Effective: September 28, 2026
We count how the site, the documentation and the viewer are used. One system does it, described below. It is ours, it uses no cookies, and it cannot identify you.
The viewer is free, and we want to keep making it better. These counts tell us which guides people actually read, which browsers to support, and when something has stopped working. A file that fails to open is almost never reported to us, so a count is usually the only way we find out.
We do not sell this data, share it, or use it for advertising, and we do not build a profile of you. We could not: see what happens to your IP address below.
Software we wrote, running on our own infrastructure in the European Union. No third-party analytics service and no advertising network is involved.
It records:
In the viewer it also records that you opened an image, and whether it worked. Alongside that: whether the file was one of our examples or your own, whether it came from your computer or from a web address, whether it was a plate or a single image, which button or link you used to open it, and which version of the viewer you were running. If it failed, the reason it failed. If it failed because the file uses a version of the OME-ZARR format the viewer cannot read yet, the version number the file declares, such as 0.6.
Each of those is one of a few set answers, chosen from a list we wrote. The one exception is that format version. It can only ever be a short number like 0.6, and anything else in that field is recorded as "other". Nothing you type, name or select can end up here.
Your IP address is never stored. It is used once, mixed with a secret we throw away and replace every day, to produce a number that tells repeat visits apart within a single day. Because that secret is destroyed, we cannot connect your visits across different days. Within a single day, a visit here and a visit to our main website produce the same number, so we can see that one followed the other.
No cookies and no browser storage of any kind are used for this. If your browser sends Do Not Track or Global Privacy Control, we record nothing at all.
It records nothing about your images. Not filenames, not URLs, not dimensions, not pixel data. See section 4.
The viewer stores data locally in your browser to provide a smooth experience. This data never leaves your device.
| Storage | What | Purpose |
|---|---|---|
| IndexedDB | Image metadata, thumbnails, viewer settings, annotations | Remember recently opened images and restore your last view |
| localStorage | UI preferences (e.g., welcome modal dismissed, storage notice) | Remember small UI choices across sessions |
| File System Access API | Directory handle references (Chrome/Edge only) | Re-open local ZARR folders without re-selecting them |
| Cache Storage | The viewer's own program files. Never image data, which is never cached by design. | Let the viewer start and run with no network connection |
We do not use cookies. The analytics described in section 2 is cookieless by design and uses no browser storage at all. No third-party cookies are set by this site.
Our own analytics is not a third party. It runs on infrastructure we control, in the European Union, and the data goes nowhere else.
We use no third-party analytics service and no advertising network. Nothing on this site sends your visit to anyone else.
Since all viewer data is stored locally in your browser, you have full control:
Find Nuclei Viewer is a scientific tool not directed at children under 13. We do not knowingly collect information from children.
We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated effective date.
For privacy-related questions, contact us at info@find-nuclei.com.
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