Anonymise, query the AI of your choice, read back with your real data.

“Tacitum” comes from the Latin tacitus, “silent”, “left unsaid”. It is the root of the English word tacit (a tacit agreement, what goes without saying) and the name of the Roman historian Tacitus, famous for his concision. The software's whole purpose fits in that word: once processed, the document falls silent. In the file you share, each piece of personal data becomes a generic label and no table remains.

Yes, provided you anonymise the document before sending it. Everything you hand to a generative AI (ChatGPT, Claude, Copilot, Gemini, Mistral…) goes to servers you don't control: if it contains personal data, that is a transfer subject to the GDPR, and the responsibility remains yours. Tacitum replaces each piece of data locally with a typed, irreversible label. The text keeps all its meaning for the AI, but no longer contains anything identifying. You keep the speed, without the leak.

Yes. Tacitum runs 100% locally on your Windows machine: no file and no data is ever sent over the Internet, no API, no account, no network connection. It works even with no internet connection.

You can — the recipient never can. The document you share offers no way back to the real values: anonymisation is irreversible for whoever receives it. On your side, “Restore mode”, on by default (you can turn it off at any time), keeps an encrypted table on your machine only (tied to your Windows account), automatically wiped and never shared. It lets you recover your values locally and read the AI's answer back with the real names. This table concerns only you and changes nothing about the shared document, which stays anonymous and impossible to re-identify, for the recipient as for the AI.

Seven formats: .docx, .pdf (text, not scanned images), .xlsx, .doc (requires Microsoft Word installed), .pptx, .txt and .csv. You can process several files, or a whole folder, at once.

Tacitum reads scanned documents (photos, image PDFs) and anonymises them, entirely on your machine. The quality of the result depends heavily on the scan itself: resolution, contrast, orientation, sharpness. Recognition is optimised for French and English, and imperfections may remain on difficult documents. That's why Tacitum shows a review step before writing the file: you check the detections and fix anything that needs it, before sharing.

Your licence key arrives immediately by e-mail, along with your invoice. In Tacitum, click "Enter a licence", paste the key, confirm: done. Activation needs a brief internet connection — only the key is checked, never your documents, which never leave your machine. The full walkthrough is in the user guide (French).

A PC running Windows 10 or 11 (64-bit), about 2 GB of disk space and 8 GB of RAM recommended. No special graphics card, no server, no internet connection needed to anonymise: the entire analysis engine is installed on your machine.

10 free conversions, no sign-up. Beyond that, a single licence, one-time payment per user, no subscription: €79, every feature included (all 7 formats, scanned documents, several files at once, updates included). A licence covers one user, i.e. one Windows session: on a device shared by several Windows accounts, plan one licence per user. For multi-user deployment, integration with your AI tools or dedicated support: Enterprise on request. Professional invoice provided.