A tiny change, a completely different result
A hash function takes any input and produces a fixed-length string that acts as a fingerprint for that exact data. This tool computes four of the most common hash types directly inside your browser, using the same cryptographic engine browsers rely on for their own security features.
Try it yourself: the avalanche effect
Type "hello" into the box above and note the SHA-256 result, then change it to "Hello" — just one capitalized letter. The two hashes share nothing in common, even though the input barely changed. This is a deliberate, essential property called the avalanche effect: a well-designed hash function is built so that even a one-character difference produces a completely unrelated output, with no visible pattern connecting the two. It's exactly what makes hashes useful for detecting even the smallest alteration to a file or message.
Using it
Type or paste any text into the box, and all four hash types update instantly below it. Click the copy icon next to any result to grab that specific hash.
Choosing the right hash type
- SHA-256 / SHA-512 — the right choice for anything security-sensitive, still cryptographically strong and widely used.
- MD5 — fast and still common for basic file checksums, but not appropriate where security matters, since it's known to be vulnerable to deliberately engineered collisions.
- SHA-1 — similarly deprecated for security use, included mainly for compatibility with older tools.
Common uses
Verifying that a downloaded file matches its publisher's published checksum, generating a quick unique identifier for a piece of text, checking whether two files are byte-for-byte identical without comparing them directly, and testing code that itself works with hashes are common reasons people reach for a hash generator. In each case, the same input always produces the same hash — that determinism is what makes a hash useful as a fingerprint in the first place: hash the file again later, and if the result differs even slightly, you know something about it changed.
Pairs well with
Working with structured data? The site's JSON Formatter and CSV ⇄ JSON Converter are common companions when a hash is needed for a specific payload.
Frequently asked questions
+Is this hash generator really free, with no sign up?
Yes. There's no account and no limit on how many hashes you can generate.
+Which hash types are supported?
MD5, SHA-1, SHA-256, and SHA-512. The SHA family uses the browser's own built-in Web Crypto API, while MD5 uses a standard implementation, since browsers don't provide MD5 natively.
+Is my text sent anywhere to generate the hash?
No. Every hash is computed directly in your browser — nothing you type is ever uploaded or logged.
+Which hash type should I actually use?
SHA-256 or SHA-512 for anything security-related. MD5 and SHA-1 are both considered cryptographically broken for security purposes and are included mainly for compatibility with older systems or non-security uses like checksums.