Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes instantly, right in your browser.
This free hash generator computes MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text you enter. All calculations run locally in your browser using the Web Crypto API (for the SHA family) and a pure JavaScript implementation (for MD5) — your text is never uploaded or sent to any server, making it safe to hash sensitive strings for checksums, comparisons or testing.
Hashing is a one-way process: it takes an input of any length and produces a fixed-length string of characters that uniquely represents that input. The same input always produces the same hash, but even a tiny change to the input — a single character — produces a completely different hash, which makes hashes useful for verifying file integrity, detecting tampering, and comparing values without storing the original data.
Frequently Asked Questions
What is a hash function?
A hash function takes an input of any size and produces a fixed-length string of characters (the hash or digest) that uniquely represents that input. It is a one-way process — you cannot reverse a hash back to the original text.
What is the difference between MD5, SHA-1 and SHA-256?
They are different hashing algorithms producing different digest lengths and security levels. MD5 (128-bit) and SHA-1 (160-bit) are considered cryptographically broken for security purposes but remain common for checksums. SHA-256 (256-bit) and higher (SHA-384, SHA-512) are current, secure standards.
Is MD5 safe to use for passwords?
No. MD5 is fast and has known collision vulnerabilities, making it unsuitable for password storage. Passwords should use dedicated, slow algorithms designed for that purpose (like bcrypt or Argon2), not general-purpose hash functions.
Why does the same input always produce the same hash?
Hash functions are deterministic — given identical input, they always produce identical output. This is what makes them useful for verifying that two files or strings are exactly the same without comparing them byte by byte.
Can I reverse a hash back to the original text?
No, not directly. Hash functions are designed to be one-way. The only practical way to "reverse" a hash is to guess possible inputs and hash them to see if they match (a brute-force or dictionary attack), which is why short or common inputs are not safe to hash for security purposes.
Is my text sent to a server when I use this tool?
No. All hashing happens locally in your browser using JavaScript — nothing you type is ever transmitted anywhere.
What is a checksum used for?
A checksum (often a hash) lets you verify that a downloaded file has not been corrupted or tampered with, by comparing the hash you compute against the hash published by the file's source.
Why do MD5 and SHA-1 still get used if they are "broken"?
They are still fast and adequate for non-security purposes like detecting accidental data corruption or generating quick, non-sensitive unique identifiers, even though they should not be relied on for cryptographic security.
What does SHA stand for?
SHA stands for Secure Hash Algorithm, a family of cryptographic hash functions published by the U.S. National Institute of Standards and Technology (NIST).
Which hash should I use today for security purposes?
SHA-256 is the current widely recommended standard for most general security purposes, with SHA-384 and SHA-512 offering additional margin for applications requiring extra assurance.