Anonymise on your computer, query the AI of your choice, read back locally 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, for your documents: Tacitum analyses and anonymises them 100% locally, on your Windows machine, and works even with no connection. No document and no content is sent over the Internet, no analysis API, no account. Only short technical exchanges, never a document, take place with our server (licence, updates, language packs downloaded at your request, usage measurement: see the privacy policy). With the optional AI Connector, only the anonymised text you have reviewed goes to your assistant.

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, “Restorable 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.

Yes. French and English are included. For Spanish (Spain, Mexico, Argentina, Colombia, Chile), German (Germany, Austria, Switzerland) and Italian (Italy, Italian-speaking Switzerland), Tacitum downloads the language pack once, when you ask for it: free, a few dozen MB, from Settings → Document languages. It then recognises local identifiers (DNI, CURP, RUT, Steuer-ID, AHV, codice fiscale, partita IVA…) and applies labels in the document's language ([NOMBRE], [CORREO], [NAME], [E MAIL], [COGNOME]…). The download is a plain request with no document, licence key or identifier (the server only sees your IP address, as with any connection); analysis stays 100% offline. Tacitum's interface is available in French, English, Spanish, German and Italian. Details in the user guide.

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 and a technical fingerprint of your Windows session are checked, never your documents, which never leave your machine. The full walkthrough is in the user guide.

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 (no VAT applicable, art. 293 B CGI), every anonymisation feature included (all 7 formats, scanned documents, several files at once, updates to the purchased version included). With the AI Connector (Claude Desktop or Codex Desktop, one year, no auto-renewal): the Tacitum + AI Connector bundle at €148, or the AI Connector alone, later, from inside Tacitum: €69 for one year. 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. Optional: the AI Connector, €69 for one year, no auto-renewal.

The AI Connector links Tacitum to Claude Desktop and Codex Desktop: you ask the assistant for an analysis, Tacitum anonymises the document on your machine and shows you what goes out, and the assistant only receives the masked text, plus non-identifying details (anonymised document title, format, number of masked items per category). Its answer is read back in clear on your side, and can become a Word document with your real values. It costs €69 for one year (no VAT applicable, art. 293 B CGI), on top of the Tacitum licence, and is purchased from inside the application. You can try it for free: the 10 trial conversions also work with the assistant. It is not a subscription: no automatic renewal, no charge without a new purchase; you are warned before it expires. Supported assistants: Claude Desktop and Codex Desktop (Windows). The AI Connector guide walks through the whole flow.