How to generate random strings with custom length and character types

What you can generate

Random String is useful when you need sample identifiers, test values, short placeholders, or batches of generated text. You can choose how long each string should be, how many strings to create, which character pool to use, and how letters should be capitalized. Supported pools include hexadecimal characters, digits, letters, alphanumeric characters, and a base64-style set containing letters, digits, plus, and slash.

The tool can generate one or more strings and returns the generated values with related generation metadata. Since each position is filled through a random character choice, running the same settings again can produce different values. Treat the output as generated data for your task, not as a guarantee of a particular value or of uniqueness across a batch.

How to generate random strings

1. Open the Random String tool.
2. Set the length for each string. The requested value is converted to an integer and constrained to a range from 1 through 256.
3. Set the number of strings to generate. The requested count is converted to an integer and constrained to a range from 1 through 50.
4. Choose a character pool: hexadecimal, digits, letters, alphanumeric, or the base64-style option.
5. If you choose letters or alphanumeric characters, select mixed case, uppercase, or lowercase. This case choice does not change digits-only, hexadecimal, or base64-style output.
6. Run the generator and review the returned strings.

If you leave the options unsupplied, the tool generates one alphanumeric string with a length of 16 and mixed letter case. If the length or count cannot be converted from the supplied value, both settings revert to a length of 16 and a count of 1.

How to read the result

The successful result contains the requested number of generated strings, and each string uses the normalized length. For example, a requested length above the supported range is handled as 256, while a requested count above its supported range is handled as 50. The returned values may differ between generations because characters are selected randomly for each position.

Check the pool and case setting before using the output. A digits-only pool will not gain letters from a case selection, and a hexadecimal or base64-style pool follows its own supported character set. The tool does not guarantee that several generated strings will be unique or that a particular value will appear. The available product facts also do not establish how generated values are stored, transmitted, retained, or handled privately.

Worked example

A QA tester needs three 12-character numeric samples for form testing.

Choose a length of 12, set the count to 3, select the digits character pool, and run the generator.

The result should contain three generated strings, with each string using 12 characters selected from the digits pool.

Limitations

• Generated values are random selections, so a particular value is not guaranteed.
• The reviewed behavior does not guarantee that multiple generated strings are unique.
• The declared network setting is false, but that fact does not establish the tool's deployment environment or how generated values are handled.

Common errors

• If the length or count input is invalid or unsuitable for conversion, both settings return to a length of 16 and a count of 1. Enter numeric values within the supported ranges and check the result dimensions before continuing.

FAQ

Can I generate strings made only of digits?

Yes. Choose the digits pool and set the desired length and count. The case control does not change digits-only output.

How many random strings can I generate at once?

You can request up to 50 strings, and each requested length is constrained to a range from 1 through 256. The successful result contains the normalized number of strings at the normalized length.

Are the generated strings guaranteed to be unique?

The tool does not guarantee unique values. Random selection can produce different results on separate generations, but a batch is not promised to contain no duplicates.