Free Tools /Development
Hash Generator (SHA-1, SHA-256, SHA-512)
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, in hex and base64.
- Free, no signup
- Runs in your browser
- Nothing stored
Calculating…
Who uses it, and for what
Hash customer emails (SHA-256) before uploading them to ad platforms' matched audiences.
Create a stable de-duplication key for records that have no id.
Check what a Crypto node should output for a given input.
How this tool works
Web Crypto API
Hashes are computed by your browser's built-in cryptography, not a script library.
Four algorithms at once
SHA-1 for legacy systems, SHA-256 and above for anything new.
Two encodings
Hex for most APIs, base64 when a header expects it.
Frequently asked questions
Should I lowercase emails before hashing?
Yes. Ad platforms expect trimmed, lowercase emails before SHA-256 hashing, otherwise matches fail.
Can I hash passwords with this?
No. Passwords need slow, salted algorithms like bcrypt or argon2, not plain SHA.
Why no MD5?
MD5 is broken for security use and not available in the Web Crypto API. Use SHA-256.
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Done for you
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