How to Use the SHA-256 & MD5 Hash Generator
A hash function is a one-way function that converts input of any length into a fixed-length, unique-looking string. The same input always produces the same hash, changing even a single character produces a completely different result, and there's no way to reverse-engineer the original input from the hash alone. These properties make hashing useful for password storage, verifying file integrity, and detecting tampered data. This tool calculates both the SHA-256 and MD5 hash of whatever text you enter, at the same time.
MD5 is a 128-bit (32 hex character) hash algorithm from the 1990s that's fast to compute, but practical collision attacks — where two different inputs produce the same hash — have already been demonstrated, so it's no longer recommended for password storage or digital signatures. It's still widely used, however, for quickly confirming that a downloaded file matches the original. SHA-256 produces a 256-bit (64 hex character) hash, and no practical collision attack has been found to date, which is why it's become the standard in security-critical areas like blockchain (including Bitcoin), digital certificates, and file signing.
All hashing runs as JavaScript inside your browser, and neither your input text nor the resulting hash is ever transmitted to an external server. That makes it safe to use even when checking the hash of something sensitive, like a password or an API key.
Frequently Asked Questions
MD5 produces a 128-bit hash and is an older algorithm with known collision weaknesses, so it's not recommended for security purposes and is mainly used for quick file integrity checks. SHA-256 produces a 256-bit hash and has no practical collision attack known to date, making it the standard choice wherever security matters.
No. All hashing happens entirely inside your browser, and neither your input text nor the resulting hash is ever stored or transmitted anywhere.