Why
Phasmid is an open-source Chromium build that presents one coherent, realistic device to websites. Realistic means sampled from real machines: the combinations of browser, operating system, graphics card, screen, fonts and locale that actually occur. Every visit here adds one real combination to that pool, and shows you how identifiable your own browser is.
What a visit records
- What any website's scripts can read, from the page and from web workers: browser and version, operating system, CPU thread count and memory class, screen and window size, graphics card as WebGL and WebGPU report it, canvas, WebGL and audio rendering hashes, the fonts and speech voices available, time zone, languages, media device counts (never names or labels), codec and permission support.
- The headers your browser sends with every request: User-Agent, Client Hints, Accept-Language and similar.
- The time of the visit.
What it does not record
- No IP address. A per-address limit on how often a visit can start uses it in memory only.
- No cookies, no login, no tracking across visits. Each distinct fingerprint is stored once. So that a return visit does not send the same data again, your browser keeps the fingerprints it has sent in its own local storage; that list is never sent anywhere.
- Nothing stays in your browser: the service worker the analysis uses is removed when it finishes.
- No camera, microphone or location access. The page counts media devices but never asks to open them.
Your fingerprint
Show my fingerprint lists what your browser answered and a hash of all of it together. It is computed in your browser from what was just read; nothing is looked up. Are you unique? then compares your fingerprint, operating system, browser, language and time zone with every distinct fingerprint collected, today, over the last 7 to 90 days, or all time. Those counts are updated about once an hour.
Getting a cleaner capture
Use a normal window at its usual size, page zoom 100% and DevTools closed. Browser extensions that change what pages see (privacy and anti-fingerprinting extensions) change the result too; that is fine, it is still a real browser.