PromptMask

About

The AI tools you use every day can use your prompts to train their models. Every client name, API key, or Personally Identifiable Information you send is potential training data.

PromptMask stops that.

WORKS WITH: ChatGPT · Claude · Gemini · Perplexity · Grok

It intercepts your prompt before you hit send, runs an on-device AI model entirely in your browser, and replaces sensitive data with labeled placeholders like [NAME 1] or [EMAIL 1]. The AI still gets the full context of your request. Your data never leaves your machine.

WHAT GETS REDACTED
Names, emails, phone numbers, addresses · SSNs and government IDs · Credit cards and bank details · Medical record numbers and insurance IDs · API keys, tokens, and passwords · IP addresses and device identifiers · Order IDs, invoice numbers, case references

HOW IT WORKS
Type your prompt as usual → PromptMask intercepts on send → on-device AI replaces PII with placeholders → you review and confirm → only the safe version reaches the AI.

100% ON-DEVICE. ZERO CLOUD.
The redaction model runs entirely on your device. Downloaded once, cached permanently. No servers. No telemetry. No data collection. Ever.

PLATFORM: Available now on macOS. Linux and Windows support coming soon.

FULL CONTROL: Toggle redaction per site. Enable or disable individual PII categories. Preview every redaction before confirming.

PRICING
Free for all non-commercial use — no account, no subscription, no limits.

Note: PromptMask is in alpha. Core redaction works — expect rough edges.

For commercial use, contact [email protected] for a plan tailored to your organization. Commercial deployments include:

- Fine-tuned redaction trained on your industry's data and terminology
- Custom PII categories — define and expand what counts as sensitive for your organization
- File support — redact sensitive data directly from uploaded documents, not just prompts
- Custom site targeting — extend protection to any website or internal tool, not just supported AI platforms
- On-device and on-premise deployment for air-gapped or compliance-constrained environments

Use AI freely. Keep your data private.