webutilkit

Hash Generator

Compute a SHA-1, SHA-256, SHA-384 or SHA-512 hash of text using the Web Crypto API, in your browser.

SHA-256
How it works


The text is encoded as UTF-8 bytes and passed to crypto.subtle.digest, the
browser’s built-in implementation of these hash functions. The result is a
fixed-length fingerprint of the input, shown here as hexadecimal.


Hashing is one-way


A hash cannot be reversed back into the original text. The same input always
produces the same hash, and changing even one character produces a
completely different one — which is what makes hashes useful for verifying
that a file or message has not been altered.


Choosing an algorithm


SHA-256 is the standard default: fast, widely supported, and with no known
practical attacks. SHA-384 and SHA-512 produce longer digests for a larger
security margin. SHA-1 is included only for compatibility with older
systems — it should not be relied on for security, since practical collision
attacks against it are known.
Frequently asked questions
Is my text sent anywhere?
No. The hash is computed locally using the browser’s built-in Web Crypto API; nothing is uploaded.
Which algorithm should I use?
SHA-256 is the common default for checksums and general use. SHA-1 is offered for compatibility with older systems only — it is considered broken for security purposes because of known collision attacks.
Why is MD5 not an option?
The Web Crypto API does not implement MD5, because it has long been considered cryptographically broken. If you need MD5 for legacy compatibility, it requires a separate library.