MaskPaste

What it does

MaskPaste is a local-first macOS app that masks sensitive text — names, companies, addresses — before you paste into ChatGPT, Claude, or any AI. Drag-select what to hide, pick a replacement, copy. When the AI replies, paste it back and your originals return. No accounts, no telemetry, nothing leaves your Mac. Built for anyone using AI in client work, healthcare, legal, or any context where pasting raw text feels risky.

MaskPaste is a local-first masking tool that masks sensitive text before you paste into AI, then helps you restore the original wording later.

MaskPaste lets you mask sensitive details on your device, without sending or saving your text or replacement rules to any external server, before you paste into AI. Replace sensitive details like names, company names, or addresses with natural aliases, all on your device. Review the masked text on screen, then copy it directly into your prompt without extra cleanup. Once text has been masked, you can use your saved rules to restore the original wording at any time. Your text and replacement rules stay on your device instead of being uploaded to any external server. Mask sensitive details locally and reduce exposure before anything reaches an AIfrom maskpaste.com

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