---
id: KB-TZ-008
url: https://app.codecontract.io/help/traceability-and-compliance/someone-sent-me-a-verifiable-document
idioma: en
categoria: trazabilidad
audiencia: usuario
nivel: basico
actualizado: 2026-08-13
tambienEn: [es]
relacionados: [KB-TZ-002, KB-GL-005]
citadoPor: [KB-SC-016]
---

# Someone sent me a document and I want to check it

_How to verify a document you received, with no account, in a minute._

**Responde a:** how do i verify a document sent to me · check whether a certificate is genuine · verify a pdf with a qr code · is this document fake

If you have received a document claiming to be verifiable, you can check it yourself. No account, no permission from the sender, no need to trust anyone: that is precisely the point.

## How to do it

| What you have | What to do |
| --- | --- |
| The file | Upload it to the public verification page |
| A QR code on the document | Scan it with your phone camera |
| Only a paper printout | Ask for the original file: a photocopy cannot be verified |

## What each answer means

**En corto**

- Matches: it is exactly the document that was sealed, on the date stated.
- Does not match: that file has changed since, even by a comma.
- Not found: that document was never sealed here.

> [!WARNING]
> "Does not match" does not necessarily mean someone is deceiving you. Reprinting a PDF, re-saving it from another program or converting it changes the file. Ask for the original before drawing conclusions.

> [!IMPORTANT]
> Verification checks that the document has not changed and when it existed. It does not check that what it says is true, nor that the sender is who they claim. If it arrived from someone you were not expecting, that still deserves a phone call.

> [!NOTE]
> The check works the same years later, as long as you keep the file. It does not depend on any relationship with the sender.

**Do I need to register?**

No, and that is deliberate: whoever verifies is usually an outsider.

**Does the sender find out?**

Verifications are logged.

**Can I verify from a phone?**

Yes, including scanning the code.

## Ejemplos

**A client receives a certificate from their supplier and wants to check it is genuine.**

- Scans the code on the document

→ Confirms in twenty seconds that it is the one that was sealed, without phoning anyone.

**A document arrives and there is doubt whether it is the right one.**

- Checks its fingerprint on the verification page

→ The doubt is settled in seconds.

**The file was opened and no longer matches.**

- Requests the unopened original

→ The check comes out correct.

**The document arrived through a channel that recompresses it.**

- Requests it again uncompressed

→ The fingerprint matches again.

**It does not match and there is no explanation.**

- Documents the check and consults the issuer

→ The case is handled with the trail in view.

**Nobody knows what the check actually asserts.**

- Checks what the result says

→ The proof is not credited with more than it says.