Nesgate: AI Data Protection by Nesgate

Keeps passwords, IDs, card numbers and confidential files out of ChatGPT, Claude, Gemini and other AI tools. Runs on your device.

Available on Firefox for Android™

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About this extension

Nesgate checks your message before it reaches an AI tool, so secrets never leave your device by accident.

It works right where you type. In ChatGPT, Claude, Gemini, Copilot, Perplexity, DeepSeek and other AI chat apps, Nesgate reads your message, your files and your images before you send, and shows you what it found. You decide what to hide. Nothing is sent until you press Send.

What it protects:

Passwords, API keys and tokens
ID cards and national ID numbers, for many countries, read from pictures too
Credit cards, bank accounts and IBANs
E-mails, phone numbers and names
Confidential documents and attachments
How hiding works. When you hide a part, it becomes a short label such as [CREDIT_CARD_1] or [NAME_1]. The AI still understands your message, because the meaning stays. The real value never leaves your browser. Your diagnosis, your question and the substance of your work are kept, only the identifiers are hidden.

On your device, and private. Every check runs locally in your browser. If your company uses the Nesgate console, it sees only masked findings for reporting, never what you typed.

Personal or team. Use Nesgate on your own for free, or connect it to a company console for shared policy, custom rules and reporting.

Privacy policy: see the linked policy. Nesgate is built so that neither we nor your organization need to see what you type.

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Permissions and data

Required permissions:

Access your data for sites in the chatgpt.com domain
Access your data for sites in the chat.openai.com domain
Access your data for sites in the claude.ai domain
Access your data for sites in the gemini.google.com domain
Access your data for sites in the copilot.microsoft.com domain
Access your data for sites in the perplexity.ai domain
Access your data for sites in the chat.deepseek.com domain
Access your data for sites in the meta.ai domain
Access your data for sites in the grok.com domain
Access your data for sites in the chat.mistral.ai domain
Access your data for sites in the m365.cloud.microsoft domain
Access your data for sites in the copilot.cloud.microsoft domain
Access your data for sites in the m365copilot.com domain
Access your data for sites in the aistudio.google.com domain
Access your data for sites in the notebooklm.google.com domain
Access your data for sites in the notebook.google.com domain
Access your data for sites in the console.anthropic.com domain
Access your data for sites in the platform.claude.com domain
Access your data for sites in the poe.com domain
Access your data for sites in the chat.qwen.ai domain
Access your data for sites in the tongyi.aliyun.com domain
Access your data for sites in the tongyi.com domain
Access your data for sites in the qianwen.com domain
Access your data for sites in the kimi.com domain
Access your data for sites in the kimi.moonshot.cn domain
Access your data for sites in the doubao.com domain
Access your data for sites in the yiyan.baidu.com domain
Access your data for sites in the wenxin.baidu.com domain
Access your data for sites in the yuanbao.tencent.com domain
Access your data for sites in the chat.z.ai domain
Access your data for sites in the chatglm.cn domain
Access your data for sites in the manus.im domain
Access your data for sites in the genspark.ai domain
Access your data for sites in the you.com domain
Access your data for sites in the phind.com domain
Access your data for sites in the felo.ai domain
Access your data for sites in the duck.ai domain
Access your data for sites in the lmarena.ai domain
Access your data for sites in the pi.ai domain
Access your data for sites in the character.ai domain
Access your data for sites in the chathub.gg domain
Access your data for sites in the app.chathub.gg domain
Access your data for sites in the typingmind.com domain
Access your data for sites in the monica.im domain
Access your data for sites in the app.jasper.ai domain
Access your data for sites in the app.writesonic.com domain
Access your data for platform.openai.com
Access your data for github.com
Access your data for huggingface.co
Access your data for duckduckgo.com
Access your data for deepai.org

Optional permissions:

Access your data for sites in the chatgpt.com domain
Access your data for sites in the chat.openai.com domain
Access your data for sites in the claude.ai domain
Access your data for sites in the gemini.google.com domain
Access your data for sites in the copilot.microsoft.com domain
Access your data for sites in the perplexity.ai domain
Access your data for sites in the chat.deepseek.com domain
Access your data for sites in the meta.ai domain
Access your data for sites in the grok.com domain
Access your data for sites in the chat.mistral.ai domain
Access your data for sites in the m365.cloud.microsoft domain
Access your data for sites in the copilot.cloud.microsoft domain
Access your data for sites in the m365copilot.com domain
Access your data for sites in the aistudio.google.com domain
Access your data for sites in the notebooklm.google.com domain
Access your data for sites in the notebook.google.com domain
Access your data for sites in the console.anthropic.com domain
Access your data for sites in the platform.claude.com domain
Access your data for sites in the poe.com domain
Access your data for sites in the chat.qwen.ai domain
Access your data for sites in the tongyi.aliyun.com domain
Access your data for sites in the tongyi.com domain
Access your data for sites in the qianwen.com domain
Access your data for sites in the kimi.com domain
Access your data for sites in the kimi.moonshot.cn domain
Access your data for sites in the doubao.com domain
Access your data for sites in the yiyan.baidu.com domain
Access your data for sites in the wenxin.baidu.com domain
Access your data for sites in the yuanbao.tencent.com domain
Access your data for sites in the chat.z.ai domain
Access your data for sites in the chatglm.cn domain
Access your data for sites in the manus.im domain
Access your data for sites in the genspark.ai domain
Access your data for sites in the you.com domain
Access your data for sites in the phind.com domain
Access your data for sites in the felo.ai domain
Access your data for sites in the duck.ai domain
Access your data for sites in the lmarena.ai domain
Access your data for sites in the pi.ai domain
Access your data for sites in the character.ai domain
Access your data for sites in the chathub.gg domain
Access your data for sites in the app.chathub.gg domain
Access your data for sites in the typingmind.com domain
Access your data for sites in the monica.im domain
Access your data for sites in the app.jasper.ai domain
Access your data for sites in the app.writesonic.com domain
Access your data for platform.openai.com
Access your data for github.com
Access your data for huggingface.co
Access your data for duckduckgo.com
Access your data for deepai.org

Required data collection, according to the developer:

Personally identifying information
Website activity
Website content

Optional data collection, according to the developer:

Technical and interaction data