About SPHINCS+ Signing

This FIPS 205-compliant tool supports SPHINCS+ SHAKE variants (128f, 192f, 256f) for quantum-resistant digital signatures.

Generate Your Quantum-Safe SPHINCS+ Signature

Use this tool to create quantum-resistant digital signatures with SPHINCS+ SHAKE (128f, 192f, or 256f). Sign any file type - images, PDFs, videos, documents, etc. - by entering your private key and data below. Paste text (up to 1KB) or upload files (up to 5MB).

Private Key (128, 192, or 256 hex characters):

Or upload private key file (max 1KB):

Data to Sign (max 1KB if pasted):

Or upload data file (max 5MB, any type - images, PDFs, videos, etc.):

SPHINCS+ Variant (determined by key length):
128f 192f 256f