HashOnline Client-side tools

About HashOnline

HashOnline is a static web application for calculating hashes, checksums, message authentication codes, and key derivation outputs directly in your browser.

Who It Serves

Developers, release engineers, security reviewers, and technical users who need quick local hash calculations without setting up command-line tooling.

How It Runs

The site is generated with Astro and runs hash computations with WebAssembly and JavaScript libraries in the browser. Input data is not sent to a HashOnline server.

What It Covers

HashOnline includes SHA-2, SHA-3, Keccak, BLAKE, MD-family hashes, CRC checksums, HMAC, KMAC, and password-oriented KDFs such as Argon2id, bcrypt, and scrypt.

Local-First Design

Hashing often involves private source text, downloaded files, release artifacts, API signatures, or test vectors. HashOnline keeps the primary workflow local by using browser APIs instead of uploads.

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