How to get your client to sign a quote online

A quote accepted in writing avoids misunderstandings about price, deadlines and the scope of the work. And if the client signs it from their phone in a minute, you close the deal sooner and without paperwork.

MultiDocs team2 min readUpdated on 29 October 2026With official sources

In 30 seconds

  • The client accepts and signs the quote on their phone, without printing or scanning.
  • The record shows who accepted, when and which version.
  • Under Spanish law, contracts are formed by consent (Código Civil, art. 1258): the signed acceptance is your proof.

Step by step

  1. Save your quote as a PDF, from your invoicing software, Word or Excel.
  2. Upload it at Sign for free and choose “Someone else”.
  3. Tap “Signature” and drag it next to “Accepted by the client”. If you like, add “Name”, “DNI/CIF” and “Date”.
  4. Enter their name and email, or their mobile number to send it by WhatsApp.
  5. Once they sign, you receive the signed PDF with a record: date, time and details of who accepted.

Official data

2,986,667

SMEs in Spain, 99.8% of all companies. 1,633,875 have no employees.

Source: Spanish Ministry of Industry, Sept. 2026
94.8%

of people aged 16 to 74 in Spain use instant messaging such as WhatsApp.

Source: Eurostat, 2025

What a quote should include to serve as proof

  • Your details and the client's, with their tax ID (NIF or CIF).
  • A clear description of the work or product, quantities and price.
  • Taxes (VAT) and total.
  • How long the quote is valid for and the payment method.
  • A space for “Accepted by the client”, with name, date and signature.

Tips to get it signed sooner

  • Send it through the channel your client uses. Many people reply to a WhatsApp sooner than to an email.
  • Ask only for the details you really need.
  • Let MultiDocs send the reminders: if they don't sign, we remind them every two days.

Frequently asked questions

Is a quote signed on a phone valid?

Yes. It's an electronic signature under the European eIDAS regulation, and the record shows who accepted, when and from where.

Can someone from my company sign it too?

Yes. You can add several people to sign the same document, at the same time or in order.

Official sources

We checked each source on 29 October 2026. If you spot outdated information, email us at info@multidocs.es.

More guides

SMEsElectronic signature for small businesses and freelancersWhat to sign, how valid it is and how to get started.SMEsPPE delivery receipt templateA template ready to copy and sign from a phone.SMEsElectronic signature for employment contractsContracts and staff documents from a phone.