Hash Generator

The Hash Generator is a free sha256 and checksum tool that computes SHA-256, SHA-384, SHA-512 and SHA-1 hashes from any text, entirely inside your browser using the native Web Crypto API — no server, no upload, no library to install. A hash is a fixed-length fingerprint of data: the same input always produces exactly the same hash, while changing even a single character produces a completely different, unpredictable result.

Developers use hashes constantly: verifying that a downloaded file matches its published checksum, generating stable cache keys from request parameters, deduplicating content without storing the original text, comparing two large values without transmitting either of them, and creating commit-like identifiers for arbitrary blobs of data. Security teams use SHA-256 hashes (often salted) to store password verifiers instead of plaintext passwords, and API providers use hashes for webhook signature verification. Git itself is built around SHA-1 (and increasingly SHA-256) object hashes, so understanding what a hash actually looks like for a given piece of text is directly useful when inspecting commit objects or troubleshooting a mismatched checksum in a package manager's lockfile.

SHA-256 is the modern, general-purpose default — fast, well-audited and collision-resistant for any realistic input size. SHA-384 and SHA-512 offer a larger digest for applications wanting extra margin. SHA-1 is included only for compatibility with legacy systems and older tooling; it has known collision weaknesses and should never be used for anything security-sensitive going forward. The avalanche effect is easy to see for yourself: hash 'hello' and then 'Hello' and compare the results — two completely unrelated-looking hashes despite the one-character difference, which is exactly the unpredictability a cryptographic hash function is designed to guarantee.

Because hashing runs locally via the Web Crypto API, results are computed instantly, even for large blocks of text, and your input is never transmitted anywhere — useful when the text you're hashing is itself sensitive.