Catch secrets before send
PromptShield scans for API keys, bearer tokens, JWTs, private key blocks, and .env-style secret assignments before a message leaves the page.
Chrome Extension · Free
Catch secrets before they reach AI prompt boxes.
Local prompt safety for API keys, tokens, and sensitive data.
Local Detection
0 Prompt uploads
1-click Chrome install
Free No cost
Features
Everything PromptShield does
One tool. One job. Done well.
Redact and review
Replace risky values with safe placeholders like [REDACTED_API_KEY], then review the prompt again before sending.
Local by design
Prompt checks run in your browser. Settings and counters stay in chrome.storage.local, and prompt history is not stored.
Control the strictness
Use normal mode for warnings, strict mode for stronger blocking, and per-site pause when you need temporary control.
Who it's for
Built for people who...
Developers pasting code snippets, logs, or config into AI prompt boxes
Founders and operators who want a simple guardrail for sensitive data
Teams that need local-only prompt checks without a backend service
How it works
Up and running in under a minute.
No configuration required.
Install PromptShield
Add it to Chrome from the Web Store. No account, no backend setup, no API key required.
Type your prompt as usual
PromptShield watches supported prompt boxes locally and checks for risky content before send.
Review or redact
If sensitive data is found, block, redact, or review the prompt before deciding what to send.
Detects API keys, tokens, private keys, and secret assignments
Redacts risky values with safe placeholders before review
Runs locally with no backend and no prompt uploads
FAQ
Common questions
Does PromptShield upload my prompts?
No. Detection runs locally in your browser. PromptShield does not use a backend service, external AI API, telemetry, or prompt upload flow.
What can PromptShield detect?
It checks for API keys, access tokens, JWTs, bearer tokens, private keys, secret assignments, email addresses, phone numbers, internal URLs, custom domains, and custom watchwords.
Does PromptShield store prompt history?
No. It stores only extension settings and basic counters in chrome.storage.local. Prompt text and prompt history are not stored.
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Ready? It's free.
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Install PromptShield — It's Free