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Cryptographic Hashes
Cryptographic Hashes computes SHA-256, SHA-1 and SHA-512 digests of any text using the browser's native cryptography implementation, so the input never leaves the page.
How to use Cryptographic Hashes
- Paste the text you want to hash.
- Choose SHA-256, SHA-1 or SHA-512.
- Copy the hexadecimal digest from the output panel.
Where Cryptographic Hashes is useful
- Verifying that a message or configuration string arrives unchanged.
- Producing a deterministic key from a passphrase for a script.
- Checking a checksum you were given for a short piece of text.
- Teaching or testing how hash lengths differ.
Formats, algorithms and limits
Digests are printed in lowercase hexadecimal: 64 characters for SHA-256, 40 for SHA-1 and 128 for SHA-512. Hashing is one-way and deterministic — the same text always produces the same digest, and changing one character changes the whole result.
Troubleshooting and honest limits
- Use SHA-256 or SHA-512 for anything security-related; SHA-1 is considered broken for collision resistance.
- A hash of text is not a password storage strategy on its own — passwords need a salted, slow key-derivation function.
- Add a newline at the end if the system you are comparing against includes one; a trailing newline changes the digest.
Frequently asked questions
Can I reverse a hash back to the text?
No. Hashing is a one-way function by design. Short inputs can be guessed by trying candidates, which is exactly why passwords need salting and stretching.
Is MD5 available?
No. The browser's native cryptography does not offer MD5, and it is broken for security purposes anyway — SHA-256 is the standard replacement.
Why does my digest differ from another tool's result?
Usually because of a difference in the input: a trailing space or newline, or a line ending. Check the exact bytes being hashed.
Is the text sent to a server to be hashed?
No. The digest is computed by your browser's own SubtleCrypto implementation, offline.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. Cryptographic Hashes runs entirely in your browser — no uploads, no account and no daily limits.