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Hash Generator

Produce MD5, SHA-1, SHA-256 and SHA-512 hashes from any text — all computed locally in your browser.

Free4 algorithmsNo upload
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How it works

A compact workflow from input to download.

1

Enter your text

Type or paste whatever you want to hash.

2

Read the hashes

MD5, SHA-1, SHA-256 and SHA-512 are all computed at once so you can compare them.

3

Copy what you need

Copy any individual hash to your clipboard.

Frequently asked questions

Can a hash be reversed?
No. A hash is a one-way function — it destroys information deliberately, mapping input of any length onto a fixed-size output. What an attacker can do is guess: hash billions of candidate inputs and compare. That is why hashing a common password offers so little protection, and why the answer is a slow, salted algorithm rather than a fast general-purpose one.
Is MD5 safe to use?
Not for anything security-related. MD5 is comprehensively broken — collisions can be produced in seconds on a laptop, meaning two different inputs can be made to share a hash. It survives only as a fast, non-security checksum for detecting accidental corruption, and even there SHA-256 is a better default.
Which algorithm should I use?
SHA-256 for general purposes — it is fast, widely supported and has no known practical weaknesses. For hashing passwords specifically, none of these are appropriate: use bcrypt, scrypt or Argon2, which are deliberately slow and salted, making mass guessing prohibitively expensive.
Why do the same words always give the same hash?
Because hash functions are deterministic — that is the entire point. It means you can verify that a file or a message has not changed by comparing its hash against a known value, without needing the original to compare byte by byte.
Is my data sent to a server?
No. Everything runs in JavaScript inside your own browser tab — nothing is uploaded, logged or stored. That is what makes it safe to paste in API responses, config files, tokens and other material you could not send to a third-party service.

What a hash function guarantees

A cryptographic hash makes three promises. It is deterministic: the same input always produces the same output, which is what makes verification possible. It exhibits the avalanche effect: changing a single bit of the input changes roughly half the bits of the output, so there is no way to nudge an input towards a target hash incrementally. And it is one-way: given a hash, there is no feasible route back to the input other than guessing. Those three properties together are what let you verify a download's integrity, detect whether a file has been tampered with, index content by its own fingerprint, and confirm a password without ever storing it — all without needing to keep the original data at all.

Why passwords need a different kind of hash

MD5 and SHA-256 are designed to be fast, and for password storage that is precisely the wrong property. A modern GPU can compute billions of SHA-256 hashes per second, so an attacker holding a stolen database of fast-hashed passwords can simply grind through every common password, every dictionary word and every leaked password from previous breaches, comparing as they go. Password hashing algorithms invert the design goal: bcrypt, scrypt and Argon2 are deliberately, tunably slow, and they take a random salt for each password so identical passwords do not produce identical hashes and precomputed rainbow tables are useless. A tenth of a second to check one login is imperceptible to your user and utterly ruinous to an attacker trying billions of guesses.

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