Can a hash be reversed?

No. A cryptographic hash is a one-way function. You can compare hashes, but you cannot recover the original text from one.

Which algorithm should I use?

For new work, prefer SHA-256 or stronger. MD5 and SHA-1 are fine for non-security uses such as cache keys but are no longer safe for signatures.

That is the point of hashing: the same input always produces the same digest, which is what makes integrity checks possible.

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Create MD5, SHA-1, SHA-256 and SHA-512 digests.

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About this tool

Create one-way cryptographic digests for integrity checks, cache keys, and signatures. Hashing is not encryption and cannot be reversed.

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