Electronic Seal vs Electronic Signature: When to Use Each

A qualified electronic seal enjoys the presumption of data integrity and origin. This means the data sealed with a QSeal is presumed to be authentic and unaltered — the strongest organisational evidence under EU law.

A sealed document does not replace a signature — it complements it. A contract might be signed by an individual (QES) and sealed by the organisation (QSeal). The signature proves personal intent; the seal proves organisational origin.

The concept of electronic seals is less formalised outside the EU. In China, organisational certificates serve a similar function. In Singapore, the ETA does not explicitly distinguish seals from signatures.

Human signature (QES): 30 seconds - 5 minutes per signer (identity verification + review + sign). Electronic seal (QSeal): 0.8-2 seconds per seal via API. For 10,000 product compliance certificates, sealing takes 3-5 hours vs 40+ days of human signing.

EU DPP (Digital Product Passport): QSeal required, human signature NOT accepted. eIDAS Article 36 allows seals as equivalent to handwritten signatures for legal entities. China Electronic Signature Law: seals (电子印章) are legally equivalent to physical company chops. US FDA 21 CFR Part 11: electronic signatures (not seals) required — the regulation does not distinguish individual vs organisational signatures.

A common enterprise pattern is: human signer signs first (AES or QES), then the organisation applies its seal (QSeal) to the completed document. This provides both individual accountability (who approved this?) and organisational guarantee (which entity stands behind this?). eSign.AI supports this dual-signing pattern natively — after all human signers complete, the system can automatically apply the organisational seal.

For machine-generated documents (compliance certificates, regulatory reports, product passports, batch records), QSeal alone is sufficient and appropriate. Examples: automotive eCoC (XML data sealed and submitted to authorities), DPP product data (sealed at manufacturing time), batch release records (sealed by MES system). eSign.AI's XML SDK and REST API enable fully automated sealing without human intervention.

Certain documents require individual human signature under law: personal guarantees, wills, powers of attorney, consumer credit agreements (EU Consumer Credit Directive), and employment contracts (most jurisdictions). A seal alone cannot satisfy these requirements because the seal represents the organisation, not the individual. Always verify which signatory type the law requires before choosing seal-only or signature-only workflows.