Hash Generator
Compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 for any text at once, then compare a known hash to see which algorithm matches — free, in your browser.
Compare with a hash
🔒 Your code never leaves the browser — not one character is sent anywhere, and nothing is stored
How to use it
- Type or paste your textAll five algorithms compute instantly, in any language.
- Copy any hash you needA separate copy button sits under each algorithm.
- Or compare with a hash you havePaste it into the second box to find out which algorithm matches, if any does.
- Make sure the text matches character for characterThe smallest difference — even a space — changes all five algorithms completely.
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Frequently Asked Questions
MD5 and SHA-1 are known to be "broken" — why include them at all?
Broken for security — meaning they’re unfit for passwords or digital signatures, because known methods can craft collisions (two different inputs producing the same hash). But they still have plenty of legitimate uses that don’t need that level of security: verifying the integrity of a downloaded file (checksums), cache keys, or legacy systems that require them. We generate them because they’re genuinely needed, and we say plainly where they don’t belong.
Can you reverse a hash back to the original text?
No — and that’s the fundamental difference between a hash and Base64. Base64 is reversible encoding: anyone can decode it back to the original. A hash is one-way by design: a mathematical function maps any text (however long) onto a fixed-length fingerprint, and no method exists to go from the fingerprint back to the input. That’s exactly what makes hashes useful for verifying equality without exposing the content itself.
I’m sure I copied the same text, but the hash is completely different. Why?
The slightest difference — an extra space, a newline, a capital instead of a lowercase letter — changes the hash entirely, not just in the affected region. That’s deliberate behavior in every hash algorithm (called the avalanche effect), designed so nobody can infer the original from partial similarity. Make sure the text matches character for character, including leading and trailing spaces.
What does the "Compare with a hash" box do?
You paste a hash you already have (from a download page, say) and we check it against the five computed for your current text — matching the full value, not just the length (SHA-256 and several others produce the exact same length). If it matches one of them, we tell you which; if none match, we say so plainly instead of guessing.
Which algorithm should I use today?
SHA-256 is the sensible default for most modern uses — fast, with no known collisions and support almost everywhere. SHA-384 and SHA-512 are stronger but slightly slower with longer digests. Use MD5 or SHA-1 only when a legacy system forces them on you explicitly, not by choice.
Is the text or the hash uploaded to a server?
No, not a single character. Computing and comparing happen entirely inside your browser.