Question 1

Is my text or file uploaded to a server?

Accepted Answer

No. Hashing runs entirely in your browser — SHA family via the Web Crypto API and MD5 via a local JavaScript implementation. Nothing is ever transmitted.

Question 2

Which hash algorithm should I use?

Accepted Answer

For security-sensitive purposes (password storage, signatures) use SHA-256 or stronger — MD5 and SHA-1 are cryptographically broken and should only be used for non-security checks like file integrity verification against a known checksum.

Question 3

Can I hash a file instead of text?

Accepted Answer

Yes — switch to the File tab and select any local file. It's read and hashed directly in your browser without being uploaded anywhere, useful for verifying a download against a publisher's published checksum.

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