Tvarka Sign and electronic signatures

Smart-ID, Mobile-ID, LT ID, USB/eID and NFC: which signing method to choose

A practical guide to choosing, whether you need to sign quickly, cheaply, or without buying any hardware.

Updated: 2026-08-20 Query: Smart-ID Mobile-ID LT ID USB eID NFC difference qualified electronic signature

One result, several routes

Tvarka Sign lets you pick the means to match the situation: Smart-ID, Mobile-ID, LT ID, a USB or eID card, or your national ID card held against an NFC phone.

If the means produces a QES, the legal effect is the same in every case: the document carries a qualified electronic signature. What differs is convenience, cost, whether you need extra hardware, and where the signing key is kept.

How to choose

Smart-ID and Mobile-ID are the most convenient when you have no card reader to hand. USB/eID and NFC are often cheaper, because they rely on the ID card or token you already hold.

If several people in a team sign, Tvarka charges no per-seat fee: the Manager grants access, and each person signs with their own means.

  • Speed: Smart-ID, Mobile-ID or LT ID.
  • Lower cost: USB/eID, or NFC with an ID card.
  • Working at a computer: USB/eID through the Tvarka QES Bridge.
  • Working on a phone: an ID card over NFC.

Frequently asked questions

Do all of these produce the same QES?

If a qualified means and a qualified certificate are used, the result is a QES. Internally Tvarka keeps qualified methods separate from its own non-qualified e-signature.

Do I pay for an attempt that fails?

No. Tvarka pricing is based on successful chargeable actions; a failed or cancelled signing does not count as a successful QES.

Can an invited user sign with their own means?

Yes. The Manager grants access to the invited person, who then signs with their own Smart-ID, Mobile-ID, USB/eID or NFC means.

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