Is a Base64 hash reversible?

Yes — Base64 is encoding or a checksum, not a one-way hash, so the original value can be decoded directly.

Is a Base64 hash reversible?

Yes — Base64 is encoding or a checksum, not a one-way hash, so the original value can be decoded directly.

What is Base64? How to decode it

Base64 is a encoding hash type. It is not a one-way password hash — the original value can be recovered directly without cracking. This page shows how to recognise it and the exact commands to attack it.

All identification runs locally in WebAssembly. The commands below write the hash to a local file on your machine — nothing is sent to this site.

Identifying the hash

The hash identifier on the home page detects Base64 entirely in your browser — your hash is never uploaded. A typical example looks like this:

cGFzc3dvcmQ=

Decoding this value

Base64 is not a cryptographic password hash, so there is nothing to "crack". The original data can be recovered directly:

echo 'cGFzc3dvcmQ=' | base64 -d