Remove PII from LLM Prompts
Protect user privacy by redacting sensitive data before sending prompts to OpenAI or other large language models.
Free tool · No signup · Data never stored
Try the Prompt Redaction Tool →LLM prompts often contain sensitive data
Real-world LLM prompts frequently include user content copied directly from applications, tickets, chat transcripts, or logs.
That data may contain:
- Email addresses and names
- Phone numbers and account IDs
- IP addresses and session data
- Internal identifiers or secrets
Why sending raw PII to LLMs is risky
Even when providers offer strong security guarantees, sending raw PII to third-party AI services expands your compliance surface.
Privacy-by-design means minimizing exposure — not just trusting downstream systems to handle sensitive data correctly.
Deterministic prompt redaction
Maskify removes PII from prompts before they are sent to LLM APIs, preserving semantic meaning while eliminating regulated identifiers.
- Works with unstructured text or JSON prompts
- Redacts emails, phones, IPs, IDs, and more
- Consistent output across retries and services
- No model-based guessing or hallucination
Example: redacting an LLM prompt
Summarize this support ticket:
User: jane.doe@example.com
Phone: +1 415 555 0199
Issue: Unable to log in from IP 203.0.113.10
Summarize this support ticket:
User: [EMAIL]
Phone: [PHONE]
Issue: Unable to log in from IP [IP_ADDRESS]
The prompt remains useful while removing personal data.
Common LLM privacy use cases
- Sanitize prompts sent to OpenAI or Anthropic
- Protect user data in AI-powered support tools
- Reduce compliance exposure in AI workflows
- Enable safe experimentation with real data
Remove PII from prompts instantly
Use the free Maskify playground to redact PII from prompts before they reach any LLM provider.
Open the Prompt Redaction Tool →