Random String Dataset Generator

Runs in browser Test Data

Thousands of strings at once — fixed or variable length, alphanumeric, with symbols, whitespace-only, empty, very long — exported as JSON, CSV or lines.

TEST DATA ONLY — all generated names, contacts, identifiers and numbers are synthetic and do not belong to real people or accounts.
Privacy: This tool runs entirely in your browser. Your input never leaves your device.

How to use Random String Dataset Generator

  1. Set the length range and alphabet, or a pattern.
  2. Enable edge cases or uniqueness if needed.
  3. Press Generate and export.

Random String Dataset Generator features

  • Up to 1,000 strings with fixed or variable length (0–10,000 characters)
  • Alphabets: alphanumeric, letters, case-specific, digits, hex, symbols, printable ASCII, mixed Unicode scripts or custom characters
  • Mask patterns (AAA-999-aa) with escapes
  • Edge cases: empty, whitespace, padded, null/undefined words, NBSP, 255/256/10,000 characters
  • Unique-value mode and per-row length and byte counts
  • One-per-line, JSON, CSV, SQL, XML or JSON Lines output

Random String Dataset Generator example

Licence-key style strings

Input:

Pattern: AAAA-9999-AAAA · Strings: 3

Output:

DWPQ-2091-AHXK
NXKB-1763-QWER
XXYA-5900-AZMT

Frequently asked questions about Random String Dataset Generator

What alphabets are available?

Alphanumeric, letters, lower/upper case, digits, hex, symbols, all printable ASCII, a mixed-script Unicode pool or your own characters.

How do patterns work?

A mask such as AAA-999-aa where A is uppercase, a lowercase, 9 a digit, # alphanumeric, ? a symbol and * any ASCII character; use a backslash to keep a literal.

Which edge cases can be added?

Empty string, whitespace-only, leading/trailing spaces, the words null/undefined/true, non-breaking and ideographic spaces, and 255/256/10,000-character strings.