Is this the same as openssl rand -hex 32?

Yes. With 32 bytes you get a 64-character lowercase hex string from a cryptographically secure random source, exactly like openssl rand -hex 32.

Is the generated key sent to a server?

No. The key is generated locally in your browser with crypto.getRandomValues. Nothing is transmitted or stored.

How many bytes should I use?

32 bytes (256 bits) is a common default for secret keys. Use 16 bytes for 128-bit tokens.

Techvoyage

Secret Key Hex Generator

Generate a cryptographically secure secret key as hex bytes in the browser. Equivalent to openssl rand -hex N.

Bytes

Generated client-side using the browser's Web Crypto API. Equivalent to openssl rand -hex N.

About this tool

This tool generates cryptographically secure random bytes with your browser's Web Crypto API and encodes them as a lowercase hex string — the browser equivalent of the openssl rand -hex command. Use it for secret keys, tokens, and API credentials. Everything runs locally in your browser.

FAQ

Is this the same as openssl rand -hex 32?: Yes. With 32 bytes you get a 64-character lowercase hex string from a cryptographically secure random source, exactly like openssl rand -hex 32.
Is the generated key sent to a server?: No. The key is generated locally in your browser with crypto.getRandomValues. Nothing is transmitted or stored.
How many bytes should I use?: 32 bytes (256 bits) is a common default for secret keys. Use 16 bytes for 128-bit tokens.