This app runs entirely in your browser — nothing is sent to any server.
For extremely sensitive secrets, download and run offline. See offline mode notes below.

SecretShards▲

Split secrets with Shamir's algorithm. Recover with a threshold of shares.

Split Combine

Threshold

of

Minimum needed to recover — total shares to create

Name (optional)

0 / 20

Secret

0 / 512 bytes

Secret exceeds 512 bytes. Shorten it to enable splitting.

Shares will produce large QR codes — print at high resolution for reliable scanning.

Shares

Recovered Secret

If this doesn't look right, check that you're using the correct shares.

What is Secret Sharing?

Secret sharing lets you split sensitive information into multiple parts called "shares." You choose how many shares to create and how many are needed to recover the original — for example, split into 5 shares where any 3 can reconstruct the secret. This uses Shamir's Secret Sharing, a proven cryptographic algorithm trusted since 1979. No single share is useful on its own — only the right combination can recover your secret.

SecretShards is built to last. It has zero external dependencies — just plain HTML, CSS, and JavaScript with no frameworks, no build tools, and no CDN links that could go offline. The only vendored library is a QR code generator and scanner. Download a copy today and it will work exactly the same in 50 years — even if this domain goes down.

When to use it

Personal security — Split a password manager master password among family members, so no single person holds the full key but the family can recover access if needed.
Cryptocurrency — Back up a wallet seed phrase or private key. Store shares in separate locations so a single break-in or lost device doesn't mean lost funds.
Business continuity — Distribute access to critical systems among team leads. If someone leaves or is unavailable, the remaining team can still recover access.
Estate planning — Include shares of important passwords or PINs in documents held by different trusted parties, ensuring access passes on without exposing secrets prematurely.
Secure backup — Split any sensitive text — API keys, recovery codes, encryption passphrases — and store the shares in different places: a safe, a cloud drive, a trusted friend.

Offline mode

Using the hosted version is fine for most secrets. Nothing is sent to any server — everything runs in your browser. And many secrets (like a PIN or password) are just one layer of security and useless without the thing they protect.
Camera scanning requires a web server. When running offline, QR scanning via camera is unavailable due to browser restrictions. File upload and copy/paste work fine.

No tracking. No analytics. No data collection.

Your secrets never leave your browser. This app has no server-side component, no cookies, and no third-party scripts.

© 2026 SecretShards.com by Ellin Pino

QR code generation and scanning by paulmillr-qr (MIT license)

Scan QR Code