Staaarter Tools

String Repeater

Repeats your text a chosen number of times, optionally joined by a separator, useful for generating test data, filler text, or repeated patterns. A free online tool from Staaarter, right in your browser.

Runs locallyUpdated 2026-07-22
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Overview

Introduction

Generating repeated text, for test data, filler content, or a repeated visual pattern, is quick with the right tool instead of copy-pasting by hand.

It runs entirely client-side, so nothing you paste is ever uploaded to a server.

What Is String Repeater?

A repeater that duplicates your input text a chosen number of times, optionally joined by a separator between each copy.

It runs entirely client-side as part of this site's String Tools collection, so nothing you paste is ever uploaded to a server.

How String Repeater Works

The tool builds an array of `count` copies of the input and joins them with the given separator (empty by default).

The transformation happens synchronously in JavaScript the moment you type, with no network round trip involved.

When To Use String Repeater

Use it to generate repeated test data, a filler pattern, or a visual divider made of repeated characters.

It's a fast way to get the answer without opening a code editor, a REPL, or writing a one-off script just to check.

Often used alongside Text Joiner and String Unigram Generator.

Features

Advantages

  • Supports an optional separator, not just plain concatenation.
  • Simple, predictable output.
  • Places the separator strictly between copies, so there is never a trailing separator to trim off the end.

Limitations

  • No support for randomizing or varying each repetition; every copy is identical.
  • Reproduces the text exactly each time, so there is no way to number the copies or vary them as they are generated.

Examples

Repeating with a separator

Input

ab

Output

ab-ab-ab

With count=3 and separator '-', three copies are joined by dashes.

Best Practices & Notes

Best Practices

  • Leave the separator blank for simple concatenation, like a repeated visual divider character.
  • Work out the resulting length before generating large amounts, since the output size is simply the input length multiplied by the count.
  • Put any needed line break into the separator when you want each copy to sit on its own line.

Developer Notes

The implementation is `Array(count).fill(input).join(separator)`, which handles a separator naturally by relying on Array.prototype.join() rather than a manual loop with conditional separator insertion.

String Repeater Use Cases

  • Generating repeated test data for a script
  • Creating a visual divider made of repeated characters
  • Building filler text of a specific repeated pattern

Common Mistakes

  • Expecting each repetition to vary; all copies are identical.
  • Adding the separator to the end of the input text as well, which produces a doubled separator between every copy.

Tips

  • Use a divider character with no separator to build a horizontal rule, like '-' repeated 40 times.
  • A count of 1 returns the text unchanged with no separator at all, which makes the count safe to drive from a variable that might legitimately be 1.

References

Frequently Asked Questions