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PromptGuard is a security solution built to protect companies from sensitive data leaks through prompts sent to AI tools like ChatGPT, Claude, Gemini, or any Large Language Model (LLM). By analyzing prompts in real time directly in the browser, PromptGuard automatically detects and masks confidential information such as API keys, access tokens, email addresses, credentials, personally identifiable information (PII), and strategic business data — before it ever reaches an AI model. The extension works entirely locally, with zero data sent to external servers, ensuring maximum privacy and compliance with internal data security policies. Whether you're a developer, product manager, support team, or security lead, PromptGuard helps you bring AI into your workflows without putting your company at risk. Prevent human error, protect critical assets, and take back control over what your teams share with LLMs.