Random String Generator
Generate random strings with custom rules
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
Options
mDMEF4DRaaeL5Y4TIe44HlH9hlfIEgHqAsQ35EGb1IdUu5yxOlYBnlXzHhOLTGuze0x2vB7RnKOodEOLfBVWQfVCltHLsjMbqLfQV3GtvDjPF57CzyrtHRV5T5h2sdmIHVhjlGzV0TpgjHvBvEaWwfQv7dFcvgQSAbout this tool
Generate random strings of text based on rules you set - length, character set (letters, numbers, symbols), useful for things like generating API keys, temporary identifiers, test data, or any situation where you need unpredictable random text that isn't specifically a password.
How to use this tool
- Choose character setSelect letters, digits, symbols, or custom combinations based on intended usage.
- Set string lengthDefine output length according to token policy or system constraints.
- Generate random outputCreate one or multiple cryptographically random strings instantly.
- Copy and use safelyStore generated values in secure vaults/configs where needed.
How long should a random string be?
For tokens and secrets, aim for at least 128 bits of randomness: about 22 characters using letters and digits, or 32 hex characters. For human-facing codes such as coupons or invite codes, 8 to 12 characters is usually enough, as long as you limit how many guesses someone can make.
Leave out look-alike characters such as 0 and O or 1, l and I when people will read and type the code.
Key features
- Generates unpredictable values for technical and security workflows.
- Flexible character controls support multiple token formats.
- Useful for test data, IDs, invite codes, and temporary secrets.
- Faster and safer than manual random text creation.
Common uses
- Creating API keys and temporary access tokens.
- Generating unique identifiers for test fixtures.
- Producing random coupon/invite strings for apps.
- Building sample data for QA and automation scripts.
Tips for better results
- Use longer lengths for security-critical tokens.
- Avoid ambiguous characters when humans must type values manually.
- Store generated secrets in environment managers, not plain docs.
- Regenerate tokens regularly for short-lived access use cases.
Mistakes to avoid
- Using short strings for high-value authentication tokens.
- Copy-pasting secrets into insecure chat/email channels.
- Reusing same generated token across multiple environments.
- Confusing random IDs with cryptographic passwords.
Frequently asked questions
The Password Generator is specifically tuned for creating strong login passwords. This tool is more general-purpose - useful for generating random strings for API keys, test IDs, or other non-password uses with flexible character set rules.
If the tool offers that option, excluding easily-confused characters can help when the string needs to be manually typed or read aloud, reducing transcription errors.
Good random string generators use a cryptographically secure random source, meaning the output is unpredictable and suitable even for security-sensitive uses like generating tokens or keys.
For unguessable tokens such as reset links or API keys, use at least 128 bits of randomness - about 22 characters from letters and digits, or 32 hex characters.
Letters and digits work everywhere. Add symbols only where the target system accepts them, and use URL-safe characters (letters, digits, - and _) for anything that goes into a link.
Coupon and voucher codes, test data, file names, temporary IDs, invite codes and salts. For codes people type by hand, exclude look-alike characters such as 0 and O.