Before pasting Japanese text into an AI chat, take a moment to review the details you do not want to share.I made AI Input Guard, a small Japanese-language offline browser tool. For example, the fictional text “メール: sample@example.invalid” becomes “メール: ［伏せ字］”. It flags rule-based candidates such as emails, phone numbers, some labelled names and secret-like strings.No AI analyzes your input, and the tool does not upload it or connect to ChatGPT. It can miss details or mask too much, so you still need to review the result.Free demo: fictional examples only.Full version: ¥980 one-time, supports your own text and extra words.Desktop browser; Japanese interface. Built with AI assistance.Details and free demo:https://hidaka-local.booth.pm/items/8963545?utm_source=contra&utm_medium=community&utm_campaign=ai_input_guard_20261022&utm_content=chatgpt_postIf you try it, I would appreciate hearing which step is unclear. Please do not share private text or credentials.