You know the game.
Never give up
your data again.
WhatPersists scans all data that websites are able to access from your browser. Makes you understand what kind of data you could be exposing online.
Reading now: … · … · …
Built by Samuel Sullins (newsletter specialist)
Just scanned
Device info scan
Don't let them hurt you.
This device
Scan incomplete
Device
reading
Display
reading
Graphics
reading
Composite identifier (partial)
computing
Signal detail
9 more
Platform
reading
Timezone
reading
CPU threads
reading
Locale
reading
Fonts resolved
reading
Canvas hash
reading
Touch points
reading
Cross site index
requires full scan
Prior sessions
requires full scan
Stable across reloads. Survives private browsing.
permanent
Persistence
never
Expiry
no
Revocable
Why this works
Blocking cookies stops one identifier. It does not stop the other forty. Your font stack, your GPU string, your clock offset and your renderer quirks combine into something specific enough to pick you out of a very large crowd, and none of it is stored on your machine, so there is nothing for you to delete.
The partial identifier above uses ten signals. A full scan uses the rest, then checks the composite against the index to see how long it has been following you.
1.4B
Identifiers indexed
3:32
Median time to re-ID
99.6%
Uniqueness rate
See what you are giving away.
Takes two seconds. Nothing leaves your device.