Can I reverse a hash?

No. A hash discards information. What lookup services actually do is hash enormous wordlists and check for a match, which only works when the input was guessable.

Should I hash passwords with SHA-256?

No. Use a purpose-built password hash — argon2id, scrypt or bcrypt — which is deliberately slow and salted. Fast hashes are exactly the wrong tool.

Hash Generator

Compute SHA-1, SHA-256, SHA-384, SHA-512 or MD5 of text.

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About this tool

SHA family digests come from the Web Crypto API. MD5 is computed by a bundled implementation because browsers deliberately do not offer it.

Limitations

Hashing is one-way and is not encryption. There is no decrypt button and there never will be.
MD5 and SHA-1 are broken for collision resistance. They remain fine as non-security checksums and nothing more.

Questions

Can I reverse a hash?: No. A hash discards information. What lookup services actually do is hash enormous wordlists and check for a match, which only works when the input was guessable.
Should I hash passwords with SHA-256?: No. Use a purpose-built password hash — argon2id, scrypt or bcrypt — which is deliberately slow and salted. Fast hashes are exactly the wrong tool.

Privacy

This page does its work in your browser. What you paste is processed by JavaScript running on your own device and is never sent to a DevToolery server — there is no server that could receive it. The page itself is a static file delivered by a CDN. See exactly what is stored.