API key generator. Generate cryptographically secure API keys in hex, base64, alphanumeric, and UUID v4 formats.
100% browser-based — your data never leaves your device
Generate cryptographically secure API keys in hex, base64, alphanumeric, and UUID formats.
51ab716c74714797fc72d72fc2475fae6cc72f8ab2b082afb03b6dfc7b7a312cb6e5b3be30ff7f27d266dbea44f82807f3b803d10462668e1a566cb545eb23f38e88bf5d73c6c92b190cc4f78298e821Decode and inspect JWT tokens instantly.
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API Key Generator is a free online security tool that generate cryptographically secure api keys in hex, base64, alphanumeric, and uuid formats. It works entirely in your browser — no downloads, no installations, and no server uploads required. security engineers, backend developers, system administrators use API Key Generator when they need a fast, privacy-respecting way to process security data without installing additional software. It supports capabilities such as multiple formats, cryptographically secure, configurable length. Additional features include bulk generation. Common use cases include generating api keys for web service authentication, creating secure tokens for application secrets and encryption keys, producing uuid-based identifiers for distributed systems. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes API Key Generator ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
API Key Generator is a free online security tool that helps you generate cryptographically secure api keys in hex, base64, alphanumeric, and uuid formats. Key capabilities include multiple formats, cryptographically secure, configurable length. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to generating api keys for web service authentication.
Select hex, base64, alphanumeric, or UUID v4 as your key format.
Adjust the key length (16-128 characters) using the slider.
Click Generate to produce secure keys. Copy individual keys or all at once.
| Category | Details |
|---|---|
| Input Limits | Maximum input size: Browser memory bound |
| Key sizes: 128–4096 bits (algorithm dependent) | |
| Supported Formats | Raw text, Hex, Base64, Binary, JWT / JWS / JWE |
| Browser Engine |
|
All operations run entirely in your browser using built-in Security APIs. No server uploads, no data storage, and no third-party requests.
API Key Generator is ideal when you need to generating api keys for web service authentication without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for command-line cryptographic operations, consider using OpenSSL CLI. For for enterprise secret management, HashiCorp Vault may be a better fit. API Key Generator fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. API Key Generator processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
Hex is most compatible (e.g., GitHub uses hex). Base64 is more compact. UUID v4 is standard for resource identifiers. Alphanumeric is human-friendly.
128 bits (32 hex chars) is sufficient for most APIs. For highly sensitive systems, use 256 bits (64 hex chars).
Generate keys in hex, base64, alphanumeric random strings, or UUID v4 format.
All keys are generated using crypto.getRandomValues() for true cryptographic randomness.
Adjust key length from 16 to 128 characters with a simple slider control.
Generate up to 50 keys at once with entropy information for each format.
API Key Generator is useful in a variety of scenarios across different workflows:
Generating API keys for web service authentication
Creating secure tokens for application secrets and encryption keys
Producing UUID-based identifiers for distributed systems
Hex keys are most compatible (used by GitHub and GitLab). Base64 is more compact. UUID v4 is standard for resource IDs. Alphanumeric is human-friendly.
Generate new API keys periodically and deprecate old ones. Use the bulk generation feature to create replacement keys for multiple services at once.
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