Random String Generator

Generate random strings of any length from letters, numbers, symbols, or custom characters.


  

  

    

      
      
    

    

      
      
    

  

  

    
    
    
    
    
  

  

    
    
    
If filled in, only these characters are used and the checkboxes above are ignored.

  

  

    
    
  

  


    

    

      
ToolsSoup's Random String Generator creates random strings of any length right in your browser. Choose which characters to include — uppercase, lowercase, numbers, and symbols — or supply your own custom alphabet, set the length, and generate one or hundreds of strings at once. Everything runs locally using your device's cryptographically secure random generator, so nothing you create is ever sent to a server, logged, or stored.

      

        
What is a random string generator?

        
A random string generator is a tool that produces unpredictable sequences of characters from a chosen alphabet. It is handy for creating unique identifiers, API keys, tokens, test data, temporary codes, file names, and placeholder values. This tool uses the Web Crypto API (crypto.getRandomValues), the same cryptographically secure source browsers use for encryption, with rejection sampling so every character is drawn without bias.

        
      

      

        
How to generate random strings

        
Generating random strings takes only a few seconds:

        
  1. Set the length to the number of characters you want in each string.
  2. Choose the character types to include: uppercase, lowercase, numbers, and symbols.
  3. Optionally exclude look-alike characters such as l, 1, I, O, and 0 to avoid confusion.
  4. Or type your own custom characters to build strings from an exact alphabet.
  5. Pick how many strings to create, click Generate, and copy the results in one click.

      

      

        
Using custom characters

        
Leave the checkboxes for the standard sets, or enter your own characters in the custom field to control the alphabet exactly. When the custom field has any value, only those characters are used and the checkboxes are ignored. Duplicate characters are removed automatically, so you can paste in a set like 0123456789ABCDEF to generate, for example, random hexadecimal strings.

        
      

      

        
Why use this random string generator?

        
  • 100% free with no ads, sign-up, or usage limits.
  • Runs entirely in your browser — generated strings are never uploaded or stored.
  • Uses the cryptographically secure Web Crypto API, not Math.random().
  • Mix uppercase, lowercase, numbers, and symbols, or supply a custom alphabet.
  • Exclude look-alike characters to avoid confusion when reading or typing.
  • Generate up to 500 strings at once and copy them all in one click.

      

      

        
Frequently asked questions

        

          
Are the strings truly random?

          
Yes. The generator uses crypto.getRandomValues, the same cryptographically secure randomness browsers use for encryption keys, and applies rejection sampling so each character is unbiased.

        

        

          
Can I generate hexadecimal or other custom strings?

          
Yes. Type the exact characters you want into the custom characters field — for example 0123456789ABCDEF for hex — and the generator will build strings using only that alphabet.

        

        

          
What can I use random strings for?

          
Common uses include unique IDs, API keys and tokens, test or sample data, temporary passwords and codes, random file names, and placeholder content.

        

        

          
How long can the strings be?

          
You can generate strings from 1 up to 1024 characters each, and create up to 500 strings at a time.

        

        

          
Is anything sent to a server?

          
No. Everything is generated locally in your browser. Nothing you create is uploaded, logged, or stored, so the strings stay private to your device.