Diamond Digit

Seal, open, or send a file. Content only ever leaves your browser encrypted.

Sealing scrambles a file so nothing inside it can be read without the right key — the diamond cracks if the wrong password is used or the file has been altered. A sealed download needs a password you set yourself, and you're responsible for sharing it separately. A share link needs no password at all — it expires on its own, can only be opened a limited number of times, and you can shut it off early at any time.

Drop a file here, or click to choose one

Password (only needed if downloading — not for sending a link) Confirm password

Link expires after

Maximum times it can be opened

These settings only apply to a share link — a sealed download has no expiry, since it isn't tracked by any server.

download again

Your download started automatically. The extension is just a label — it isn't required to open the file, and needs no app installed. Share it however you'd normally send something; share the password separately.

Share this link — no password needed, it's built into the link Recipient's email (optional — only opens your own mail app, never sent anywhere) Add a message (optional)

Save this now — it's shown only this once. This code lets you revoke the link early. It's also saved to a "My sent links" list in this browser, so you can find it again later without needing to copy it now.

No password to share — the link itself is the credential. Diamond Digit's server stores only the encrypted bytes — never the key, never the content, never the recipient's email.

Drop a sealed file here, or click to choose one

Password (not needed if you arrived via a share link)

This preview only exists in your browser's memory for this tab. Nothing is written to disk unless you choose to save it. This can't prevent someone from screenshotting or recording their screen — no viewer can.