Hash Generator
Generate SHA-1, SHA-256 and SHA-512 hashes.
Output will appear here.
What is a Hash Generator?
A cryptographic hash reduces an input of any length to a fixed-length fingerprint. The same input always gives the same digest, and changing a single bit changes roughly half the output bits — so a digest is a cheap, reliable way to ask "is this exactly the same data?".
Hashing is one-way. There is no operation that turns a digest back into its input; "decoding" a hash means guessing inputs until one matches, which is what a rainbow table or a brute-force attack does.
The SHA-2 family — SHA-256, SHA-384, SHA-512 — is the current default for integrity checks and signatures. SHA-1 is broken for collision resistance and should not be used for anything security-bearing, though it still appears in Git object IDs and older protocols.
When you need it
- Verifying that a downloaded file matches its published checksum.
- Comparing two large inputs without diffing them.
- Producing a stable cache key or ETag from content.
- Deduplicating records by content rather than by identifier.
- Checking that a webhook payload matches the signature its sender computed.
How to use the Hash Generator
- Paste or type your text into the input panel.
- Pick the algorithm — SHA-256 is the sensible default.
- The hex digest appears immediately, along with its length in bits.
- Copy the digest.
Examples
Hash Generator features
Frequently asked questions
Why is MD5 not offered?
The web platform does not provide MD5, and it is comprehensively broken — collisions can be produced on a laptop. Shipping a JavaScript reimplementation of a broken hash would add weight while encouraging a bad choice, so SHA-2 is offered instead.
Can I reverse a hash back to the original text?
No. Hashing is one-way by construction. Sites that appear to "decrypt" a hash are looking it up in a table of previously computed inputs — which works only for short or common values.
Which algorithm should I choose?
SHA-256 unless something dictates otherwise: it is fast, universally supported and secure. SHA-512 can be quicker on 64-bit hardware. Use SHA-1 only for compatibility with an existing system, never for new security decisions.
Is this the right way to store passwords?
No. A plain hash is far too fast, which is exactly what an attacker wants. Passwords need a deliberately slow, salted algorithm such as bcrypt, scrypt or Argon2.
Will I get the same digest as sha256sum?
Yes, for the same bytes. Watch for a trailing newline — echo adds one, and that changes the digest. Use echo -n to match.
Is my data uploaded to a server?
No. Every iZZi DevTools tool runs inside your browser using the standard web platform. The data you paste is processed on your own machine and is never transmitted, stored or logged by us.
Do I need an account?
No. Every core tool is free, unlimited and works without signing in. An account only adds conveniences such as saved snippets and history.
Does it work offline?
Once the page has loaded, yes. Because the processing happens in the browser rather than on a server, the tool keeps working if your connection drops.