---
id: KB-SC-018
url: https://app.codecontract.io/help/smartcheck/seal-or-sign-which-do-i-need
idioma: en
categoria: smartcheck
subcategoria: empezar
audiencia: usuario
nivel: basico
actualizado: 2026-08-13
tambienEn: [es]
relacionados: [KB-SC-007, KB-CO-002, KB-TL-019]
citadoPor: [KB-SC-020]
---

# Seal or sign? Which do I need

_They get mixed up constantly and answer different questions: one says «this existed», the other «I accept this»._

**Responde a:** difference between sealing and signing a document · do I need a signature or is certifying enough · certifying a document without signature · how do I prove it existed earlier

It is the doubt that wastes most time at the start, and the answer is simpler than it looks: they do not compete. Sealing answers «this existed like this on this date». Signing answers «this person accepted it». Almost every tangle comes from using one to answer the other's question.

## Which answers which question

| What you need to prove | What to use | Why |
| --- | --- | --- |
| That a document has not changed since | Seal | It fixes the exact content and the moment |
| That the other party agreed | Sign | It is a person's act, not a state of the file |
| That you sent a notice in time | Seal | What matters is the when, not acceptance |
| That terms were accepted | Sign | And keeping what was shown at signing |
| That a site photo is from that day | Seal | There is nobody who has to accept anything |

> [!IMPORTANT]
> The part almost nobody sees coming: **a signature does not by itself freeze what surrounded it**. It signs the document, not the annex it referred to, nor the email with the terms, nor that day's version of the price list. If the dispute is about those, what saves you is having sealed that material separately. Signing and sealing together is not redundant — they cover different layers of the same agreement.

## How to decide in ten seconds

**En corto**

- Is there someone who has to say yes? Then sign.
- Do you only need nobody to be able to dispute the content or date later? Then seal.
- Both? Sign the document and seal what comes with it.
- And when in doubt, look at who will ask: a client asks for a signature, an auditor asks for a date.

> [!WARNING]
> There is an asymmetry worth being clear about: **what is signed already carries a seal inside** — the moment is fixed as part of the signature — but **what is sealed is signed by nobody**. Certifying a quote does not mean the client accepted it; only that it said that on that day. Confusing the two leads to treating as closed something nobody agreed to, and that surfaces late.

## The cases most often got wrong

1. **An acceptance note** — Sign: someone accepts they received what it says.
2. **A work report with photos** — Seal for the photos; sign only if the client has to approve it.
3. **A communication with consequences** — Seal: the content and date matter, not the other side's approval.
4. **New terms** — Sign, and seal the terms document that was shown to them.

> [!NOTE]
> Which signature level suits each document, and how each kind of evidence is weighed, depends on the framework that applies to you — **eIDAS** in Europe, among others — and on the type of contract. **Your adviser decides that**; here we explain what each tool is for.

**Does sealing cost more than signing?**

They are different actions and each consumes its own; the expensive part is choosing wrong.

**Can I seal something already signed?**

Yes, and it makes sense for the material that accompanied the document.

**Is sealing an email worth it?**

Yes, and it is one of the uses most appreciated later.

## Ejemplos

**A company signs new terms with a client and attaches a price annex.**

- Signs the document and separately seals the annex shown that day

→ When the client disputes the price months later, there is a record of which annex it was.

**Something that needed signing is sealed.**

- Signs whatever somebody must accept

→ The document binds whoever signs it.

**Something that only needed dating is signed.**

- Seals whatever only has to exist on a date

→ Nobody is asked to sign unnecessarily.

**You want to prove existence and acceptance at once.**

- Signs and keeps the signature's date

→ Both questions are covered.

**Nobody knows which to choose for a given case.**

- Asks what has to be demonstrable

→ The choice comes from the question rather than from habit.

**An already signed contract is sealed.**

- Checks whether the signature already provides the date

→ Neither the work nor the cost is duplicated.