Cookies Policy

Cookies are small text files that are placed on your device (computer, smartphone, or tablet) when you visit a website. They are widely used to make websites work more efficiently and to provide information to website owners.

Cookies can be session cookies (deleted when you close your browser) or persistent cookies (remain on your device for a set period or until manually deleted). They can also be first-party (set by the site you are visiting) or third-party (set by a different domain).

Responsive Test Tool is designed to be a privacy-first, client-side tool. We use an absolute minimum of cookies. Specifically, we only use cookies for the following purposes:

• Theme Preference: We store your light/dark mode preference locally so you don't have to re-select it each visit.
• UI Settings: Basic interface preferences (e.g., sidebar state, selected viewport) may be stored locally on your device.
• Cookie Consent: We store your cookie preferences so you are not shown the consent banner on every visit.

The table below details every category of cookie used on this site, along with their purpose and retention period.

We use a very limited set of third-party services that may set their own cookies. These services have their own independent privacy and cookie policies.

If you consent, we use Google Analytics to understand how visitors interact with the site in aggregate. This helps us improve the tool. Google Analytics uses pseudonymous identifiers and does not collect personally identifiable information through our implementation. We have IP anonymization enabled.

• Google Analytics Privacy Policy: policies.google.com/privacy
• Google Analytics Opt-Out: tools.google.com/dlpage/gaoptout

Our site is protected by Cloudflare, which may set security-related cookies as part of its bot protection and DDoS mitigation services. These cookies are classified as strictly necessary and cannot be opted out of without disabling essential site protection.

• Cloudflare Privacy Policy: cloudflare.com/privacypolicy

You can manage your cookie preferences at any time using the controls below. Changes take effect immediately.

Preferences saved successfully.

In addition to our preference center, you can manage cookies at the browser level. Most modern browsers allow you to view, block, or delete cookies. Note that disabling all cookies may impact the functionality of this and other websites.

• Google Chrome: Settings → Privacy and Security → Cookies and other site data.
• Mozilla Firefox: Options → Privacy & Security → Cookies and Site Data.
• Apple Safari: Preferences → Privacy → Manage Website Data.
• Microsoft Edge: Settings → Cookies and site permissions → Manage and delete cookies.
• Opera: Settings → Advanced → Privacy & Security → Site Settings → Cookies.

Some browsers include a "Do Not Track" (DNT) feature that signals to websites that you do not want to be tracked. Because there is currently no industry-wide standard for responding to DNT signals, our site does not currently alter its behavior based on DNT headers.

However, given our minimal use of tracking technologies, this has limited practical impact for most users. If you would like to ensure no analytics data is collected, you can disable analytics cookies using the preference center in Section 05 above.

We may update this Cookies Policy from time to time to reflect changes in our practices or for legal, technical, or business reasons. When we make significant changes, we will update the "Last Updated" date at the top of this page.

We encourage you to review this page periodically. Continued use of our site after any changes constitutes your acceptance of the updated policy. If you disagree with any changes, you should adjust your cookie preferences or discontinue use of the site.

If you have any questions, concerns, or requests regarding this Cookies Policy or our data practices, please don't hesitate to reach out. We aim to respond to all inquiries within 5 business days.