Repeat String Online — Multiply Text, Free
Repeat any string N times with optional separator. For test data, formatting, fillers. Browser-only.
About Repeat String
Repeating a string multiplies it by a chosen count, optionally separated by a delimiter. Useful for generating test data ("aaaa..."), creating dividers ("=====" × 60), padding strings, building progress bars in plain text, and producing fillers for layout tests. The ZTools Repeat String tool runs in the browser and handles up to a few million characters of output.
Use cases
- Generate stress-test inputs. A function should handle 10,000-char strings; generate "x" repeated 10,000 times to test.
- Build a divider line. "=" × 60 produces a visible separator for log files or terminal output.
- Pad a string to fixed width. Repeat space N times to pad an alignment.
- Pattern fillers for layout testing. "Lorem ipsum" repeated 50 times stress-tests text wrapping.
How it works
- Type the string. Any text including special characters and emoji.
- Set count. 1 to ~100,000 (browser memory caps higher).
- Optional separator. Empty (default), space, comma, newline, or custom string.
- Output. Concatenated result. Length displayed.
Examples
Input: "abc" × 5
Output: "abcabcabcabcabc" (15 chars).
Input: "=" × 60
Output: A 60-char divider line.
Input: "item" × 3 with separator ","
Output: "item,item,item".
Input: "\n" × 10
Output: 10 blank lines.
Frequently asked questions
Maximum length?
Browser allows ~100M chars in memory. Practical UI limit is ~1M for paste / display performance.
Unicode-safe?
Yes — emoji and multi-byte characters repeat correctly.
Difference from JavaScript .repeat()?
Same operation. Tool exposes it visually with separator option (which String.prototype.repeat doesn't have).
Privacy?
All in browser.
Pro tips
- For dividers, use repeat-with-separator-newline for vertical bars; repeat-no-separator for horizontal lines.
- For test inputs, generate at exact target length to test boundary cases (255, 256, 1024, 10000).
- For Unicode, count by code points if you need exactness — UTF-16 surrogate pairs can confuse "length".
Reviewed by Ahsan Mahmood · Last updated 2026-05-06 · Part of ZTools.
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