API Key Generator: Create Secure API Keys Online [2025]
Generate cryptographically secure API keys with support for multiple formats and customizable lengths.
API Key Generator
Security Features
Key Generation
- •
Cryptographic Security
Uses Web Crypto API for true randomness
- •
Multiple Formats
Base64, MD5, SHA256, and SHA512 support
- •
Flexible Length
Choose from 8 to 128 characters
Implementation
- •
Client-Side Generation
Keys never leave your browser
- •
URL-Safe Encoding
Safe for use in URLs and headers
- •
No Dependencies
Uses native browser crypto
Common Use Cases
Development
Perfect for generating API keys during development and testing:
- Authentication tokens
- API access keys
- Application secrets
- Test environment credentials
Production
Generate secure keys for production environments:
- Service-to-service communication
- Third-party integrations
- Webhook signatures
- Client authentication
Format Guide
Base64
URL-safe Base64 encoding using - and _ instead of + and /. Perfect for use in URLs and headers. Most versatile format for general API key usage.
MD5
32-character hexadecimal string. While not cryptographically secure for hashing, the generated keys use secure random values and are suitable for API keys.
SHA256
64-character hexadecimal string. Provides a longer key length and is commonly used in modern applications and security-conscious environments.
SHA512
128-character hexadecimal string. Offers the longest key length for maximum uniqueness and security requirements.
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