Question 1

Is my data uploaded?

Accepted Answer

No. Hashing uses the Web Crypto API, which runs entirely in your browser. Your text or file is never transmitted.

Question 2

Which hash algorithm should I use?

Accepted Answer

Use SHA-256 or SHA-512 for security-critical work. SHA-1 is deprecated for security use — it is suitable only for non-security checksums. MD5 is not supported as it is cryptographically broken.

Question 3

Can I hash a file?

Accepted Answer

Yes. Switch to File mode, drop or select any file, and the hash is computed from the file's raw bytes.

Question 4

What is a hash?

Accepted Answer

A cryptographic hash is a fixed-length fingerprint of your data. The same input always produces the same hash, but even a one-character change produces a completely different output.

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