Sealed file and text transfer · free · no account

Send it sealed.
Opened once,
then gone.

Nexum encrypts your files and messages in your browser before they leave your computer. Only the person with the link can open them, only once. Not even we can read the content.

Seal a transfer →See how it works

Free · nothing to install · up to 5 files, 50 MB

contract-final.pdf
Encrypted in your browser · AES-256
Share this link
nexum.solsignia.com/o/7fQ2k9#k=Xr4_9vT
The highlighted key never reaches our servers. Without it, nobody can open the file, not even us.
Opens
Once
Account
None
After opening
Deleted
Sealed and link copied
Opens once · expires in 24 hours
AES-256
encryption, done in your browser
0
accounts, now or ever
1
opening, then it is deleted
24 h
until it expires anyway
50 MB
per transfer, up to 5 files

HOW IT WORKS

Three steps. No sign-up.

contract-final.pdf2.1 MB
annex-b.docx448 KB
+ add files or a message
1
Add your content
Write a message, attach files, or both. Up to 50 MB total.
Encrypting in your browser
The key never leaves your device
Optional passphrase ●●●
2
Seal it
Your content is encrypted in your browser. The key never leaves your device.
Someone sent you a sealed transfer
2 files and a message · opens once
After you open it, it is deleted for good.
3
Share the link
Send the link to your recipient. They open it once — then it's gone forever.

WHY IT IS SAFE

We hold the box. You hold the key.

Nexum is built so that we could not read your files even if someone asked us to.

nexum.solsignia.com/o/7fQ2k9#k=Xr4_9vT
This part reaches our server. It points to the encrypted file, which is unreadable on its own.
This part never does. Browsers keep everything after the # to themselves. It is the key.
Encrypted before upload
AES-256-GCM, done by your own browser with its built-in cryptography. What we store is scrambled data.
Deleted after one opening
Once opened, the transfer is removed. Unopened transfers are cleared after 24 hours.
Stored in the EU, briefly
Encrypted transfers wait on EU servers in Ireland until they are opened or expire.

WHEN TO USE IT

For anything you would not want to leave lying in an inbox.

Lawyers and notaries
A draft contract or an ID copy to a client.
Accountants
Tax papers and payslips, without email attachments.
Therapists and doctors
A report that should not sit in an inbox.
Anyone, really
A Wi-Fi password, a bank detail, a PIN for a colleague.
Optional passphrase
A second lock. Share it by phone or another channel.
Private preview
Before opening, the recipient sees only counts, never file names.
Nothing to install
Works in any modern browser, on computer or phone.

QUESTIONS

Common questions.

Something else? Write to hello@solsignia.com

No. Your files are encrypted in your browser, and the key lives only in the part of the link after the #, which browsers never send to a server. We store scrambled data we have no way to unlock.

Seal a transfer →