Random String Generator Online — Free
Runs 100% in your browser — your files never leave your device.
Promo codes, placeholder data, test fixtures, giveaway entries — sometimes you just need random characters. Pick the length, choose letters, digits, hexadecimal, binary, or define your own character set, and generate. Need something secret-grade? The token generator draws from the cryptographic random source instead.
How it works
- 1
Set the length
From 1 to 10,000 characters.
- 2
Pick the characters
Letters, digits, alphanumeric, hex, binary — or type a custom set.
- 3
Generate and copy
One click generates; another copies the result.
About this tool
Random strings built to spec
The tool generates random strings of your chosen length from the character groups you select — lowercase, uppercase, digits, and symbols — with each character drawn independently from browser randomness. Test identifiers, sample tokens, bulk test data: any random text shape.
Strings versus passwords versus tokens
Same randomness, different purposes: as passwords they protect accounts, as tokens they carry cryptographic weight, and as plain random strings they fill test data and samples. Pick the page that matches the job — the guarantees differ in framing.
Length and alphabet
Security and uniqueness scale with length times alphabet size: a 16-character string from a 62-character alphabet has more combinations than atoms in a glass of water. Shorter strings suit test data; anything with trust attached deserves full length.
Frequently asked questions
Can I exclude lookalike characters?
Yes — the ambiguous-character option skips l, 1, I, O, and 0 for strings a human will transcribe. Machine-consumed strings can keep the full alphabet.
How random is the output?
Every character is drawn independently from your browser's random generator — uniform across the selected alphabet, pattern-free.
Can I generate many strings at once?
Yes — set a batch count and receive that many independent strings, each drawn separately.