Privacy Policy

Last updated: 2026-11-11

MyDevToolbox (“we”, “the site”), available at mydevtoolbox.dev, offers free developer tools. We designed it to collect as little data as possible. This policy explains exactly what happens to the information you enter, what is stored on your device and which third parties are involved.

1. Tools that run entirely in your browser

The following tools process everything locally with JavaScript. The text, files, tokens and keys you enter are never sent to our servers:

2. Tools that use our server

Some tasks need native libraries or network access that a browser does not provide. For these tools, your input is sent to our server over an encrypted HTTPS connection, processed in memory to produce the result and discarded immediately. We do not store, log or share the content you submit, and API responses are marked as non-cacheable:

Hybrid tools work in both ways:

Universal Converter – parsing and conversion happen on our server; the interface runs in your browser.
Regex Tester – the JavaScript engine runs in your browser; the Python and PCRE2 engines run on our server.

The DNS Lookup tool sends the domain name you query to the public resolver you select (Cloudflare, Google or Quad9), which processes it under its own privacy policy. Even though we never store submitted content, avoid entering real production passwords or private keys into any online tool.

3. Data stored on your device (localStorage)

To save you from re-typing, the site can use your browser's localStorage – only if you allow the “Preferences” category in the privacy banner. This is purely local storage: it stays on your device, is never transmitted to us and is not a cookie. Entries are prefixed with mdt: and contain:

The last input and options of each tool (for example, the selected algorithm or indentation).
Interface preferences, such as whether the sidebar is collapsed.

Passwords, passphrases, signing secrets and generated private keys are never written to localStorage. You can delete a tool's stored data at any time with its Clear Data button, or remove everything by clearing your browser's site data. Withdrawing the “Preferences” consent deletes all of it automatically. The only entry stored regardless of your choice is mdt:consent, which remembers the choice itself.

4. Server logs and abuse prevention

Like any website, our web server records standard technical access logs: IP address, date and time, requested URL path, HTTP status and browser user agent. These logs never contain the content you submit to the tools, are used only for security and troubleshooting, and are deleted after a short retention period. To prevent abuse, the API keeps a temporary in-memory counter of requests per IP address, which expires after one minute.

5. Cookies and your consent

MyDevToolbox itself does not set cookies. We currently use no analytics or advertising services, so no third-party cookies are set either.

6. Your rights

Because we do not keep the content you submit or create user accounts, we generally hold no personal data that could be linked to you beyond short-lived server logs. Depending on where you live (for example under the GDPR in the European Union or the CCPA in California), you may have the right to access, correct or delete personal data and to object to its processing. To exercise these rights, write to johnprojectsnet@gmail.com.

7. Children

The site is intended for developers and is not directed at children under 16. We do not knowingly collect their data.

8. Changes to this policy

If our practices change – for example when adding a new tool or service – we will update this page and its “last updated” date. Material changes will be highlighted on the site.

9. Contact

Questions about privacy? Contact us at johnprojectsnet@gmail.com.