Privacy Policy
Last updated: November 8, 2026
This Privacy Policy explains what information DeveloperKit ("we", "us") collects when you use this website, and how it is used. In short: the data you enter into our tools never leaves your device.
Data You Enter Into Our Tools
All tools on DeveloperKit, including the JSON Formatter, JWT Decoder, and Bcrypt Generator, run entirely in your web browser using JavaScript. The text and files you paste, type, upload, or drop into a tool are processed locally on your device.
- Your data is never sent to our servers or to any third party.
- Your data is never stored, logged, or saved by us.
- Closing or reloading the page removes your data from memory.
- Tokens, passwords, secrets, and keys used for hashing or signature verification are processed with your browser's built-in Web Crypto API and are never transmitted.
Files you upload are read directly by your browser. They are not uploaded anywhere.
Information Collected Automatically
Like most websites, the servers that host DeveloperKit may automatically record standard technical information when your browser requests a page, such as your IP address, browser type, operating system, referring page, and the date and time of the request. This information is used only to operate, secure, and maintain the website.
We do not currently use analytics or tracking tools.
Preferences Stored on Your Device
Some preferences are saved in your browser's local storage so the site remembers them on your next visit:
- Your color theme (light, dark, or system).
- The tools you add to your favorites.
- Your Markdown Editor draft, so your work survives a page reload.
- The list of time zones you compare in the Time Zone Converter.
These preferences stay on your device and are never sent to us. Apart from text you type into the Markdown Editor yourself, they contain no personal information. You can clear them at any time by clearing your browser's site data (the Markdown draft is also removed when you click Clear in the editor).
Advertising and Cookies
We do not currently display advertisements or set cookies. In the future, we may display ads served by Google AdSense to keep our tools free. If we do, the following will apply:
- Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites.
- Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet.
- You may opt out of personalized advertising by visiting Google Ads Settings, or opt out of some third-party vendors' use of cookies by visiting www.aboutads.info.
- Where required by law, for example in the European Economic Area, the United Kingdom, and Switzerland, we will ask for your consent before any advertising cookies are used.
For more information, see how Google uses information from sites that use its services. Advertising partners never have access to the data you enter into our tools.
Children's Privacy
DeveloperKit is not directed at children under 13, and we do not knowingly collect personal information from children.
Your Rights
Because we do not collect or store the data you enter into our tools, there is no personal tool data for us to access, correct, or delete. Depending on where you live, you may have rights over other personal information, such as the right to access or delete it. You can also block or delete cookies at any time in your browser settings.
Changes to This Policy
We may update this Privacy Policy from time to time, for example when we add new features or advertising. Changes take effect when they are posted on this page, and the "Last updated" date above will be revised.