Browsers expose very little information about RAM: the value available through the API is rounded and clamped, and some browsers do not report it at all. This makes it harder for websites to identify a device and track its user.
The test allocates and fills memory blocks until the browser refuses another allocation or closes the tab.
The page shows the approximate device memory reported by the browser when that information is available. The stress test then measures a different value: how much memory the current tab can allocate, fill, and verify under the current system load.
The confirmed allocation is a practical lower bound rather than the exact physical RAM capacity. Browser process limits, other programs, compressed memory, and disk swap can make it lower or higher than the installed RAM.
The test allocates memory in small blocks. Each block is fully filled, sampled for verification, and retained. After a block succeeds, its total is written to local storage. If the browser refuses a new allocation, the test stops normally. If the browser terminates the tab, reopen this page to see the last confirmed value.
A web page runs inside the browser sandbox and cannot address every physical memory cell or identify a particular DIMM. If your computer freezes, restarts, shows corrupted data, or displays memory-related errors, use Windows Memory Diagnostic or a bootable tool such as MemTest86. A bootable diagnostic can test memory without the normal operating system occupying most of it.
No. It shows an approximate browser value and the confirmed amount that one tab could allocate. Browser limits, memory compression, swap, and other applications can change the result.
The test intentionally keeps every allocated block in memory. When the browser or operating system reaches its limit, it may terminate the tab. After each block is successfully allocated and filled, the amount of allocated memory is saved in local storage.
It can verify only the blocks allocated to this tab and cannot test every physical memory address. Use a bootable diagnostic such as MemTest86 when you need to check RAM for hardware faults.