Aadhaar eSign vs DSC: What's the Difference?

India has two mainstream ways to sign digitally: Aadhaar eSign (an OTP-based online signature) and a Digital Signature Certificate (DSC) on a USB token. Both are legally valid — but they are built differently, cost differently, and are accepted in different places. Here is the clear comparison.

What is Aadhaar eSign?

Aadhaar eSign lets you sign a document online in seconds using your Aadhaar number and an OTP sent to your Aadhaar-linked mobile. Behind the scenes, an eSign Service Provider verifies you through Aadhaar e-KYC and issues a one-time certificate that signs that specific document and is then destroyed. There is no USB token, no software to install and nothing to carry — you can sign from a phone. It is designed for agreements, loan and NBFC documents, HR paperwork, rent agreements and consent forms.

What is a DSC?

A Digital Signature Certificate is a Class 3 certificate issued by a CCA-licensed Certifying Authority after PAN-based identity and video verification, stored on a secure USB token. It is valid for 1–3 years and signs unlimited documents in that period. Government portals are built around it: MCA/ROC filings, GST (mandatory for companies and LLPs), Income Tax audit cases, DGFT, e-tenders and GeM all require the token-based DSC.

eSign vs DSC — the practical differences

The two differ on five things that actually matter:

• Identity check: eSign = Aadhaar OTP each time you sign. DSC = one-time PAN + video verification when the certificate is issued.
• What you hold: eSign = nothing (certificate lives and dies with the transaction). DSC = a physical USB token you plug in to sign.
• Validity: eSign = that one document. DSC = 1–3 years of unlimited signing.
• Cost model: eSign = pay per signature. DSC = pay once for the certificate + token; see current DSC prices.
• Where it's accepted: eSign = business documents between private parties. DSC = everywhere eSign works plus the government portals that mandate it.

Can eSign replace a DSC?

For government portals — no. MCA, GST (companies/LLPs), DGFT, e-tender and GeM specifically require a Class 3 DSC; an Aadhaar eSign will not work there. For private business documents — yes, eSign is usually the faster and cheaper choice, since the other party doesn't need a token either. Most businesses end up using both: a DSC for compliance filings, eSign for day-to-day agreements. If you're unsure which certificate your work demands, start with which DSC do you need.

Which should you choose?

Choose a DSC if you (or your clients) file on any government portal, bid on tenders, or sign frequently — the per-signature economics beat eSign quickly, and it's the only option the portals accept. A Class 3 Organisation certificate covers a company's filings; individuals use Class 3 Individual. Choose eSign for occasional, person-to-person signing where speed matters more than a reusable certificate. Getting a DSC is fully online and same-day.

Frequently asked questions