Produce cryptographic random bytes

Developers and security teams use Secure random bytes when preparing a check, a local test or integration data.

Produce cryptographic random bytes, then keep the result ready for your test or integration. Use it for free in your browser, with no account required.

How to use

Open the tool page in your browser and locate the field for the number of bytes.
Enter how many bytes you need, then start the generation.
Read the value shown in the result area and copy the byte sequence if it suits your purpose.
Use the erase action when you no longer want the generated value visible on screen.
Run the generator again whenever you need a fresh sequence; each run creates a new value.

Example

A developer setting up a local test environment needs a random salt for a hashing routine. They request a short byte sequence, copy it into the test configuration, and then erase the displayed result so no value stays visible on the screen.

Limits and formats

The tool returns raw bytes, not a ready-made password, passphrase or recovery phrase.
It does not choose an encoding for you, so converting bytes to hexadecimal, Base64 or text is a separate step.
Randomness depends on the cryptographic generator available in the browser and on the device running it.
Check the requested length before pasting the value into a production system or configuration file.
Do not leave a secret visible on screen longer than necessary, even though processing is local.

Where processing happens

Everything runs inside your browser. The generation happens locally on your device, and the byte sequence is not uploaded or shared outside. Copy the value before leaving the page, and run the generator again if you need a fresh sequence.

Frequently asked questions

What are secure random bytes used for?

They help create unpredictable values for tests, salts, identifiers and technical secrets. Because they come from the browser's cryptographic generator, they are a better choice than ordinary random numbers when unpredictability matters.

Can I pick the output format for the bytes?

No. You only set a number of bytes, and the tool displays a raw byte sequence. If you need hexadecimal, Base64 or readable text, convert the result with a tool designed for that encoding step.

Is the generated value saved anywhere?

No. The generation stays in your browser and the tool does not keep the value for you. Copy it before closing or erasing the page, otherwise you will need to generate a new sequence.