Hundreds of millions of documents are signed electronically every year across Europe. Employment contracts, commercial agreements, customer onboarding, NDAs, loan agreements… Paper is no longer the standard, and the tool managing that digital flow is called an electronic signature platform.
But not all are equal. In this article we explain what an electronic signature platform actually is, what separates the good ones from the mediocre and which criteria to prioritise before choosing.
What is an electronic signature platform?
An electronic signature platform is specialised software that allows you to create, send, sign and archive documents with legally valid electronic signatures — without printing, scanning or sending emails with attachments.
It goes far beyond "drawing your signature on screen". A professional platform manages the entire document lifecycle:
- Preparation — document upload, signature field placement, signer assignment.
- Sending — notification by email or SMS to each signer with a unique secure link.
- Signing — the signer accesses without needing to create an account, verifies their identity and signs.
- Audit trail — immutable record of every action with RFC 3161 timestamp.
- Archiving — storage of the signed document and evidence certificate.
Features every professional electronic signature platform must have
Support for eIDAS signature levels
The eIDAS Regulation defines three signature levels (Simple, Advanced and Qualified). A serious platform must support at least Advanced Electronic Signature (AES), which is the standard required for B2B contracts, HR and real estate.
| Feature | Basic | Professional | Enterprise | |---|---|---|---| | Simple Electronic Signature | ✅ | ✅ | ✅ | | Advanced Electronic Signature | ❌ | ✅ | ✅ | | Qualified Electronic Signature | ❌ | Optional | ✅ | | RFC 3161 audit trail | ❌ | ✅ | ✅ | | Identity verification | ❌ | ✅ | ✅ | | REST API | ❌ | ✅ | ✅ | | Multiple signers / order | ❌ | ✅ | ✅ |
RFC 3161-sealed audit trail
The audit trail is not a "security extra": it is the primary evidential element if a contract ends up in litigation. It must include:
- IP address and device of every access
- Signer identity verification (confirmed email, SMS OTP, or identity document)
- SHA-256 hash of the document before and after signing
- RFC 3161 timestamp issued by a recognised Time Stamping Authority (TSA)
See our guide on the legal framework for electronic signatures in Europe to understand why RFC 3161 sealing is critical.
Integrated identity verification
A signature without identity verification is hard to challenge but also hard to prove. The best platforms offer:
- Email OTP — the signer confirms a code sent to their inbox.
- SMS OTP — code to the mobile phone.
- Video identification — recording of the signer showing their ID document.
- eID / digital certificate — for qualified signatures.
REST API and webhooks
If your company has a CRM, ERP, HRMS or any internal system that generates documents, you need a platform with a well-documented API. The most common use cases:
- Automatic contract generation from the CRM when a sale is closed.
- Bulk salary amendment dispatch from the HRMS.
- SEPA mandate signing in the customer onboarding flow.
- Integration with your document management system (DMS).
Templates and signature fields
Templates let you define once the structure of each document type (who signs where, what fields to fill) and reuse it indefinitely. Essential for standardised contracts.
Legally valid storage and archiving
Signed documents must be stored with long-term integrity guarantees. Look for platforms with:
- Encrypted storage (AES-256 at rest, TLS 1.3 in transit).
- Document custody sealed with timestamp.
- Export at any time (avoid vendor lock-in).
- Configurable retention policies.
Criteria for choosing an electronic signature platform
1. Legal compliance and certifications
Verify that the platform complies with:
- eIDAS — AES support as a minimum.
- GDPR — personal data processing with legal basis, DPA available, servers in the EU.
- ISO 27001 — information security management.
- SOC 2 Type II — externally audited security controls.
2. Signer experience
The signer — often your customer or employee — should not need to create an account to sign. Key points:
- Access via unique link from email or SMS.
- Mobile-compatible without requiring an app.
- Process completed in under 2 minutes.
- Supports multiple languages.
3. Pricing and billing model
The most common pricing models are:
- Per sent document — ideal if volume is irregular.
- Per user/month — better if you have a consistent team sending documents.
- Per API call — for high-volume integrations.
Be wary of platforms that charge for storage of already-signed documents: it is a form of data retention that can become very expensive.
4. Support and SLA
For legal and technical support questions, having responsive support with knowledge of EU regulations (eIDAS, GDPR) makes a real difference.
5. Activation time and learning curve
A professional platform should be operational — with the first document sent — in under 30 minutes. If it requires weeks of implementation for basic use cases, that is a sign of unnecessary complexity.
Sectors with highest adoption of electronic signature platforms
Human Resources
The department with the highest immediate ROI: employment contracts, salary amendments, internal policies, NDAs, termination documents. Written-form requirements in EU labour codes are satisfied by electronically signed digital documents.
Real Estate
Lease agreements, purchase offers, mortgage documentation. Advanced signature is sufficient for the vast majority of transactions; only deeds of conveyance before a notary require notarial intervention or QES.
Legal and Corporate
NDAs, service agreements, investment agreements, board minutes. The most efficient law firms have eliminated paper from their standard operations.
Fintech and Banking
SEPA mandates, loan agreements, account openings, product amendments. Sector-specific regulation (PSD2, national central bank rules) is compatible with advanced signatures for most operations.
Healthcare
Informed consents, supplier contracts, clinical trial documentation. For patient health data in the EU, the GDPR adds special requirements as a special category of data.
Common mistakes when choosing an electronic signature platform
Mistake 1: Going for the cheapest option without reviewing the audit trail. An electronic signature that does not generate a timestamp-sealed audit trail is worthless in court. The cost of litigation far exceeds any savings on licences.
Mistake 2: Not reviewing where data is stored. The GDPR requires that EU citizens' data does not leave the EU without adequate safeguards. Verify that servers are in the EU or that a valid international transfer agreement (SCCs) is in place.
Mistake 3: Ignoring the signer experience. If the signer needs to download an app, create an account or go through a confusing process, abandonment rates soar. Measure average signing time before committing to a platform.
Also read: How to sign a PDF electronically · Is electronic signature legal in Europe?