Safe Privacy Mask

Masks likely personal info in AI chat and registered input fields locally, before you send. No data leaves your device.

Safe Privacy Mask is a Chrome extension that masks and replaces strings that look like personal or confidential information before you send text to AI chats and web forms. Use it on major AI chat services such as ChatGPT, Gemini, and Claude when pasting email drafts, error logs, support inquiries, code, or internal notes. It detects email addresses, phone numbers, API keys, and more right inside the input field and masks them before sending. All processing happens inside your browser. Your input and detection results are never sent to any external server. [Masking examples] taylor@example.com → [Email] 212-555-0123 → [Phone] API_KEY=sk-example1234567890abcdef → API_KEY=[API key] [When it helps] - Asking AI to summarize or proofread an email Mask email addresses and phone numbers contained in the email body before sending it to AI. - Consulting AI about error logs or code Detect and replace strings that look like API keys or tokens in logs, config files, and code. - Translating or summarizing customer correspondence Register customer names, project names, or internal system names as custom detection words and replace them with any string you choose. - Typing into web forms Even on websites that are not supported out of the box, you can use Safe Privacy Mask by registering the input fields you want to use. [Key features] ■ Masks inside the input field No need to copy your text to another website or external tool. Mask text directly in the input fields of AI chats and registered web forms. ■ Detects strings that look like personal or confidential information Detects email addresses, phone numbers, API keys, ID numbers, and more based on string patterns. ■ Custom detection words Register strings that the standard detection rules cannot judge, such as customer names, project names, internal terms, and product names. ■ Custom regular expressions Register regular expression rules to detect your own string formats. ■ Per-site settings Choose the sites and input fields where Safe Privacy Mask is used. ■ Choose when masking runs Configure when masking is performed to match how you work. ■ No account required No sign-up or login is needed to use Safe Privacy Mask. [Supported sites] After installation, it works out of the box on major AI chat services. You can check the list of supported services on the extension's settings page. On other websites, you can use it by registering the target input fields. It may temporarily stop working correctly due to changes on the web service side. [Privacy] All detection and masking in Safe Privacy Mask happens inside your browser. - Your input is never sent to external servers - Detection results are never sent externally - No browsing history is collected - No ads are shown - No analytics or telemetry is used - No account registration is required Settings are stored in local storage provided by Chrome. To perform masking, Safe Privacy Mask accesses the input fields of the target web pages. This access is used to detect and replace text on your device, never to send it externally. [What Safe Privacy Mask does NOT do] - Send your input to external servers - Store your unmasked text in the cloud - Collect browsing history - Use your information for advertising - Judge the safety of what you send on your behalf [Notes] Safe Privacy Mask detects strings based on their format and on the rules you register. It cannot guarantee detection of all personal or confidential information. Missed detections and false positives may occur depending on notation, context, or unknown formats. Please review the masked text yourself before sending. Safe Privacy Mask is an assistive tool for reducing oversights when typing. It does not replace corporate information management policies, approval procedures, access control, or DLP. When using it in a company or organization, follow your organization's rules. [Difference from Safe Privacy Gate] Safe Privacy Mask is a tool that masks and replaces detected strings. Its sister extension, Safe Privacy Gate, warns you before sending when your text may contain confidential-looking strings. It does not modify your text. - Want to hide it before sending? → Safe Privacy Mask - Want to keep your text unchanged and just get a check before sending? → Safe Privacy Gate [Support] For bugs, missed detections, false positives, or requests for site support, please contact us via the support page. Safe Privacy Mask is free to use. Mask what you don't need to show, before pasting it into AI. Hide it before you send it.