In short: You can sign a contract online for the vast majority of business agreements, because EU law generally recognises freedom of form. The key is matching the signature level to the contract: a simple or advanced electronic signature for everyday agreements, and a qualified electronic signature (QES) where written form is legally required. A well-designed online signing flow also reduces drop-off and captures the evidence you may need later.
Most commercial agreements do not require ink on paper. Under Regulation (EU) No 910/2014 (eIDAS) and national contract law, parties are usually free to choose the form of their agreement, which means you can sign a contract online and have it be just as binding as a paper version. The practical questions are which signature level to use, how to make signing painless for the counterparty, and how to preserve proof. This guide walks through all three.
Is it legal to sign a contract online?
For most contracts, yes. Article 25 of eIDAS establishes that an electronic signature cannot be denied legal effect or admissibility as evidence merely because it is electronic. Combined with the principle of freedom of form in Austrian and German civil law, this means the majority of B2B and B2C agreements can be concluded electronically without any special formality.
A minority of contracts are exceptions. Certain agreements are tied to a statutory written form or even notarisation, and for those you either need a qualified electronic signature that is legally equivalent to a handwritten one, or you cannot sign a contract online at all. Knowing which category your document falls into is the first step.
Which signature level fits which contract
eIDAS defines three levels, and choosing the right one is a balance between legal weight and friction:
- Simple electronic signature (SES): suitable for low-risk internal approvals, order confirmations and many everyday agreements.
- Advanced electronic signature (AES): uniquely linked to the signer and able to detect later changes, a strong choice for commercial contracts of moderate value or risk.
- Qualified electronic signature (QES): legally equivalent to a handwritten signature under Article 25(2) of eIDAS, and required where the law prescribes written form.
A useful rule of thumb: the higher the value, the longer the term, or the greater the legal exposure, the higher the assurance level you should use.
How to sign a contract online, step by step
A dependable online contracting flow follows a consistent sequence:
- Prepare the contract as a final PDF and define who needs to sign and in what order.
- Choose the signature level based on the contract type and its legal requirements.
- Identify the signer to the degree the chosen level requires, up to verified identification for a QES.
- Send the document through a signing platform that guides each party to their signature fields.
- Apply the electronic signature in the PAdES format, ideally with a qualified timestamp.
- Store the signed contract together with its validation data so it stays verifiable.
Following these steps lets you sign a contract online in minutes while still capturing everything you would need if the agreement were ever questioned.
Reduce drop-off and keep the evidence
The commercial value of signing online is not just speed, it is completion. Every extra step, download or account creation is a chance for the counterparty to abandon the process. Remote signing that works in the browser, on any device, and asks only for the identification the chosen level genuinely requires, keeps completion rates high. Where a QES is needed, remote identity verification lets the signer complete everything without a branch visit.
Evidence matters just as much as convenience. When you sign a contract online with an advanced or qualified signature, the signature binds to the document so any later change is detectable, and a qualified timestamp fixes the moment of signing. Preserving this data means the agreement remains provable long after the deal closes, which is precisely what you want if a dispute ever arises.
How primesign helps
primesign lets you sign a contract online at the assurance level each agreement needs, from a quick electronic signature to a fully qualified electronic signature backed by verified identification.
As a qualified trust service provider under eIDAS, primesign supports remote signing, PAdES formatting and qualified timestamps, so your online contracts stay legally sound and verifiable over time.
Ready to sign a contract online without the print-and-scan detour?