processing, or ask you to sign up before using a single feature.

DevToolbox aims for the opposite: one tool per page, input and output visible immediately, and processing that keeps your input inside the browser. Tools are searchable from the sidebar (⌘K), and the layout stays consistent as you move between pages.

How the tools work

  • Every conversion, hash, formatting, and generation feature runs in browser JavaScript. Your input is not sent to the server.
  • There is no database of user data. There are no accounts, and no usage history is kept by the site.
  • Results update as you type. There is no separate run button to press.
  • Korean and English are supported, with a dark and light theme toggle.

What is included

How it is funded

The site is run by an individual and all tools are free. Server and domain costs are covered by the advertising shown on the pages. Ads are placed only where they do not interfere with using a tool, and never over the input or output areas.

The third-party services that set cookies for advertising are described in detail in the privacy policy.

How it is built

Built with PHP, plain JavaScript, and jQuery, without a frontend framework. Each tool page works independently, so a problem in one tool does not affect the others. Hash functions use crypto-js.

Feedback and requests

If a tool you need is missing, or a result looks wrong, let us know and it will be considered. Requests for new tools, bug reports, and translation improvements are all welcome.
Email: contact@devtools.co.kr

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