Google Gemini API Key Tester

Test any AI or API key in your browser — instantly see if it's valid, and why it isn't. Nothing is stored.

Test your Google Gemini API key with the generateContent endpoint

Data verified 2026-07-13

Key format & how to get one

Prefix: AIzaSy Example: AIzaSyA1b2C3... Google API keys start with AIzaSy. 1. Visit https://ai.google.dev/ and sign in with Google 2. Click 'Get API key' in the dashboard 3. Create a new API key or use existing one 4. Copy the generated key 5. No payment required for basic usage

How to test

  1. Copy your key from Google AI Studio (aistudio.google.com/apikey).
  2. Paste it into the tester above and click Test Key.
  3. Green means valid; red shows the error. Brand-new keys may need a few minutes — see the note above.

Common errors

CauseFix
The key is malformed or copied incorrectly.Recreate the key in Google AI Studio (aistudio.google.com/apikey) and copy it fully.
The key lacks access to the Generative Language API, or the API isn't enabled on the project.Enable the Generative Language API for the key's Google Cloud project.
Free-tier rate or daily quota exceeded.Wait and retry, or enable billing for higher quota.

Google Gemini API docs →

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