A seal is a tamper-evident fingerprint of your document. Opcilo stores the file securely and gives you a verification link anyone can open.

Do recipients need an account?

No. Verification links work for anyone. Recipients see seal status, issuer, and document details without signing in.

What file types are supported?

PDFs get a watermarked seal. Office, images, CSV, CAD, video, ZIP, and more use integrity sealing with cryptographic hash and verified download.

Pro and Team plans include revocation. A revoked seal shows a clear status when someone tries to verify it.

Yes. Files are encrypted at rest with AES-256 on Azure, each seal carries a SHA-256 fingerprint so recipients can confirm integrity, and workspace data is isolated per organization. Sign-in uses Microsoft Entra. We do not claim end-to-end encryption — sealing and PDF processing require server-side access to file contents. Free share links expire after 7 days as an exposure-reduction control on download access — not a claim that the seal record disappears. Opening a verification code can still show seal status after a Free share link expires; Pro and above can choose longer durations. Read more on the Security page.

Can I send multiple documents in one verification link?

Yes — on Pro and above. Seal Bundles group multiple documents under one verification link. Recipients receive one notification with that link—not one email per document. Each document still counts toward your monthly seal quota.

How does Opcilo help with invoice attachment chaos?

Pro lets you share an invoice for review before you seal. Clients confirm, request changes with a comment, or reject — and you see that feedback in your workspace. When you Issue, one verification link shows integrity, amount due, and Pay Now.

How do Document Requests help me collect documents?

Create a checklist, share a secure link, review each upload as Verified or Rejected, send a response so recipients resubmit only rejected items, and finish when every required item is confirmed. Request-item Verified is requester review — not the same as seal Document integrity.

Prove the file you sent is the file they got.

Seal a file so anyone can confirm it hasn’t changed since sealing—no account needed.

Like a wax seal on a letter, but for digital documents.

Start free Check a document

Explore how it works

Received a document with a code?

Sample

Sample check

This is not a real document.

Sample result

MatchSwapped fileRevokedLink expired

Verify it yourself

Sealed record found

This page confirms a seal record exists. Check the file you received to see if your copy matches.

invoice.pdf

SMP-L7K-3NX

Example Trading

Email confirmed

Business verification not completed. Opcilo has not reviewed this issuer as a registered company.

Not part of this seal: identity, signature

What Opcilo recorded

Sealed at	Mar 2, 2026 at 12:00 PM UTC (UTC+0)Mar 2, 2026 at 12:00 PM UTC
Status	ActiveActive means this seal is not revoked.
Integrity method	SHA-256

View integrity details

Content hash

9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08

What this does and doesn’t mean

A sealed record means Opcilo has a completed seal with a stored fingerprint for this file — it is not a live re-check of storage on every page load, and it is not a statement that the contents are true. Business verified by Opcilo means the business completed Opcilo’s business verification — not that the issuer is honest. Identity and signature are not part of this seal.

This seal confirms the file has not been altered since it was sealed, and can be traced to the issuer's Opcilo account. It is not notarization, legal certification, or government attestation.

Sample issuer is email-verified only — not business-verified (KYB).

This is not a real document.

What happens to a sealed file

1/4 · You seal

invoice.pdf

X7F-G2K-9PX

You seal the invoice and get a short verification code.

Problems we solve

Everyday document trust problems

Three everyday trust gaps — each opens a dedicated solution page.

Was this file changed after it left me?

Seal it, then anyone can check Document integrity in seconds — without creating an account.

How can I collect documents from others?

Document Requests: create a checklist, share a secure link, review each item, send a response, resubmit rejected files only, and confirm when complete.

Which PDF was the final invoice?

Seal the invoice so clients confirm integrity and amount due on one page — then Pay Now or your payment instructions.

Where to start

I send, I receive, or I collect

Pick the path that matches how you use documents today.

Paths rotate automatically — pause anytime

Seal a document in three steps

Seal it, send it, they check it.

1
Seal it
Upload your PDF, invoice, or other file and seal it. You get a short verification code.
2
Send it
Share the file with the code — by email, WhatsApp, or USB. No special app required.
X7F-G2K-9PX
3
They check it
Open the link or enter the code to see seal status and integrity. To confirm a file you hold matches the seal, upload a copy for a one-time hash check on the verification page — it is not saved as a sealed document and is discarded when the check finishes.
✓

Claim truth

What Opcilo proves

Opcilo proves document integrity and whether the issuer is verified. Identity and signature are separate claims and are not available today.

Document integrity
Available today
When a seal succeeds, recipients can confirm the file is unchanged since it was sealed — via fingerprint and status.
Issuer verified
Available today
Shown only after business verification — Know Your Business (KYB). Email-verified accounts are not Issuer verified.

Identity verified
Not available today
Opcilo does not run person identity checks today. This claim is never shown as verified.
Signature verified
Not available today
A preserved signed PDF is not treated as cryptographic signature verification. This claim is never shown as verified.

Verification does not prove the statements inside the document are true.

Where Opcilo fits

Explore what else Opcilo does

Each path states plan gates clearly — Start free or see pricing.

Embeddable verification cardA live card on your site that links to the full record.

Security you can take literally

AES-256 at rest, SHA-256 per seal, Microsoft Azure, and workspace isolation. Read the full Security page for controls and limits.

Sealed documents stay in the workspace region you choose — UAE North or Canada Central. Where data lives

SHA-256 sealed fingerprints
AES-256 encryption at rest
Workspace-isolated document storage

Read Security

Data residency

Choose where your sealed documents live

Your sealed documents stay in the region you choose, and they’re never moved elsewhere unless you ask. Right now, new workspaces can be set up in Canada Central.

UAE North is coming soon to support the Gulf and Middle East. Need another region? Contact us and we’ll talk about opening one for your team.

Live
Available on request
Coming soon

New regions are opened based on customer need. Each region comes with its own legal terms.

Regions

Region upon request
Don't see your region? We are also open for regions that are not listed. Ask us.

Simple pricing that grows with you

Start free with 5 seals per month. Upgrade for more volume, invoice branding, Trust Badge, or team invites.

View all plans Start free

Free

$0 · 20 invoice sends / month

5 seals / month

Pro

$14.99/mo · 200 invoice sends / month

150 seals / month

Team

$49/mo · 500 invoice sends / month

750 seals / month

Prices shown for Global · View all regions

Common questions

: A seal is a tamper-evident fingerprint of your document. Open the link or enter the code to see seal status and integrity. To confirm a file you hold matches the seal, you can upload a copy for a one-time check on the verification page.
Read the What is Opcilo guide



: Yes. Files are encrypted at rest with AES-256 on Azure, each seal carries a SHA-256 fingerprint so recipients can confirm integrity, and workspace data is isolated per organization. Sign-in uses Microsoft Entra. We do not claim end-to-end encryption — sealing and PDF processing require server-side access to file contents. Free recipient links expire after 7 days to reduce exposure; Pro and above can choose longer durations.
Read the Security page
View subprocessors

Ready to send documents no one can question?

Start free with 5 seals per month. Seal your first document and share a verification link today.

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