October 22, 2026
In Adobe's world, "digital signature" means a certificate-backed cryptographic signature — distinct from the drawn or typed e-signature most users start with. Adobe Sign supports both, with certificate options ranging from self-signed credentials to CA-issued ones; the difference decides what the signature proves and who will accept it.
The two things Adobe calls signing
Electronic signatures — the drawn, typed, or clicked mark with an audit trail behind it. Legal under Singapore's ETA for most commercial documents; evidence rests on the platform's record.
Digital signatures — a cryptographic seal: the document hash signed with a private key whose certificate identifies the signer. Evidence rests on math anyone can rerun, plus the certificate's vetting. The mechanics are covered in What's a Digital Signature? Definition and Use.
Most Adobe Sign users only ever meet the first. The second is where certificate options begin.
Adobe's certificate options compared
| Option | What it proves | Where it fits |
|---|---|---|
| Self-signed certificate | The keyholder signed — identity unvetted | Testing, internal marks |
| Adobe-approved CA credentials | CA-vetted identity, trusted chains | EU-style qualified flows, regulated docs |
| Document signing certificates | Organization-bound signing | Sealing company-issued documents |
The vetting question is the operative one — a certificate proves exactly what its issuer checked. Self-signed credentials prove key possession and nothing else; the risks are detailed in Is a Self-Signed Certificate Secure for Business Contracts?.
Where the options thin out for Singapore teams
Regional trust frameworks are not the native story. Adobe's certificate ecosystem centers on EU and US trust lists. Singapore signers expecting Singpass-grade identity, or regional counterparties expecting locally recognized credentials, find the options pointed elsewhere.
Certificates without operational support. Getting a credential is step one; issuance, custody, revocation, and timestamping are the daily work. Buying certificates without managed infrastructure recreates the PKI project most teams were trying to avoid — the operational anatomy is in Purpose of a Digital Certificate.
The pricing stack. Certificate-backed signing on Adobe sits in upper plans and add-ons, on top of per-seat licensing. The certificate option you can afford drifts below the one your documents call for.
What to compare instead
For Singapore teams that need certificate-grade signing, the comparison shortlist should test three things: native regional authentication (Singpass), managed certificate operations (custody through revocation, no in-house PKI), and pricing that does not stack per-seat fees on certificate add-ons. The vendor-evaluation framework is in Electronic Signature Vendors: A Buyer Evaluation Framework, and the certificate-authority layer — including how Singapore's own CA ecosystem fits — in Certificate Authorities in Hong Kong: A Signer's Guide (the CA mechanics translate directly).
Certificate Signing, Managed and Regional: Nota Sign
Ask anyone who has run certificates in-house what the job actually is. Monday: a new hire needs a credential issued. Wednesday: someone left, and their key needs revoking before lunch. Friday: an auditor wants proof that last quarter's signatures still verify. None of that is signing — it is operations, and it is where certificate programs live or die.
Nota Sign runs that week for you. Recognized CA credentials plug in or issue through the platform; custody is hardened and gated by per-signer identity proofing; chains, revocation, and trusted TSA timestamps are maintained centrally; and every certificate-backed signature exports with an evidence package — signed document, audit trail, consent records, identity events, chain data — that any verifier can check offline years later. Where Adobe and DocuSign stack certificate features onto upper plans and per-seat licenses, Nota Sign opens the certificate path on every plan and bills no per-seat fees at all — occasional signers never price out of certificate-backed flows. Small teams start on a low-cost package; mid-market and enterprise buyers negotiate tailored plans.
For Singapore teams, the trust roots are regional: Singpass authentication, iAM Smart in Hong Kong, data residency in-region, and a Singapore–China corridor where your counterparty executes under PRC rules while your side signs under the ETA — one chain-bound record for both. Nota Sign comes from FaDaDa, China's leading e-signature vendor, and the coverage runs to more than 100 countries and regions — ESIGN and UETA in the US, eIDAS (SES, AES, QES) in the EU — on SOC 2 Type II-audited infrastructure. Both signature classes — standard electronic and X.509-backed digital — run in the same envelope flow.
If a counterparty or regulator is asking for certificate-backed signatures, contact sales with the requirement and we will show you the custody and CA model that fits it on a real document.
