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Send files nobody else can open. Not even us.
Send files up to 500 GB and passwords that disappear once opened. Collect documents from clients, get contracts signed, check who your client is, and see who opened what. Free for files up to 5 GB.
- No account needed to download
- Stored in the EU
- We cannot read your files
Who it's for
One product, three kinds of work that cannot afford a leaked link.
Client files that stay confidential
Contracts, disclosures and IDs go out encrypted and come back signed, and you can prove who opened them and when.
More for law firms- Activity for each person: opened, started, finished, and on which browser
- Only the people you name can open it, each with their own personal link
- File requests with a checklist, where clients upload with an access code
- Signature requests with a completion certificate anyone can check
Everything a sensitive file needs
Privacy for the file, proof for you.
Only you and them
Your browser encrypts each file before upload. We store only the encrypted file, never a key or a password.
Activity
See who opened the link, who started the download and who finished it.
Gone once used
Files deleted after one download, and secrets for passwords, keys and notes that disappear once opened.
File requests
A page with your branding where clients send you files that only you can open.
Get documents signed
Send a PDF for signature. Signers sign in their browser, and you get the signed PDF with a completion certificate anyone can check.
Teams at a flat price
Seats are part of the plan: 10 on Studio, 25 on Business.
On your own website, too
Put a file request on your site with one piece of code. Clients send their documents without leaving your page, and each one arrives encrypted in your Inbox.
- Paste it into WordPress, Wix, Shopify, Squarespace, Webflow or any page of your own.
- Clients confirm their email and send. No account, and you see what is still missing.
- Works on every plan, Free included. From Studio, it carries your name and colours.
Signatures, encrypted from end to end
Send an engagement letter or a contract for signature. Your clients sign in their browser, field by field, and you get a completion certificate anyone can check.
- Signers need no account: a code to their email confirms it is them.
- Send from the browser or the command line, or have your AI assistant prepare one for you to check and send.
- We never see the document or a signature.
Check who your client is
Ask a client to confirm who they are with a link: a photo of their ID and a selfie, checked by Didit, with sanctions and address checks when you need them.
- No account or app for your client; about five minutes on a phone.
- The result is locked to your workspace's key, with a PDF record for your files.
- Ask from the app, the API or your AI assistant.
The key never reaches us
A link has two halves. Browsers never send the part after the # to any server, so that is where the key lives.
share.deltabreen.eu/s/m8Qx2rSent to our server. Finds the encrypted file.#Kf3vT0q9ZrLw1xN8Never leaves the browser. Opens the file.Drop a file
Your browser makes a random key and encrypts the file in 4 MB pieces. Big uploads continue if the tab closes.
Send the link
Copy it, email it from the app, or post it to Slack. Add a password and it takes both to open.
They download
Their browser fetches the encrypted file and decrypts it on their device. You see the activity.
Or ask your AI assistant
Connect Claude, ChatGPT or Cursor once, then ask it to send a file. The file is encrypted on your machine and never enters the model.
Send your first file in a minute
No card. Sign in with a code sent to your email.