Generate
HMAC-SHA256
Wrap long lines in the input and output
Key and message
Type key: and the key on the first line, then the message on the following lines.
HMAC hex
Generate
Type key: and the key on the first line, then the message on the following lines.
HMAC-SHA256 signs a message with a key. The key shares the input box until a string option exists. The first line must start with key: and the rest of that line is the key. Everything after the first newline is the message.
The signature is 64 hex characters. Uppercase hex writes A-F. An empty key is rejected, and a missing key: prefix is rejected too, so the box is never signed by accident.
WebCrypto does not offer MD5. SHA-1 elsewhere on this tool is only for checking old systems, not for this signature. The algorithm here is HMAC-SHA256.
The key shares the input box until a string option exists. The first line must start with key: and the rest of that line is the key. The message is everything after the first newline.
HMAC-SHA256. The result is 64 hex characters. MD5 is not offered because WebCrypto does not provide it, and SHA-1 is only for checking old systems.
A first line of only key: is rejected. The page reports HMAC key is empty. A line that does not start with key: is rejected as well.
No. This runs in your browser and the text you paste is never uploaded, logged or stored. Google Analytics records page views and feature use, never content.
Compute a SHA-256 message digest from any text in your browser. The hex updates as you type, and your text is never uploaded.
Compute a SHA-512 message digest from any text in your browser. The longer hex updates as you type, and your text is never uploaded.
Check a SHA-1 digest against old systems in your browser. Use it only to compare legacy hashes, and your text is never uploaded.
Generate placeholder words, sentences or paragraphs.
Generate version-4 UUIDs from cryptographic random bytes.
Encode text as a QR code and show it as an image.
Turn text into a valid JSON string literal, or decode one back to plain text.
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