How can I confirm the validity of a qualified electronic signature in an uploaded document?

How can I confirm the validity of a qualified electronic signature in an uploaded document?
3 min czytania Aktualizacja: 21 November 2025

Qualified electronic signature is the digital equivalent of a handwritten signature, which has full legal force. It enables secure and reliable signing of electronic documents. However, in order to be sure that the document you received was actually signed with a valid signature, you need to verify its authenticity. Here are the steps to help confirm the validity of a qualified electronic signature.

How to verify a qualified electronic signature?

1. use dedicated signature verification software

Qualified signature providers provide tools for verification, such as Sign, ProCertum SmartSign, Sapphire, Sigillium. With these applications, you can verify that a document is signed and that the signature is valid. However, they do not generate any evidence. 

However, if a document is needed confirming the result of the validation carried out, which you can use, for example, during legal proceedings, then the best solution is to use a paid application Webnotarius.

2. take advantage of online services

If you do not want to install additional software, you can use online services:

- Signature verifier na stronie ePUAP - https://www.gov.pl/web/gov/podpisz-dokument-elektronicznie-wykorzystaj-podpis-zaufany 

- Verifier On the Fiscal and Customs Electronic Services Platform -.  https://puesc.gov.pl/wer/ 

 

Steps:

  1. Go to the page of the selected service.
  2. Load the document you want to verify.
  3. Follow the instructions on the page.



3. use Adobe Acrobat Reader DC for PDF files

If the document is in PDF format, you can use the Adobe Acrobat Reader DC:

Steps:

  1. Download the program from the manufacturer's website: https://get.adobe.com/pl/reader/
  2. Open the document with Adobe Acrobat Reader DC.
  3. Click on the signature icon or go to the „Signatures” tab.
  4. The program will automatically check the validity of the signature and display an appropriate message.

What to look for during verification

- Certificate status: Make sure that the certificate used to sign the document is valid and has not been revoked.

- Trusted provider of certification services: Verify that the certificate was issued by an entity listed in the register of qualified trust service providers - https://www.nccert.pl/

- Integrity of the document: Verification should confirm that the document has not been altered after it was signed.

Verification of a qualified electronic signature is crucial to confirm the authenticity and integrity of the document received. Using the available tools and services, you can quickly and effectively confirm the validity of your signature, ensuring complete security in electronic transactions.

Qualified signatures SimplySign and Certum Mini

If you have any concerns or questions, please contact us

+48 22 417 05 55

We will answer your questions, find a date that suits you and an advisor in Gdansk, Gdynia, Krakow, Warsaw or Wroclaw.

You can also write an email from us [email protected]. 

SimplySign podpisano
from 299,00 PLN
SimplySign to innowacyjny, mobile electronic signature, which eliminates the need for physical cards and readers. With compatibility with systems Android, iOS, Windows and Mac OS, you can sign documents from anywhere and at any time. The installation and activation process is simple and quick, and the it can take as little as 30 minutes to obtain the certificate With online verification. Sign with full legal power, increasing the efficiency and security of your company's enterprise. Invest in SimplySign today And take your business to the next level of digital mobility!
Certum Mini - qualified electronic signature
from 282,00 PLN
Certum Mini to equipped with a reader and a cryptographic card, kwalifikowany podpis, zgodny z certyfikacją eIDAS, Certum Mini is compatible with a wide range of business software and operating systems MacOS, Windows and Linux. The package includes 5000 time stamps per month, which further guarantees the authenticity and integrity of the documents. It provides the highest level of security offering full legal power and reliability. When you invest in Certum Mini, you gain security, convenience and time savings.
SimplySign renewal podpisano.pl
from 149,00 PLN
SimplySign digital signature renewal is a key process that ensures the continued validity and full legal force of your digital signature. With simple and quick renewal process, which can be carried out online, you can extend the validity of your qualified electronic signature by 1, 2 or 3 years. The renewal process is tailored to your needs and guarantees to save you time and resources, eliminating the need to go through the paid identity confirmation procedure again.
from 149,00 PLN
Once every one, two or three years, depending on how long your Certum Mini qualified signature was previously issued for, it is necessary to renew it. If you don't do it in time, your signature will stop working. In this case it will be necessary not only to buy a new certificate, but also to go through the whole paid procedure of confirming identity. If there is some time left before the deadline, indicate that you want the renewal period to start when the previous purchase expires.
Certum Mini Qualified Stamp Podpisano
The Certum Mini qualified electronic seal is a modern solution for authentication of digital documents, dedicated to both companies and institutions. Thanks to compliance with the eIDAS regulation, the seal provides full legal force, authenticity and integrity of documents, so it is Ideal for signing contracts, invoices and official correspondence. It is available in the form of Cryptographic card with USB-A or USB-C reader, which provides flexibility and convenience of use. When you invest in Certum Mini, you gain security and save time.
SimplySign qualified seal podpisano
Select SimplySign Qualified Electronic Seal to. automate business processes and ensure the security and authenticity of your electronic documents. Thanks to its compliance with eIDAS and Polish law, SimplySign offers the full legal force and modern cloud solutions, ideal for companies of all sizes, enabling the signing of contracts, invoices and other company documents. No card readers required and is compatible with a wide range of office programs and computer operating systems.
Switching from Certum Mini to SimplySign - podpisano.pl
Switching from Certum Mini to SimplySign allows for greater efficiency and convenience in managing signatures. SimplySign eliminates the need for physical cards and readers, allowing you to sign documents from anywhere. The process of swapping signatures is simple and follows the same process as SimplySign signature renewal, ensuring a quick and seamless migration to the new system.
Transitioning from the Sapphire sub-route to SimplySign - podpisano.pl
Whatever qualified signature provider you currently use, you can easily replace it with SimplySign. Switching to SimplySign increases mobility, convenience and efficiency In managing electronic signatures. SimplySign offers a modern approach to document signing, eliminating the need for physical cards and readers. The signature swap process is simple and follows the same process as SimplySign signature renewal, ensuring a quick and seamless transition.  

Check also:

Do you need help?

Find what you're looking for