Is the generated token secure?

This tool uses the browser's built-in crypto.getRandomValues() API to generate random numbers. This is a cryptographically secure pseudo-random number generator (CSPRNG). All generation is done entirely locally in your browser and is never uploaded to any server.

How secure is UUID v4?

UUID v4 uses 122 bits of random entropy. The theoretical collision probability is about 2^61 (birthday attack). This is sufficiently secure for most application scenarios (such as database primary keys and session identifiers). For tokens requiring higher security, we recommend using longer Hex or Alphanumeric formats.

How long should a token be?

It depends on the use case. API Keys are typically 32-64 characters, session tokens are recommended to be 64+ characters, and one-time verification codes can be 6-8 digits. Generally, longer tokens provide higher security. A 32-character alphanumeric token provides approximately 190 bits of entropy, which is sufficient for most security needs.

Will batch-generated tokens have duplicates?

There is a theoretical, extremely small probability of duplicates, but in practice it is virtually impossible. For example, generating 100 32-character alphanumeric tokens has a collision probability far below 10^-40. If your application requires extremely high uniqueness guarantees, we recommend performing uniqueness checks during usage.

Token Generator

Random Token / API Key Generator

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Token Generator Usage Guide

Token Types

UUID v4 - Standard UUID format, e.g. 550e8400-e29b-41d4-a716-446655440000
Hex - Pure hexadecimal characters (0-9, a-f)
Alphanumeric - Uppercase and lowercase letters plus digits
Base64 - URL-safe Base64 encoded string
API Key - Custom-prefixed API key format

Use Cases

Generate API keys and access tokens
Create session identifiers
Generate password reset tokens
Database unique identifiers
One-time verification codes

Token Generator

Token Generator Usage Guide

Token Types

Use Cases

常见问题

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