Random String Generator Online — Free API Key Generator
Generate random strings for passwords, API keys, tokens online for free. Custom length, charset, exclude ambiguous chars. No signup, instant.
Generate random strings for passwords, API keys, tokens, and test data. Customize length, character set, and format.
How to use Random String Generator Online — Free API Key Generator
- Set the string length.
- Choose character sets: lowercase, uppercase, digits, symbols.
- Click Generate.
- Copy the random string.
Features
- Customizable length (1 to 10,000 characters).
- Selectable character sets.
- Optional exclusion of ambiguous characters (0, O, l, 1).
- Batch generation available.
FAQ
Is this random enough for passwords?
Yes. The tool uses crypto.getRandomValues(), which is a cryptographically secure random number generator. The output is suitable for passwords, API keys, and tokens. For maximum security, use at least 16 characters with all character sets enabled.
What is the difference between random and pseudorandom?
True random uses physical phenomena (radioactive decay, electronic noise). Pseudorandom uses mathematical algorithms. crypto.getRandomValues() uses OS-level entropy, which is effectively true random for practical purposes. JavaScript's Math.random() is pseudorandom and not suitable for security.
How long should an API key be?
32 characters is standard for API keys. 16 characters is the minimum for moderate security. 64 characters for high-security applications. Use a mix of uppercase, lowercase, and digits. Avoid symbols in API keys as they can cause URL encoding issues.