SHA Hash Generator

Frequently asked questions

What is a cryptographic hash?

A hash function takes any input and produces a fixed-length string of characters. The same input always produces the same output, but the process cannot be reversed, and finding two different inputs that produce the same hash is computationally infeasible.

Can I reverse a SHA-256 hash back to the original text?

No. SHA-256 is a one-way function. It is not possible to reverse a hash to recover the original input. This is by design and is what makes hashes useful for verifying data integrity.

What is the difference between SHA-256 and SHA-512?

Both are part of the SHA-2 family. SHA-256 produces a 64-character hex digest and SHA-512 produces a 128-character digest. Both are considered secure. SHA-512 offers a larger output but is not meaningfully more secure for most use cases.

Is SHA-1 still safe to use?

SHA-1 is considered cryptographically broken for security-sensitive uses like digital signatures or certificates. It is shown here for compatibility verification only. Use SHA-256 or SHA-512 for any new security applications.

Does my input get sent to a server?

No. All hashing is performed by your browser itself using its built-in Web Crypto API — the same cryptography engine browsers use internally for HTTPS. No network request is made. Your text never leaves your device.