Everything runs in your browser
Every calculator on Toolbit — subnet, VLSM, base converter, password generator, cron parser, JSON formatter — processes your input locally, using JavaScript that runs on your own device. There is no backend endpoint that receives what you type into a tool: the site is built as a statically rendered Next.js app with no API route collecting form inputs. The IP address you calculate a subnet for, the JSON you paste to format, the password you generate — none of it ever leaves your browser.
What is actually collected
Two third-party services are used around the tools themselves, and they do collect some data about your visit:
- Google Analytics measures which pages get visited and how people find the site (a search engine, a direct link, an ad campaign). It only loads when a measurement ID is configured — if it isn't, the script is never injected into the page at all. What it sees is aggregate, anonymized traffic data: page views, referrers, rough device type.
- Google AdSense serves ads to help keep the tools free to use. AdSense can set its own cookies and third-party cookies to serve relevant ads and measure their performance, under Google's advertising policies.
Neither service has any visibility into what you type into a calculator — that data simply never reaches them.
Cookies
Depending on which of the above services are active, this site may set the following categories of cookies:
| Category | Set by | Purpose |
|---|---|---|
| Analytics | Google Analytics | Measuring aggregate site traffic |
| Advertising | Google AdSense | Serving and measuring ads |
| Preferences | This site | Remembering your theme (light/dark) and language choice |
Preference cookies are stored via localStorage in your own browser, are never transmitted anywhere, and can be cleared at any time from your browser settings.
Opting out
None of the tools require Analytics or AdSense to function, so you can disable either without losing anything:
- Block third-party cookies in your browser's privacy settings.
- Install the Google Analytics opt-out browser add-on.
- Manage ad personalization at adssettings.google.com.
- Use an ad or tracker blocker.
Links to other sites
The footer links out to the developer's Instagram profile. That's an external service governed by its own privacy policy, unrelated to this one.
Children's privacy
Toolbit is not directed at children under 13 and does not knowingly collect personal data from them.
Questions or changes
Reach out through the contact page with any privacy question. This policy is updated whenever the set of third-party services in use changes; the project's public repository history reflects when that last happened.