Managing multiple AI API keys can be challenging, especially when keys expire or run out of quota. Our API Key Validator provides a secure way to check if your keys for OpenAI, Google Gemini, and Anthropic are valid, what models they have access to, and (where supported) their remaining credits, all without storing your sensitive credentials.
What is an API Key Validator?
An API Key Validator is a diagnostic utility that sends a minimal, non-billing request to an AI provider's endpoint to verify that a key is active and correctly formatted. It helps developers troubleshoot "Authentication Error" messages and verify permissions before deployment.
Why Validate Your API Keys?
- Quickly troubleshoot "Unauthorized" or "Invalid Key" errors in your apps
- Identify which models (e.g., GPT-4 vs GPT-3.5) a specific key can access
- Verify that a newly rotated key is working before deleting the old one
- Check available quota and billing status (where supported by API)
- Ensure keys haven't been deactivated due to security or billing issues
- Privacy-first: Validation logic ensures your key is never stored on our server
How to Validate an API Key
Select Provider
Choose OpenAI, Google Gemini, or Anthropic.
Enter API Key
Paste your key into the secure, encrypted input field.
Run Validation
Click test to send a verification request directly to the provider.
Review Results
See status (Valid/Invalid), model access, and quota details.
Key Features
Multi-Provider Support
Validate keys for OpenAI, Anthropic Claude, and Google Gemini in one place.
Encrypted Handling
Keys are processed over HTTPS and never stored in any database.
Model Access List
See exactly which AI models your key is authorized to call.
Quota Visibility
Checks remaining credit or rate limits where the API allows.
Instant Error Decoding
Translates cryptic API error codes into human-readable advice.
Best Practices
- Never hardcode your API keys in frontend code or public repositories
- Rotate your keys immediately if you suspect they have been compromised
- Use restricted-scope keys (read-only) for validation whenever possible
- Monitor your provider dashboards for unexpected usage even if keys are valid
Common Use Cases
Dev Environment Setup
Verifying that your local environment keys are properly configured.
Billing Troubleshooting
Confirming if a key still has credit after a series of large API calls.
Migration Verification
Testing a new key after upgrading from a trial to a paid plan.
Integration Debugging
Finding out if a 401 error is due to a broken key or a network issue.
Frequently Asked Questions
Is it safe to paste my key here?
We use HTTPS and do not store keys. For maximum security, rotate keys after testing on any third-party tool.
Will this charge my account?
No, we use "list" or "status" endpoints that do not trigger per-token billing.
Does it support Azure OpenAI?
Currently, we support the standard OpenAI, Anthropic, and Google endpoints.
What if my key is invalid?
We will show the exact error message from the provider to help you fix it.
Ready to Get Started?
100% browser-based. Your data never leaves your device.
Open AI API Key Validator