Random String Generator
Create reproducible strings of a chosen length using letters, alphanumeric characters, or hexadecimal digits.
Also known as: random text · character string
seeded · synthetic data
Presets
Output
About this tool, tips & examples
What it does
The Random String Generator produces seeded random strings from common alphabets — letters only, alphanumeric, or hexadecimal — at any length from 1 to 1,000 characters, up to 1,000 strings per run. It’s the plain workhorse for string fixtures: no formats, no semantics, just reproducible character data.
Common use cases
- Test fixtures — string columns, keys, and payload fields at exactly the lengths your schema allows (presets for letters, hex, and bulk).
- Placeholder values — opaque identifiers and codes for demos.
- Parser and validation tests — controlled-alphabet input for length limits, charset checks, and normalization.
- Load-test payloads — bulk strings of a precise size for bandwidth and storage testing.
Settings
- Alphabet — letters, alphanumeric, or hexadecimal.
- Length — 1 to 1,000 characters per string.
- How many — 1 to 1,000 strings, exportable as text, CSV, or JSON.
- Seed — identical seed + settings = identical strings.
Privacy note
Strings are generated locally in your browser and never uploaded. Seeded means reproducible — never use these as passwords, tokens, or secrets. The Password and Secure Token generators exist for that and draw from crypto randomness.
FAQ
Which alphabet should I pick? Match the field under test: hex for digest-and-ID-shaped values, alphanumeric for codes and slugs, letters for name-like text. For hostile input (Unicode, emoji, RTL), use Edge Case Strings instead.
How do I test a length limit of exactly 255? Generate strings at 254, 255, and 256 — the boundary trio that catches most off-by-one truncation bugs.
Need a specific pattern? The Regex String generator produces strings matching a regular expression — the precision tool when shape matters, not just length and alphabet.