Developer Tools

Developer utilities that do one job and do it locally. Because the work happens in your browser, you can paste real values in without them being transmitted anywhere — which matters for exactly the kind of data you tend to be hashing or inspecting.

The SHA1 hash generator turns any text into a fixed 40-character hexadecimal digest. The same input always produces the same output, and the process is one-way: you cannot recover the original text from the hash. That property is what makes it useful for verifying that a file or message has not changed in transit, and it is why Git uses SHA1 to identify commits.

One important caveat. SHA1 is no longer considered secure against deliberate collision attacks — it is possible to construct two different inputs that produce the same hash, and this has been demonstrated in practice. It remains perfectly reasonable for checksums, content addressing and non-adversarial integrity checks, but it should not be used for digital signatures, certificates, or password storage. Use SHA-256 or better where an attacker might be motivated to force a collision.