Privacy is the feature
Your data never leaves your device. We've built an architecture where privacy is a technical guarantee, not just a promise.
The short version
- ✓Tool inputs are never sent to any server; all processing happens locally.
- ✓We store only one preference (theme) in your browser's local storage.
- ✓No tracking cookies or invasive analytics are used.
- ✓Ads come from ethical, privacy-respecting networks only.
1. Who we are
Developer Toolkit (“we”, “our”, “the service”) is a collection of free, browser-based developer utilities available at this website. The service is operated as an independent project.
For privacy questions, contact us at: [email protected]
2. What data we collect and don't collect
Tool inputs and outputs
Every tool on Developer Toolkit runs entirely in your browser using client-side JavaScript. When you paste a JWT, JSON document, password, source code, or any other input into a tool:
- It is processed locally in your browser tab
- It is never transmitted to our servers
- It is never logged, stored, or analysed by us
- It disappears when you close or refresh the page
This is by design and is the core promise of Developer Toolkit. You can verify this by inspecting the browser's Network tab, no POST requests are made when you use a tool.
Local storage (preferences only)
We write a single key to your browser's localStorage:
| Key | Value | Purpose |
|---|---|---|
| theme | “light” or “dark” | Remembers your colour scheme preference |
This is a client-side preference. It is never read by our servers. You can clear it at any time through your browser settings.
Server logs
Our hosting provider (Vercel) collects standard web server logs including IP addresses, request paths, response codes, and timestamps. These are retained for approximately 30 days for security and debugging purposes.
3. Advertising
Developer Toolkit may display advertisements from one of these developer-focused, privacy-respecting ad networks:
Carbon Ads
Carbon Ads shows a single, clearly labelled ad placement per page. They do not use behavioural tracking cookies and serve ads based on contextual targeting.
EthicalAds
EthicalAds is an ad network built specifically for developers that prohibits behavioural tracking. Ads are served based on keywords and geography only.
Ads will be placed only below the tool fold, above the SEO content section. They are never placed inside the tool UI or above the fold.
4. Analytics
If analytics are enabled, we use Vercel Analytics, which is privacy-first: it does not set cookies, does not fingerprint devices, and does not share data with third parties. It collects only aggregate page view counts and referrer domains.
5. Cookies
Developer Toolkit does not set cookies for tracking or advertising purposes. The only persistent browser storage we use is localStorage for the theme preference described in Section 2.
6. Third-party services
Developer Toolkit loads fonts from Google Fonts via the Next.js font optimisation layer. Next.js pre-downloads and self-hosts font files where possible to minimise third-party requests.
7. Children's privacy
Developer Toolkit is not directed at children under 13. We do not knowingly collect any information from children.
8. Your rights (GDPR / CCPA)
Because we do not collect personal data from tool usage, most data subject rights (access, deletion, portability) are not applicable; there is no data to access or delete.
9. Changes to this policy
We may update this policy as the service evolves. Changes will be reflected in the “Last updated” date at the top of this page. We will note significant changes in the Changelog.
10. Contact
Questions about this policy or requests relating to your data: