Hash Identifier: Find Algorithms by Digest Length Online
The Hash Identifier estimates which hash algorithms may have produced a hexadecimal or Base64 digest by measuring its byte and bit length. It lists all standard matches, including MD5, SHA-1/RIPEMD-160, the 224/256/384/512-bit families, and variable-length BLAKE2/3 candidates. Because different algorithms can produce outputs of the same size, treat the results as possibilities, not proof of the algorithm.
The Hash Identifier helps you find possible hash algorithms for a hexadecimal or Base64 digest by measuring its length. It reports the digest size in bytes and bits, then lists every standard algorithm that produces an output of that size. This makes it useful for narrowing down candidates when you have a digest but do not know which algorithm created it.
The identification is based on length, not on proving which algorithm was used. Results can include MD5 at 128 bits, SHA-1/RIPEMD-160 at 160 bits, the 224/256/384/512-bit families, and variable-length BLAKE2/3 candidates. When multiple algorithms share a digest size, all matching candidates are shown, with legacy tags where applicable. A matching length is a clue, not a definitive identification.
Hexadecimal and Base64 are different ways to represent data. The tool accepts digests in either form and reports their byte and bit length; it does not turn one digest into another or establish that a digest is valid. This is helpful when reviewing an unfamiliar hash value, comparing its size with expected candidates, or learning which algorithms can produce similarly sized outputs.
The Hash Identifier runs entirely in your browser: your input is processed on your device and is not uploaded, stored, or sent to a server. After the page has loaded, it works without a connection, and the tool is free to use. Developers, DevOps engineers, and learners can use it to inspect digest sizes while keeping the input on their own device.
Step 1: Paste or drop a hexadecimal or Base64 digest into the Hash Identifier. Use the digest value itself so the tool can assess its length.
Step 2: Review the reported byte and bit length. These measurements help narrow down which algorithms could produce a digest of that size.
Step 3: Check the complete list of matching algorithms, including any legacy tags. The tool shows every standard match for the measured length.
Step 4: Treat the matches as candidates rather than a definitive identification. Different algorithms can produce digests with the same length.
Use case: Assess whether a hash value you were given has a length consistent with expected algorithm candidates. This can help narrow down possibilities, but length alone does not verify the hash.
Use case: Explore digest lengths while learning about hash algorithms. Comparing the listed candidates shows why output size is useful but not conclusive for identification.
Use case: Inspect a digest locally instead of handing its contents to a third-party page. The identifier processes the input in your browser.
Use case: Triage an unfamiliar digest by reviewing all algorithms that produce an output of the same size, including matches marked with legacy tags.
Use case: Compare candidate algorithms for a 128-, 160-, 224-, 256-, 384-, or 512-bit digest. The reported length helps focus further investigation without claiming a unique match.
Use case: Review hexadecimal or Base64 digest values in a browser, including when you are working offline after the page has loaded.