Document custody · International
Sign, seal and keep the documents your work and life run on, wherever the people in them are. Each finished file gets a fingerprint and a timestamp, so anyone can check that a copy is unchanged since sealing, free and without an account.
Personal is free, with no card and no expiry date.
Start here
Pick one. The page follows it: who signs, what gets sealed, which date is watched, and what you can ask it.
What KuduDoc does with a lease
More on each: Leases and move-in inspections Policies and school forms at home IDs, passports and licence renewals
01Sign
The tenant signs first, then the landlord — each from a link on their own device.
Place the fields, add a witness where you need one, and KuduDoc reminds whoever is still waiting.
02Seal
The moment the last signature lands, KuduDoc takes a SHA-256 fingerprint of the exact file, adds a certification signature and a certificate page, and anchors the time with OpenTimestamps. The kdid goes on the page.
Its public seal id, the kdid, goes on the certificate page, with a QR link any recipient can use to check the file.
03Keep
The lease goes into the 12 Oak Avenue collection, beside the deposit receipt and the inspection record.
The other records arrive by email to your own KuduDoc address or straight from your phone, and tags find them again across collections.
04Watch
KuduDoc reads the dates off your documents and suggests them; you confirm each one. Reminders go out 90, 60, 30 and 7 days before, by default — or the days you choose — and never during your quiet hours.
05Ask
Ask answers from your own documents and opens the passage it used, so you read the clause yourself before you rely on it.
You askedHow much notice must the tenant give?
Ask · from your documentsTwo calendar months, in writing, before the renewal date.Lease · clause 8
From the first field to the copy you need years later.
Vault Set up recovery first: if you lose both the Vault passphrase and the recovery key, nobody can recover what is inside.
Ask Answers point to the page they came from. Read it before you rely on an answer.
06Check · years later
A new landlord, a lender, a lawyer: whoever holds the file drops it on the public checker. It is free and needs no account. A match means the file is unchanged since it was sealed.
Unchanged since sealing. The fingerprint matches the sealing record.
Changed. The bytes differ from the sealed record. One re-save is enough to change them.
No matching record. No record matches this exact fingerprint. The checker cannot tell a never-sealed file from an altered one. No match does not establish tampering.
KuduDoc
Check a sealed file
Free to check · no account needed
Unchanged since sealing
The fingerprint matches the sealing record.
kdidkd_7Qm2xR9vL0aPz3Bn8KdY1w
Changed
The bytes differ from the sealed record. One re-save is enough to change them.
No matching record
No record matches this exact fingerprint. The checker cannot tell a never-sealed file from an altered one.
No match does not establish tampering.
Your PDF stays on this device.
Ordinary electronic signaturesSHA-256 of the exact bytesOpenTimestamps anchorFree to check, no accountA certificate Adobe trusts
Why KuduDoc
Documents travel by email, chat and download, and a PDF can be edited in minutes, by hand or with AI, and still look right. KuduDoc keeps the finished file, the evidence that goes with it and the dates that matter.
A sealed document can be issued as a Controlled Original. The registry records exactly one current controller, and copies issued from it are marked as copies, with a live status link.
How sealing worksEach sealed file carries a SHA-256 fingerprint of its exact bytes, a certification signature and a timestamp anchor. Anyone can drop a copy on the public checker, free and without an account.
Check a sealed fileA copy edited by hand or with AI can look identical, but it no longer matches its fingerprint. For a document KuduDoc did not seal, ask the organisation that issued it.
How to tell if a document is fakeEach signer gets a link by email and signs on their own device, with a free KuduDoc account, in the order you set. These are ordinary electronic signatures; KuduDoc keeps the evidence of who signed, when, and that the file is unchanged since.
How signing worksKeep each record in your Library beside the papers that explain it. Confirm the expiry dates on passports, visas, insurance and contracts, and KuduDoc emails you 90, 60, 30 and 7 days before.
Expiry remindersOn Family, choose the people who can ask for emergency access to your ordinary documents. You set the waiting time and can cancel any request. The Vault is never included.
Emergency accessPricing
Family and Professional start with a 14-day free trial, no card needed, and no payment is taken during the trial. Prices are per occupied seat, in US dollars. Compare every plan in full
For your own important documents.
FreeNo card · no expiry date · one account
A household of up to five people.
Free for 14 days · no card needed$6$57/ month · per occupied seat
A person with clients. Up to 5 seats.
Free for 14 days · no card needed$12$120/ month · per occupied seat
For the papers life depends on
Personal is free, with no card and no expiry date.