BracketHash Generator — MD5, SHA-1, SHA-256, SHA-512
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text instantly. Runs entirely in your browser using the Web Crypto API — nothing you type is ever sent anywhere.
🔒 Runs entirely in your browser — no data is ever sent anywhereWhen you need to generate a hash
A cryptographic hash gives you a short, fixed-length fingerprint of arbitrary data — useful whenever you need to verify two things are identical without comparing them byte-for-byte, or without transferring the whole thing at all. Checking a downloaded file's SHA-256 against the one published by its source confirms it wasn't corrupted or tampered with in transit; hashing a string is also a common way to generate a stable cache-busting key or a deduplication fingerprint for otherwise-large content.
MD5, SHA-1, SHA-256, SHA-512 — which one to use
All four are generated here using the browser's native Web Crypto API (crypto.subtle.digest), entirely client-side. MD5 and SHA-1 are both cryptographically broken for security purposes — collisions (two different inputs producing the same hash) can be deliberately engineered — but they're still common for non-security uses like file-integrity checksums, which is why they're included. SHA-256 is the current practical standard wherever security actually matters; SHA-512 offers a larger security margin at a small performance cost. Hashing is a one-way function by design: there's no way to reverse a hash back into the original input, which is also why hashing alone (without salting) is insufficient for storing passwords — an attacker can still guess common passwords and check whether their hash matches yours.
Frequently asked questions
Is MD5 still safe to use?
Not for security purposes — MD5 is cryptographically broken and collisions can be deliberately engineered. It's still commonly used for non-security purposes like file integrity checksums, which is why it's included here. For anything security-sensitive (password hashing, digital signatures), use SHA-256 or stronger.
What's the difference between SHA-1, SHA-256, and SHA-512?
They're different algorithm variants producing different output lengths (160, 256, and 512 bits respectively) and security margins. SHA-1 is deprecated for security use like MD5; SHA-256 is the current practical standard; SHA-512 offers a larger security margin at a small performance cost.
Can a hash be reversed back to the original text?
No — hashing is a one-way function by design. What you can do is compare a hash against known values (e.g. rainbow tables for common passwords), which is why hashing alone isn't sufficient for password storage without techniques like salting.
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