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Legally sign documents online with SimplySign

Digitally sign contracts, business documents and other important papers directly in sproof sign with an existing SimplySign identification.


SimplySign is a modern, virtual tool for signing and validating any electronic document. It is the first of its kind offered on the Polish market and guarantees 100 % mobility – it works without a physical card and reader.

The SimplySign signature is as binding as a handwritten signature and, most importantly, it is legally binding throughout the European Union. This is confirmed by the international eIDAS regulation. The tool guarantees full integrity of the entire content of the signed document. You can be sure that no one is tampering with the document and that the signature is not forged.

Frequently asked questions

Why to sign digital instead of analogue?

Is the digital signature 100% legally valid?

Is sproof sign GDPR compliant?

How can I invite people to sign?

Can signature recipients also choose other signature providers?

Do externals have to pay for signature or be sproof sign user?

Use your existing qualified signature directly in sproof sign.

Digital Signature 2.0 - Qualified Signing without Borders throughout Europe

sproof has been working intensively on a newly developed interface for qualified signing throughout Europe over the past few weeks. Now the beta version has been officially transferred to the test phase with some important key accounts.

We have integrated the most important signature providers

We continuously update the eID Hub with new providers and authentication methods to make it as easy as possible for you to obtain legally valid digital signatures - at no extra cost.
sproof sign is the highest-rated provider in the e-signature category on the independent evaluation platform OMR Reviews for Q3 and Q4 2023, as well as Q1 2024.