ChistStudioOverview
ChistStudio ("we", "the site") provides free network and developer diagnostic tools at chiststudio.com. This page explains what information is collected when you use the site, how each tool handles the data you enter, and how advertising works here. We built this policy to be genuinely readable, not just legally defensive — most of it is a straightforward description of the technical choices already made throughout the site.
What runs entirely in your browser
Most tools on ChistStudio — the Subnet Calculator, JWT Decoder, Base64 Encode/Decode, JSON Formatter, Regex Tester, Hash Generator, UUID Generator, URL Encoder/Decoder, Unix Timestamp Converter, and Color Converter — perform all calculations locally in your browser using JavaScript. Nothing you type into these tools is transmitted anywhere, logged, or stored by us. Closing the tab or refreshing the page erases the input completely.
Tools that make an external request
A few tools need to reach an external data source to function, since the data they look up (DNS records, domain registration, IP geolocation, and so on) doesn't exist locally in your browser. For each of these, only the minimum required input is sent — never more:
- DNS Lookup sends the domain name you enter to Google's public DNS-over-HTTPS resolver.
- WHOIS Domain Lookup, Security Headers Analyzer, SSL Certificate Checker, Website Response Time Checker, and MAC Address Vendor Lookup send the domain, URL, or MAC address you enter to our own backend (a Cloudflare Worker), which queries the relevant public registry or data source on your behalf.
- My IP & Geolocation and ASN / BGP Lookup query a third-party IP geolocation API to look up your public IP address or one you provide.
- Password Strength & Breach Check hashes your password locally using SHA-1 and sends only the first five characters of that hash to the Have I Been Pwned API — a technique called k-anonymity that means your actual password, or even its full hash, never leaves your browser.
None of these requests include your name, email, or any other personal identifier — only the specific value you chose to look up (a domain, IP, MAC address, or partial hash).
Server logs
Like virtually every website, our hosting provider (Cloudflare) automatically logs basic technical data for every request — IP address, browser type, and timestamp — for security and abuse-prevention purposes. We do not separately collect, sell, or analyze this data for tracking individual visitors.
Cookies and advertising
ChistStudio intends to display advertising through Google AdSense to help cover hosting costs. Google and its advertising partners may use cookies to serve ads based on your prior visits to this and other websites. You can learn about and opt out of personalized advertising through Google's Ad Settings, and more broadly through the Digital Advertising Alliance.
Analytics
We may use privacy-respecting analytics to understand aggregate traffic patterns (which tools are used, roughly how much traffic the site receives) in order to improve the site. This data is aggregated and not used to identify individual visitors.
Children's privacy
ChistStudio is a technical reference tool intended for developers, network engineers, and students, and is not directed at children under 13. We do not knowingly collect personal information from children.
Changes to this policy
If this policy changes, the "last updated" date at the top of this page will be revised accordingly.
Contact
Questions about this policy can be sent to the contact address listed on the site's About section.