Generate random strings with your choice of characters for passwords, tokens, and more.
Generated strings
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Click Generate to create random strings
Uses cryptographically secure random generation (crypto.getRandomValues). Max 100 strings per generation.
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What is the Random String Generator?
A random string generator is a tool that produces sequences of characters with no predictable pattern. It combines letters, numbers, symbols, or custom character sets to create strings of any length. Unlike human-typed passwords, algorithmically generated strings have no bias and are far harder to guess or crack.
How it works
The tool uses a pseudorandom number generator seeded by system entropy to pick characters from your chosen set (uppercase, lowercase, digits, symbols) and arranges them in random order. Each character position is selected independently, so no pattern repeats. The longer the string and the larger the character set, the higher the entropy—making it exponentially harder to break.
A strong password candidate with 94-character set; ~106 bits of entropy
Length: 32, Include: uppercase, lowercase, digits only
aB7cDe9fGh2iJkLm3nOpQrS4tUvWxYz5
A token or API key for systems that reject special characters
Length: 8, Include: digits only
49736281
A PIN or OTP backup code (8-digit entropy ~26 bits, weaker—use longer for real security)
How to use the Random String Generator
Choose your desired string length (8 to 256 characters)
Select which character types to include: uppercase letters, lowercase letters, digits, symbols, or a custom set
Click 'Generate' to produce a random string instantly
Copy the result with one click or regenerate for another option
Repeat as needed to create multiple strings
Benefits
No human bias—true randomness is harder to predict than user-invented passwords
Instant generation for unlimited strings without download or installation
Fully customizable: mix character sets, set exact length, exclude confusing characters
Safe for sensitive use—no data is sent to servers or logged
Works for passwords, API keys, session tokens, unique IDs, and security codes
Tips & common mistakes
Common mistakes
Using only lowercase or only digits—limits entropy and makes strings easier to crack
Copying the same string into multiple accounts—if one is breached, all are at risk
Trusting browser autofill suggestions over a proper generator—they may not have enough entropy
Using a string shorter than 12 characters for a password—most modern attacks can crack in hours
Tips
For passwords, use at least 16 characters and include all four character types (upper, lower, digit, symbol) to reach ~80 bits of entropy
Store generated passwords in a password manager (Bitwarden, 1Password, KeePass) rather than retyping or writing them down
For API tokens or database seeds, 32 characters with uppercase, lowercase, and digits is a practical baseline
If you need to exclude ambiguous characters (0/O, 1/l, 5/S), many generators offer a 'no lookalikes' option
Frequently asked questions
Is a generated random string really secure?
Yes, if it has enough entropy (length and character-set diversity). A 16-character string from uppercase, lowercase, digits, and symbols has ~94 bits of entropy—secure against brute force. Shorter or single-case strings are weaker. The randomness itself is only as good as your tool's entropy source; this generator uses browser/system randomness.
Can I use this for passwords, API keys, and usernames?
Passwords: yes. API keys: yes. Usernames: only if the system accepts the character set (spaces and symbols often aren't allowed in usernames). Check your service's requirements first.
Is there a limit to how long a string can be?
Most generators support up to 256 characters. For practical use, 16–32 characters is typical for passwords and tokens. Longer strings don't add proportional security gain once you exceed 16–20 characters against modern attacks.
What if I need a string without special characters?
Uncheck the 'Symbols' option and select only uppercase, lowercase, and digits. The tool will generate from a 62-character set (A–Z, a–z, 0–9) instead of 94.
Can I regenerate the same string?
No—by design, each generation is independent and random. If you need the same string again, copy and save it elsewhere (password manager, notes, environment file).
Is my string logged or stored by FreeTooz?
No. This generator runs entirely in your browser. Your strings are never sent to a server or kept in logs. Close the tab and it's gone.