Shamir Secret Splitter

Split a secret into N shares where any K shares can recover it. Client-side only. No uploads.

Split

Uses GF(256) arithmetic (AES polynomial 0x11B). Shares are plain text lines you can store separately.

Secret (text)

N (total shares)

K (threshold)

Shares (one per line)

Paste any K shares (each on its own line), then combine.

Shares (lines)

Recovered secret

Notes

Keep shares in different locations (e.g., password manager + printed copy + trusted contact).
Anyone with K shares can recover the secret. Treat each share as sensitive metadata.
Format: shamir:v1:k=3:n=5:x=1:data=<base64>