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Signing with MitID: Is Digital Signature Legally Valid?

Everything you need to know about the legal validity, eIDAS regulation, security, and benefits of digital signing with MitID.

Forfatter: Ricco (Founder & Head of Security) Opdateret: 2026-08-30 Læsetid: 5-6 min read
Dekorativ illustration til MitID-signering og juridisk gyldig digital underskrift

Hovedpointer (Key Takeaways)

  • Digital signing with MitID is 100% legally binding and legally equivalent to physical pen signatures under the Danish Contracts Act and the EU eIDAS regulation.
  • MitID provides maximum cryptographic evidence: the signer's verified identity, timestamp, and document hash are permanently embedded in the PDF.
  • Danish companies save significant administrative time and postage costs by switching to digital signing flows with KvikSign.
  • Recipients do not need to install apps or create accounts – they authenticate directly using their standard MitID app.

What is digital signing with MitID?

Digital signing with MitID is an electronic method where private individuals and business signers authenticate their identity using Denmark's national identity scheme (MitID or MitID Business) to sign digital contracts and documents.

Unlike simple image signatures or scanned handwriting, an eID signature with MitID embeds a tamper-proof cryptographic checksum and an audit trail into the PDF file. This guarantees that the document cannot be modified post-signature without invalidating the seal.

Is a digital signature with MitID legally binding?

Yes. Under Danish law (Contracts Act § 1) and European Union eIDAS regulation (EU 910/2014), electronic signatures carry full legal standing.

MitID signing qualifies as an Advanced Electronic Signature (AES) with high identity assurance, providing the strongest burden of proof in Danish courts and arbitration.

Which documents can you sign with MitID?

Virtually all commercial agreements and private contracts can be signed digitally with MitID. Common examples include:

  • Employment contracts, non-disclosure agreements (NDAs), and consultant contracts
  • Commercial lease agreements and tenancy contracts
  • Shareholder agreements, board meeting minutes, and corporate resolutions
  • GDPR Data Processing Agreements (DPA) and compliance declarations
  • Loan documents, promissory notes, and sales purchase agreements

Key benefits of using MitID for document signing

Switching from paper-based signatures to digital MitID signing gives businesses clear operational advantages:

  • Speed: Turnaround time is reduced from days to minutes.
  • Proof of identity: 100% certainty about who actually signed.
  • Security: Encrypted transmission and storage complying with GDPR.
  • Cost savings: No printing, postage, or manual archiving needed.

How it works in practice with KvikSign

With KvikSign, sending a document for signature takes under 60 seconds: upload your PDF, specify the signers, and choose MitID or Touch signature. The signers receive a secure link, verify with MitID, and all parties receive the completed, sealed PDF certificate immediately.

Ofte stillede spørgsmål (FAQ)

Do signers need a KvikSign account to sign?

No. Signers simply click the secure link in the notification email or SMS and approve using their MitID app without any login or account creation.

Is a MitID signature recognized across the EU?

Yes. Under the EU eIDAS regulation, electronic signatures issued through recognized European identity schemes are legally valid across all 27 EU member states.

What happens if someone tries to alter a signed PDF?

The cryptographic certificate and hash in the PDF will instantly register as corrupted, alerting Adobe Reader and any PDF validator that the document has been tampered with.

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