Browser Storage and Cookie Tester

Check whether cookies and modern browser storage systems work in your current privacy mode.

Privacy first: This tool runs in your browser. It does not upload device readings to OceanofTools.

Browser Storage and Cookie Tester tool

Run safe read-and-write checks for browser storage and cookies.

How the browser storage test works

The tool writes a uniquely named temporary value, reads it back and removes it. It does not inspect or delete unrelated cookies or saved website data. Storage quotas are estimates supplied by the browser.

Frequently Asked Questions

Will this test delete my browser data?

No. It only removes the temporary OceanofTools test key that it creates.

Why are cookies blocked in private mode?

Some private-browsing and tracking-protection modes restrict storage or remove it when the session closes.

Is the storage quota exact?

No. Browsers can dynamically change quotas based on device space and site usage.

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Practical tool guide

Using Storage & Cookie Tester effectively

Test cookies and modern browser storage. This page is designed to help you inspect or test a result with a clear browser-based workflow rather than making you install a separate utility for a small task.

How to use it

Run the check in the browser and grant a permission only when the feature genuinely needs it. Compare results across browsers or devices when troubleshooting compatibility.

Best used for
  • browser compatibility checks
  • device troubleshooting
  • understanding permission and hardware support
What to verify

Diagnostic results can vary by browser, device, permissions, network conditions or source data, so verify anything business-critical with an authoritative source. Browsers intentionally restrict some hardware and network details for privacy and security, so not every value is available on every device.

Why this workflow matters

Device and browser readings are a snapshot of what the current browser is allowed to expose. Storage & Cookie Tester can help you troubleshoot support, permissions or configuration, but privacy protections may intentionally hide or generalize some values. If you are comparing devices, repeat the check under similar browser and network conditions and note whether permissions, extensions, VPNs or privacy settings differ between tests.

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