Hash Generator (SHA-256)

This tool generates a cryptographic hash of any text using the SHA family of algorithms, including the widely used SHA-256, entirely in your browser. A hash is a fixed-length fingerprint of data: feed in any text, from a single word to a whole document, and the algorithm produces a string of hexadecimal characters that is unique to that exact input. Change even one character and the hash changes completely and unpredictably, which is what makes hashes so useful. They are used to verify that a file or message has not been altered, to store passwords safely without keeping the original, to index and deduplicate data, and as the backbone of digital signatures and blockchains. The SHA-256 algorithm, which produces a 256-bit hash, is the standard choice for most modern applications, balancing strong security with wide support. This tool lets you generate a hash in seconds. You type or paste your text and choose the algorithm, SHA-1, SHA-256, SHA-384 or SHA-512, and the calculator returns the hash as a hexadecimal string, ready to copy. It uses the browser's built-in Web Crypto API, the same vetted cryptography used across the web, and everything runs locally so your text is never uploaded, which matters when hashing anything sensitive. The result updates as you type. Use it to verify a download against a published checksum, to generate a fingerprint of some data, to learn how hashing behaves, or for development and testing. A crucial point: hashing is one-way. You cannot reverse a hash back to the original text, which is exactly why it is used for integrity checks and password storage. Note that SHA-1 is now considered weak and is best avoided for security.

Uses the browser's Web Crypto API. Hashing is one-way and cannot be reversed. Runs entirely in your browser; nothing is uploaded. Avoid SHA-1 for security.