Guides

Short, practical pages on keeping other people's data out of places it shouldn't go.

AI chats

• How to anonymize data for ChatGPTDetect, review, replace with placeholders, restore the answer.
• Is it safe to paste sensitive data into ChatGPT?What happens to a prompt, what the GDPR asks, what never belongs in one.
• Use ChatGPT for HR emails without sharing employee dataReference letters, rejections and notes, and what to keep out entirely.

Tickets, files and code

• Anonymize customer emails and support ticketsRealistic fake data for tickets that go to an AI chat, a vendor or training material.
• Anonymize a CSV file for test dataReplace whole columns, catch what hides in free-text ones, keep the file importable.
• Anonymize or pseudonymize data in ExcelThrough CSV and back, without the sheet leaving your computer.
• Mask personal data and secrets in log filesStable pseudonyms for IPs, emails and tokens that keep the log useful.
• Remove API keys and secrets before you share codeKnown key prefixes, passwords in URLs, private keys, and what to do after a leak.
• Redact text online without uploading itMask values in plain text in your browser, and how to check a tool really stays local.

Background

• Pseudonymization vs. anonymizationWhat the difference means under the GDPR, and which one a text anonymizer gives you.
• Detect and redact national ID numbersFormats and check digits per locale pack, from the US SSN to the Italian codice fiscale.