02 / For you

Know who sent it.Know it stayed intact.

When an organisation sends an item through Keepable, it is sealed as it arrives. You can check who sent it and whether the file has changed. Anyone you give the copy to can run the same check without an account.

Bank statements · payslips · school results · court letters · insurance policies

In the app

One document, and what it carries

Statement of account · May 2026

Northbridge Bank

  • Sender verified checked against CAC before the first letter
  • Sealed at source 2 June 2026, 09:14 WAT
  • Fingerprint 4f9a 71c0 e8d2 5b13
  • Unchanged since the moment it was sent

Anyone can check this file for themselves, without an account. Check one now.

  1. See

    You can tell who sent it

    Before a bank, court, employer or agency can send you anything, it is checked against the companies register and a director named on that register has to turn up in their own Keepable and agree to be answerable for it. The name on a document in here is a name a real person stood behind. That is the part email cannot do: a sender name is a field anybody can type.

  2. Keep

    It stays a document, not a screenshot

    What lands is the original, not a picture of one and not a link that expires. It stays yours beyond the reach of a lost phone, a wiped laptop, a flood, or a bank that reorganised its app again, and it is still the same file in five years.

  3. Prove

    Hand it to somebody who does not trust you

    A landlord, an embassy, a new employer, a court. They do not need an account and they do not have to take your word for it. They choose the file you gave them and their own browser tells them whether it is the one that was sent.

A seal is not a badge drawn on a screen. It is arithmetic on the file itself.

What is sealed
The exact bytes of the document, as they were the moment the sender sent it.
What a check proves
That the file in your hand is the file that was sent, and not a version of it.
Where it happens
In your own browser. The file never leaves your phone, and there is nothing to sign in to.

The detail

What is the fingerprint, actually?
A SHA-256 digest: the whole file run through a standard calculation that produces one 64-character value. Change a single character of the document, or a single pixel of a scan, and the value that comes out is completely different. It is not a summary of the file and you cannot work backwards from it to the contents.
If the file never leaves my phone, what does the check send?
Two things: the fingerprint your own browser worked out, and the receipt code printed on the document. That is the whole request. The bytes stay on your device, which is why you can check a medical report or a court letter in front of somebody without handing it to us in the process.
What is the receipt code on the document?
Twenty characters in five groups behind a KP prefix, from an alphabet with the letters people confuse dropped, so it can be read aloud down a phone or typed off a printout. It is not a password. Somebody who has the code and not the file cannot learn anything, because the check needs both.
Does the seal prove who sent it, or only that it has not changed?
There are two strengths and the verifier tells you which one you have. Every document is sealed here, which proves it has not changed since it arrived. Some also carry the sender's own signature over the contents, checked against the key that sender publishes, and that is the stronger claim: this is what they sent, not merely what we received.
What if the sender goes out of business, or Keepable does?
The document keeps its proof either way. A signed agreement carries its validation material inside the file, so it can be checked years later against a certificate that has since expired, by somebody who never heard of us.
Can I check something I uploaded myself the same way?
Yes, and it comes back saying so. Your own uploads are sealed too, so you can prove nothing has changed since you put it here. There is no sender name on that one, because there was no sender. See the page on your own documents.

The limit

A seal proves that a document has not changed since it was sent, and that it came from the organisation named on it. It does not tell you the contents are true. If your bank sends you a statement with the wrong balance, the seal proves your bank sent you that statement. The balance is still an argument between you and your bank.

Start here

Check a document now

Items sent through Keepable arrive sealed. Files you add yourself are marked as your own. Open your Keepable.