Privacy Policy

Last updated: April 2026

NiuNiu Tools is built around a simple principle: your data belongs to you. All tools process data locally in your browser. Nothing you type, paste, or upload is ever sent to our servers — because we don't have servers that receive your input.

Data We Do Not Collect

We do not collect, store, log, or transmit:

  • Any content you enter into our tools (JSON, passwords, URLs, text, images, etc.)
  • Your name, email address, or any other personal information
  • Your browsing history or behavior on this site
  • Device identifiers or fingerprints
  • Location data beyond what is inferred from your IP address by third-party services (see below)

How Our Tools Work

Every tool on NiuNiu Tools runs as client-side JavaScript in your browser. When you paste JSON into the formatter, generate a password, encode a Base64 string, or compress an image — all of that computation happens on your device. The data never leaves your browser tab.

This is not just a privacy policy — it is how the site is technically built. There is no backend server receiving your tool inputs. You can verify this by opening your browser's network inspector (DevTools → Network) while using any tool and observing that no requests are made when you interact with the tool.

The IP Lookup Tool

The IP Address Lookup tool is the sole exception to the above. When you look up an IP address, a request is sent directly from your browser to ip.guide, a third-party geolocation API. The queried IP address is transmitted to that service.

NiuNiu Tools does not receive or log the IP addresses you look up. The request goes from your browser to ip.guide directly. Please review ip.guide's privacy policy for details on how they handle queries.

Cookies

NiuNiu Tools does not set any first-party cookies for tracking or analytics purposes.

This site uses Google AdSense to display advertisements. Google AdSense may set cookies on your device to serve relevant ads based on your browsing history. These are third-party cookies managed entirely by Google. You can manage your ad personalization preferences at Google Ad Settings, or opt out of interest-based advertising at aboutads.info.

Third-Party Services

NiuNiu Tools uses the following third-party services:

  • Cloudflare Pages (hosting and CDN) — Cloudflare may log access requests including IP addresses as part of standard server logging. See Cloudflare's Privacy Policy.
  • Google AdSense (advertising) — Google may collect and use data to serve personalized ads. See Google's Privacy Policy.
  • ip.guide (IP geolocation, used only by the IP Lookup tool) — Queries are sent directly from your browser. See their website for details.

Children's Privacy

NiuNiu Tools does not knowingly collect any personal information from children under the age of 13. The site is a collection of general-purpose utility tools with no user registration or data submission features.

Changes to This Policy

We may update this privacy policy from time to time. When we do, we will update the "Last updated" date at the top of this page. We encourage you to review this policy periodically.

Contact

If you have any questions about this privacy policy, please contact us at our contact page or email contact@niuniu188.net.