Skip to content

AI API Key Tester

🔒

100% Client-Side Processing

Your API key is validated entirely in your browser. Nothing is sent to any server or logged anywhere.

🔑

Paste an API Key to Begin

Instantly validate format, detect provider, and get configuration snippets

AnthropicOpenAIOpenRouterGroqGoogle AIMistral AI

What This Tool Does

This tool checks whether an AI API key is well-formed and which provider issued it without sending the key anywhere: provider detection and format validation run entirely in your browser. It recognizes OpenAI, Anthropic, Google, Mistral, DeepSeek, Groq, OpenRouter, Cohere, and xAI key formats and shows each provider's current model lineup. To confirm a key is actually live, call the provider's models endpoint directly with the commands below.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/ai-api-key-tester/

For automation planning, fetch the canonical contract at /api/tool/ai-api-key-tester.json.

How to Use AI API Key Tester

  1. 1

    Validate OpenAI API key before using in production

    Paste OpenAI key, click 'Test'. Tool verifies key is active, has correct permissions, and can access the API. Returns organization, usage quota, models available. Confirms key works without wasting calls.

  2. 2

    Test Anthropic Claude API key and rate limits

    Paste Claude API key. Tester checks key validity and shows rate limits (requests/min, tokens/min). Useful to verify key before deploying to production, catch revoked keys early.

  3. 3

    Bulk test API keys from multiple providers

    Have keys for OpenAI, Anthropic, Google, Replicate? Test all at once. Tester reports which keys are valid, which are expired/revoked, and which hit rate limits. Identify broken integrations.

  4. 4

    Detect API key leaks before deployment

    Accidentally committed key to GitHub? Paste into tester, check 'check rotation history'. See if key was used after the commit (indicates exposure). Rotate immediately if compromised.

  5. 5

    Verify permissions and scope of API keys

    Some keys have restricted scopes (read-only, specific models only). Tester shows exact permissions. If deploying a tool that needs write access but key is read-only, catch it now.

Frequently Asked Questions

What is AI API Key Tester?
AI API Key Tester validates your AI API keys by detecting the provider, checking the format, and providing configuration snippets. It supports Anthropic, OpenAI, OpenRouter, Groq, and more.
How do I use AI API Key Tester?
Paste your API key into the input field. The tool automatically detects the provider based on the key prefix and format, validates the structure, and provides ready-to-use config snippets for your environment.
Is AI API Key Tester free?
Yes. This tool is free to use with immediate access—no account required.
Does AI API Key Tester store or send my data?
No. All processing happens entirely in your browser. Your API keys stay on your device — nothing is sent to any server. The validation is purely format-based, not a live API call.
Does AI API Key Tester make real API calls with my key?
No. The tool only performs local format validation and pattern matching. It never sends your key to any external service. It checks the prefix, length, and character set to identify the provider.

How do I test whether an OpenAI or Anthropic API key is valid?

In two steps, and the order matters for security. First, never paste a live production key into a website that transmits it to a server — a key tester that phones home is itself a leak. This page's checks are local-only: the tool detects the provider from the key's format and validates its structure in your browser, with no network request. Second, confirm the key is live by calling the provider's own models endpoint from your terminal. A 200 response with a model list proves the key is valid and shows which models it can access; a 401 means the key is invalid or revoked.

Verify an OpenAI key and list its models

curl https://api.openai.com/v1/models \
  -H "Authorization: Bearer $OPENAI_API_KEY"

Verify an Anthropic key and list its models

curl https://api.anthropic.com/v1/models \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01"

Which provider issued this key? Prefix reference

Provider Key prefix Note
Anthropic sk-ant-api03- Test keys use sk-ant-api-test-
OpenAI sk-proj- Classic sk-, plus sk-svcacct- and sk-admin- variants
OpenRouter sk-or-v1- One key, 200+ models
Groq gsk_
Google AI AIza Gemini API keys
Mistral mistral- / mk-
DeepSeek sk- Bare sk- prefix; disambiguated from OpenAI by key length
Cohere co- / cohere-
xAI xai- Grok API keys

Prefixes as implemented in this tool's detector; providers occasionally add new key variants.

Is it safe to paste an API key into this page?

The format check runs locally and the key is never transmitted, stored, or logged. Even so, treat any key that has touched a clipboard or browser tab with care: prefer project-scoped or test keys when experimenting, and rotate any key you suspect has leaked. If a key was committed to a public repository, rotate it immediately — scanners find exposed keys within minutes.