Skip to main content

Gemini API Key Validator

Validate your Google Gemini API key format and generate test code snippets to verify model access across all Gemini models.

✓ Key format validation ✓ Model access checker ✓ Code snippet generator

API Key

Your key stays in the browser — never sent to our servers.

Target Model

Generated Test Code

 
  
 
Key Format & Status Reference
 
 
 
Valid Key Patterns
 
 
 ✓ 
AIzaSy[A-Za-z0-9_-]33 — AI Studio key (39 chars)
 
 
 ~ 
Vertex AI uses OAuth tokens, not API keys — different auth flow
 
 
 
 
 
Common Error Codes
 
 
400Invalid API key format
 
403Key revoked / billing required
 
404Model not found / no access
 
429Rate limit / quota exceeded
 
200Key valid, model accessible
 
 
 
 
 
Frequently Asked Questions
How do I get a Google Gemini API key?▼
Visit Google AI Studio (aistudio.google.com), sign in with your Google account, and click 'Get API key'. Free tier keys work for Gemini 1.5 Flash and Pro with rate limits. For production use, enable billing in Google Cloud Console and upgrade to a paid tier.
What format is a valid Gemini API key?▼
Gemini API keys from Google AI Studio start with 'AIza' followed by alphanumeric characters, typically 39 characters total (e.g., AIzaSyXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX). Keys from Vertex AI may have different formats.
Why does my Gemini API key fail validation?▼
Common reasons: (1) Key was deleted or revoked in Google AI Studio, (2) Billing not enabled for paid models, (3) Using a Vertex AI key but calling the Gemini API endpoint, (4) IP restrictions on the key, (5) Quota exhausted for the day/minute.
What models are available with Gemini API?▼
Current models: Gemini 2.5 Pro (most capable, reasoning), Gemini 2.0 Flash (fast, multimodal), Gemini 1.5 Pro (1M context), Gemini 1.5 Flash (efficient, free tier). Access depends on your API key tier and region.
Is it safe to test my API key in this tool?▼
This tool validates key format locally (client-side) without sending your key anywhere. The 'live test' option sends a minimal request to Google's API directly from your browser — the key never touches our servers. Always rotate keys if you suspect exposure.
 
 Share this tool:  
X / Twitter
  
LinkedIn
 
   
 
  ✓ 60,000+ developers use DevPlaybook
  ★★★★★ 4.8 / 5 on Gumroad   ✓
MIT licensed · Instant download
  ✓
No login required
 
 
 
 
 
Related Products
 on Gumroad 
 
  
 🤖 $19 
 
AI Prompt Engineering Toolkit
 
58 structured prompt templates for Claude, ChatGPT, and Gemini — organized by use case. Code Review, Debugging, Documentation, Architecture, and 10 model-specific tips. Stop writing prompts from scratch.
 
Buy on Gumroad →
  
 💬 $24 
 
AI Developer Prompts Pack
 
55 battle-tested prompt templates for the workflows developers actually use: code review, debugging, architecture, documentation, and testing. Stop writing prompts from scratch.
 
Buy on Gumroad →
  
 ⚡ $29 
 
Developer Productivity Bundle
 
Stop rebuilding the same setup every project. 51 VSCode snippets, 40 Git aliases, 5 Docker Compose stacks, 5 GitHub Actions workflows, 5 README templates, and a dotfiles kit. Set up a professional dev environment in under an hour.
 
Buy on Gumroad →
  
  
You Might Also Need
 
  
LLM Cost Calculator
 
Compare monthly API costs across GPT-4o, Claude Sonnet, Gemini Pro, and 12+ models. Enter daily requests and token counts for instant cost estimates.
 
Open free tool →
  
OpenAPI Validator
 
Paste your OpenAPI 3.x spec (YAML or JSON) to validate structure, find missing required fields, detect duplicate paths, check for missing operationIds, and get errors and warnings with path references.
 
Open free tool →
  
AI Model Comparator
 
Compare top LLMs side by side: GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, Llama 3, and more. Compare context window, pricing per million tokens, strengths, and multimodal support.
 
Open free tool →
  
 
More Free Tools
 
  LLM Cost Calculator  OpenAPI Validator  AI Model Comparator  AI Hallucination Detector  AI Model Comparison Tool  AI Safety Checklist Generator  CrewAI Agent Config Generator  AI Prompt Cost Calculator  Jotai Atom Explorer  Token Counter & Cost Estimator  AI Token Cost Calculator  API Response Mock Generator  API Response Time Tester  OpenAPI Schema Validator  CSS Container Query Builder  LLM Context Window Calculator  Font Pairing Preview  OpenAPI Mock Generator  LLM Prompt Cost Calculator  AI Model Context Window Visualizer  LLM JSON Schema Builder  AI Agent Run Cost Tracker  AI Pipeline DAG Builder  AI Rate Limit Calculator  LLM Benchmark Calculator  Prompt Injection Tester  LangChain PromptTemplate Builder  API Test Case Generator  AI Model Comparison Table  LLM Prompt Template Builder  AI Doc Generator — Pro Tool  API Request Builder  MySQL Query Explainer  PostgreSQL EXPLAIN Analyzer  Prompt Token Estimator  AI Model Benchmark Comparator  API Mock Server Config Generator  Cron Expression Explainer  OpenAI Prompt Tester  LLM System Prompt Analyzer  Vibe Coding Prompt Optimizer  AI IDE Comparator  AI Prompt Token Estimator  AI Context Window Visualizer  RAG Chunk Size Optimizer  AI API Rate Limit Calculator  AI Commit Message Generator  AI Regex Explainer — Pro Tool  AI System Guardian  API Rate Limit Calculator  API Response Formatter & Analyzer  HTTP API Tester  LLM Token Counter  Mermaid Diagram Generator  Elasticsearch Query Tester  mTLS Certificate Chain Builder  JS Prototype Chain Visualizer  REST API Request Builder  OpenAI Token Counter  System Prompt Builder  API Response Mocker  AI Agent Memory Planner  Token Context Calculator  LLM Prompt Caching Calculator  Multi-Agent Orchestration Planner  OpenAI Function Calling Generator  Embedding Storage Calculator  Core Web Vitals Guide  HTTP Headers Analyzer  API Key Generator  AI Code Review — Pro Tool  AI Error Explainer — Pro Tool  AI SQL Builder — Pro Tool  AI Unit Test Generator — Pro Tool  Color Palette Generator  Docker Compose Generator  HTTP Methods Reference  HTTP Code Snippet Generator  HTTP Status Code Reference  HTTP Status Code Reference  JSON Diff Viewer  JSON Diff  JWT Decoder  Prompt Template Builder  Regex Tester  RSA Key Pair Generator  Rate Limiter Tester  API Changelog Generator  HTTP Mock Response Builder  iCal Event Generator  SMTP Server Tester  Rate Limit Calculator  Biome Config Generator  CORS Policy Builder  Terraform Variable Validator  GCP Service Account Key Checker  Haproxy Config Validator  Zod Schema Generator  SBOM Generator  HTTP Status Code Lookup  TOTP Code Generator  AI Variable Namer  AI PR Description Generator  AI JSDoc Generator  HTTP Status Code Lookup  Vue Component Generator  K8s Resource Limits Calculator  HTTP Status Code Reference  Regex Flags Explainer  OpenAPI Spec Validator  OAuth2 Flow Visualizer  Terraform Variable Builder  Playwright E2E Testing Guide  Mock Service Worker (MSW) API Mocking Guide  Pulumi Modern IaC Guide  Core Web Vitals Calculator  RAG Chunking Calculator  Solana Program ID Generator  Multi-Chain Wallet Address Validator  HTML5 Canvas API Playground  GCP Service Account Key Auditor  SWR Config Generator  RAG Chunking Calculator  TypeScript Discriminated Union Builder  Core Web Vitals Budget Calculator  JWT Decoder & Validator  Blockchain Transaction Fee Calculator  Database Query Cost Analyzer  
 
 
Related Articles
 
  
Apr 1, 2026 · 14 min read
 
Gemini 2.5 Pro API Guide for Developers 2026: Integration, Pricing & Use Cases
 
Complete guide to using the Gemini 2.5 Pro API in 2026. Covers model lineup, Python and Node.js integration, multimodal inputs, extended thinking, streaming, long context, function calling, token counting, pricing, and common errors.
  
Apr 2, 2026 · 11 min read
 
LLM Observability Tools 2026: OpenTelemetry, Langfuse, Arize Phoenix Compared
 
Compare LLM observability tools for 2026: Langfuse, Arize Phoenix, Helicone, LangSmith, and OpenTelemetry for LLMs. Tracing, evals, cost tracking, and self-hosting options.
  
Apr 2, 2026 · 13 min read
 
Prompt Engineering Techniques 2026: Chain-of-Thought, RAG, and Advanced Patterns
 
Advanced prompt engineering guide for 2026: Chain-of-Thought, Tree-of-Thought, RAG integration, few-shot learning, prompt chaining, and evaluation techniques.
  
Apr 1, 2026 · 11 min read
 
LLM Observability 2026: LangSmith vs Helicone vs Arize Phoenix Compared
 
Complete guide to LLM observability platforms in 2026. Compare LangSmith, Helicone, and Arize Phoenix for tracing, evaluation, cost tracking, and debugging AI applications in production.
  
Apr 1, 2026 · 13 min read
 
Prompt Engineering Techniques 2026: Chain-of-Thought, Few-Shot, and RAG Patterns
 
Master practical prompt engineering in 2026. Learn chain-of-thought prompting, few-shot examples, RAG integration patterns, and advanced techniques like tree-of-thought and self-consistency with real code examples.
  
 
 
  
 
 
 
Enjoying this tool? Get more like it.
 
Weekly developer tool guides, productivity playbooks & AI tricks. Free. No spam.
 
 
  
 
 
  
 
 
 
 DevPlaybook Pro 7 days free 
 
Unlock AI-Powered Dev Tools
 
     
  • ⚡ AI Code Review, Doc Generator & SQL Builder
    •  
  • ⚡ All premium templates & early access
    •  
  • ⚡ Member discounts on Gumroad products
    •  
 
 
 
Start Free Trial →
 
$9/mo after trial · Cancel anytime
 
 
 
  
 
Want the full toolkit?
 
Get DevPlaybook Pro
 

Every template, guide, boilerplate, and automation script in one bundle.
    13 premium products — grab them all at once and save big.

 
 $79 
 $241 separately Save $162 (67% off) 
 
 
Get DevPlaybook Pro — $79 →
 
MIT licensed · Instant download · No subscription
 See what's included → Browse all deals →