Random String / API Key Generator

Generate cryptographically secure random strings, API keys, and tokens with custom character sets, prefixes, group separators, and bulk output. Runs in your browser using the Web Crypto API.

100% client-side. Your data never leaves your browser.

62 characters

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Converters & Examples

Generate Bulk Session Tokens for Development

Generate multiple cryptographically secure session tokens at once using base64url charset. Perfect for seeding test databases, populating dev environments, or load testing.

 Generate UUID-like Hex IDs for Database Records

Create hex strings in UUID format (8-4-4-4-12) for database primary keys, event IDs, and distributed system identifiers. 128 bits of randomness per ID.

 Generate OpenAI API Key: Create Test Keys with Correct Format

Generate an OpenAI-format API key with sk- prefix, correct length, and alphanumeric charset. Create test keys for development without touching your real quota.

 Generate Readable Coupon Codes for Promotions

Create human-friendly coupon codes using uppercase letters and numbers with grouping. Excludes ambiguous characters for easy manual entry over phone or chat.

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Random String / API Key Generator

Generate random strings for API keys, tokens, session secrets, and identifiers with full control over character sets and formatting. All randomness comes from the Web Crypto API. Nothing is sent to a server.

How to Use

  1. Select a character set preset or choose Custom to type your own characters
  2. Set the length and how many strings to generate (up to 100)
  3. Optionally set a prefix (e.g., sk-), suffix (e.g., ==), or API key format preset
  4. Use grouping to insert separators every N characters for readability
  5. Click Generate or press Enter
  6. Copy individual strings or all at once

Common Use Cases

API Keys for Development

Generate test API keys with realistic prefixes. OpenAI uses sk- followed by 51 alphanumeric characters. GitHub PATs start with ghp_. Stripe live keys start with sk_live_. The presets handle these automatically.

Session Tokens

Use the Base64 URL-safe charset for tokens that need to work in URLs and HTTP headers without encoding issues. The charset avoids characters that cause problems in different contexts.

Hex Strings for IDs

Hex strings are useful for database IDs, color codes, and cryptographic nonces. Use hex-lower for case-insensitive contexts or hex-upper for density (no lowercase extends character recognition).

Technical Identifiers

Custom charsets let you exclude easily confused characters. For example, if you want only consonants (no vowels to avoid accidental words), type them directly into the custom field.

Why Character Set Size Matters

The number of possible strings grows exponentially with both length and character set size. A 32-character alphanumeric string (62 characters) has roughly 190 bits of entropy, equivalent to a 192-bit key. A 32-character hex string (16 characters) has 128 bits, still well above current brute force thresholds.