Login

Qualified signature for entrepreneurs - mobile SimplySign vs stationary Certum Mini? A practical choice

Not sure which qualified signature to choose for your business? Learn the differences between the mobile SimplySign and the stationary Certum Mini and see which one better suits your work style.
Qualified signature for entrepreneurs - mobile SimplySign vs stationary Certum Mini? A practical choice
6-minute read Updated: August 18, 2026

When running a business, time is money, and documents—from contracts to official declarations—are part of every manager’s daily routine. That’s why it’s essential to choose a qualified digital signature that not only ensures full legal validity (equivalent to a handwritten signature) but also offers convenience and speed, whether you’re on the go or in the office. The qualified digital signature from Certum is a proven solution available in two forms: mobile SimplySign and desktop Certum Mini certum.plpodpisano.pl.

In this podpisano.pl guide, we'll take a look at what situations each of these signatures will work best for - from mobile decision-making moments to stable office operations. You'll learn which choice will best suit your needs - the fast and hardware-free SimplySign, or the classic Certum Mini with card and reader. For whom both options are suitable, how and what to use them for - all this in the following section

Mobile signature SimplySign - signature always with you

Certum SimplySign is a qualified electronic signature with a certificate stored in the cloud, working without a physical card and reader. This role is fulfilled by your smartphone.

Advantages for entrepreneurs

  • Ability to sign documents on a smartphone, tablet or computer - Without the need for an additional reader (USB type).
  • Security: two-step authentication, Certum infrastructure.
  • Convenience: signature always with you, no courier, no reader mounting. No stress of losing your card with the carrier. 
  • The signature can be seamlessly integrated (via the SimplySign API) with any document or transaction workflow system or any online banking system, enabling support for key administrative applications—e-Deklaracje, CEIDG, ePUAP, Płatnik (ZUS), e‑KRS, KSeF, JPK .
  • Qualified time stamp included (5000 pieces/month) - essential for long-term document security
  • You can sign up to 15 documents per second

When to choose

  • When you are often on the road, in meetings, on business trips - you will sign documents from anywhere With Internet access.
  • If you want to quickly sign a contract, invoice, application - even in a minute from the phone.

 

For those who want to make independent is from hardware and physical security (card, reader).

Certum Mini - classic signature with card and reader

Certum Mini is a mini signing kit: cryptographic card + USB reader (or just the card, if you already have a reader) 

Advantages for management

  • Device compact and mobile, but without the need for Internet access to sign - it works offline, card and reader always at the ready. Remember, however, that if you want full security, the time stamp is essential, and then also access to the Internet. 
  • Authorization-recognized certificate by Adobe in PDF documents - no additional configuration.
  • Qualified time stamp included (5000 pieces/month) - essential for long-term document security
  • Support for key administrative applications – e-Deklaracje, CEIDG, ePUAP, Płatnik (ZUS), e-KRS, KSeF, JPK – a signature legally equivalent to a handwritten signature, recognized in Poland and the EU pursuant to eIDAS.
  • You can sign 1 document per second

When to choose

  • If you prefer local control and physical media.
  • For online/offline office document signatures without the risk of losing your connection.
  • When you want to build procedures offline archiving (e.g., invoices, reports, contracts).

What you will use signatures for - areas of application

Documents and situations of use

  • Civil law, commercial contracts, quotations, electronic invoices (KSeF).
  • Tax declarations, JPK, applications to CEIDG, KRS, ZUS (Płatnik program).
  • Official documentation - ePUAP, Ministries, GIODO, UFG, electronic auctions and tenders 
  • In cooperation with partners - Signing company documents, posting, orders, correspondence.
  • participation in electronic auctions and tenders
  • communication within the ePUAP platform (Electronic Platform for Public Administration Services)
  • Signing statements during B2B purchases on the PGG (Polish Mining Group) store

Which signature where

 

Signature type

The best application for you

Examples of documents

SimplySign

Travel, quick decision, no additional equipment (USB)

contracts, invoices, documents in PDF format

Certum Mini

office, online,  offline, stability

 Reports, contracts, invoices, in multiple formats (not just PDF)

Comparison: mobility, security, control

  • Mobility: SimplySign wins - you don't need hardware (extra USB), sign anywhere. Certum Mini - classic, requires physical use of card and reader (USB carrier).
  • Safety: Both are top security levels of qualified signature, with eIDAS regulation and Certum certification.
  • Carrier control: Certum Mini gives you physical control of the card. SimplySign is a cloud-based solution - if you're worried that your card might get lost or damaged, then, SimplySign is convenient.
  • Integrations: SimplySign API works with most key online systems. SimplySign (mobile) - is limited to. PDF signing, however, in conjunction with SmartSign (desktop) also supports other document formats. Certum Mini works on the local computer, but it works just as effectively with programs like Adobe, Payer.

How to obtain and activate a signature

SimplySign

  1. Purchase a certificate (for 1,2 or 3 years) - online, with quick activation methods (e.g., video verification) - possible to obtain even in 30 minutes  - we invite you to podpisano.pl - Asseco/Certum Authorized Partner 
  2. Download the mobile app (Android/iOS) and/or use the desktop panel.
  3. Broadcast PIN/PUK and ready - you can sign right away.

Certum Mini

  1. Purchase a set (with or without reader) - certificate valid for 1-3 years; shipment up to 7 days or quick activation at the point podpisano.pl - Asseco/Certum Authorized Partner 
  2. Confirmation of identity - at the point - welcome to podpisano.pl - scorecard 
  3. Install the proCertum CardManager / SmartSign software.
  4. Connect the reader and import the certificate - transmit the PIN/PUK - you start signing.

Tips for CEOs and directors

  • If you are often physically absent from the office? -  SimplySign is the best choice - Mobility and speed of operation.
  • If you prefer a physical card and full control -. Certum Mini It will fit your needs better.
  • For large companies, working on integrated workflow systems, it's also worth considering integrating the SimplySign or Certum Mini through an API for process automation.Both types of signature can be purchased on a 1-, 2- or 3-year term - customize according to your security policy, budget and usage preferences

There is something for every entrepreneur - from small businesses to those managing large companies.

  • SimplySign: fast, mobile, convenient. Ideal when time is of the essence and access from anywhere.
  • Certum Mini: A reliable classic in a controlled environment, with a physical carrier.

     

Equip yourself with qualified signature and operate paperless - in compliance and efficiently. 

After the decision - contact the team at podpisano.pl to efficiently select the service, activate the signature and start digitizing your business.

Qualified signatures SimplySign and Certum Mini

If you have any concerns or questions, please contact us

+48 22 417 05 55

We'll answer your questions, find a time that works for you, and match you with an advisor at one of our locations throughout Poland.

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

Check also:

  • Confirmation of identity

A Foreign National Running a Business in Poland — From IDnow Identity Verification to KSeF

  • e-Delivery

E-Delivery and Qualified Signatures for Foundations and Associations — Requirements for 2026

  • Qualified Electronic Seals

e-CMR and Digital Waybills — The Role of Signatures and Seals

  • Qualified signatures

Qualified Digital Signatures for Notaries — Electronic Extracts of Deeds and CREWAN

See all

Do you need help?

Info
Dowiedz się więcej Add to cart
Info
Dowiedz się więcej Add to cart

Find what you're looking for