Security Studio · 27 tools

Hash & Crypto Tools

31 free hash and crypto tools: MD5, SHA-1, SHA-256, SHA-512, SHA-3, bcrypt, HMAC, PBKDF2, CRC32 and file checksums in your browser.

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About Hash & Crypto Tools

Hash and Crypto Tools has 31 tools for checksums, password hashing and quick security checks. The MD5 Hash and SHA-256 Hash tools hash text instantly, and Hash All shows many algorithms at once, including SHA-3, Keccak, BLAKE2, BLAKE3 and RIPEMD-160. The File Hash Calculator checks a download against the checksum its publisher lists, and Hash Compare tells you whether two values match.

For password storage there are bcrypt with an adjustable cost factor and PBKDF2, and HMAC tools sign messages with a shared key. CRC-16, CRC-32, Adler-32 and FNV cover non-cryptographic checks, and the Luhn and ISBN validators confirm check digits. Results are verified in automated tests against published test vectors such as FIPS 180-2 and the relevant RFCs, and hashing happens on your device so files and secrets are not uploaded.

Frequently asked questions

Can a hash be reversed to get the original text?
No, not directly. But short or common inputs can be found by guessing, which is why passwords need a slow, salted hash like bcrypt.
Which hash should I use for file checksums?
SHA-256 is the common choice today. MD5 and SHA-1 still catch accidental corruption but should not be trusted against deliberate tampering.
Why does bcrypt give a different hash every time?
Each hash includes a new random salt. To check a password, use the verify option, which reads the salt from the stored hash.

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