Can a hash be reversed back to the original text?

No. SHA-family hashes are one-way functions — there's no mathematical way to recover the input from the digest. That's exactly what makes them useful for verifying data integrity or storing password checks without keeping the original text.

Which algorithm should I use, SHA-1 or SHA-256?

Prefer SHA-256 or higher for anything security-related — SHA-1 is considered cryptographically broken and shouldn't be used to protect sensitive data. SHA-1 is still fine for simple checksums like verifying a file wasn't corrupted in transit.

Hash Generator

Generate SHA-1, SHA-256, SHA-384 or SHA-512 hashes of any text.

How this is calculated

Hash = SHA-family digest of the UTF-8 encoded input, hex-encoded

Assumptions used in this calculation

Client-side only: Text is hashed entirely in your browser and never sent to a server.

About this calculator

The hash generator computes cryptographic hash digests of text using your browser's Web Crypto API, entirely client-side.

Worked example

SHA-256 of 'abc'

Result: ba7816bf8f01cfea...

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About this calculator

Frequently asked questions

Can a hash be reversed back to the original text?

Which algorithm should I use, SHA-1 or SHA-256?

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