Complete Guide to Aadhaar eSign in India
Everything you need to know about Aadhaar-based electronic signatures — legal validity, how it works, eligible documents, cost comparison, and step-by-step guide.
1.4B+
Aadhaar holders
IT Act §3A
Legal basis
< 2 min
Signing time
₹15
Cost on SignSetu
Table of Contents
What is Aadhaar eSign?
Aadhaar eSign is an online electronic signature service that allows any Aadhaar holder to digitally sign documents using their Aadhaar number and a one-time password (OTP) sent to their Aadhaar-linked mobile number. It was introduced under Section 3A of the Information Technology Act, 2000 (added by the IT Amendment Act, 2008) and is governed by the IT (Electronic Signature) Rules, 2015 issued by MeitY.
Unlike a scanned signature (which is just an image with no legal standing) or a Digital Signature Certificate (DSC, which requires a USB token), Aadhaar eSign creates a cryptographic digital signature backed by government-verified identity. The entire process takes under 2 minutes and requires no hardware, no software installation, and no in-person verification.
The ecosystem is overseen by the Controller of Certifying Authorities (CCA) under MeitY, with only 7 licensed eSign Service Providers authorised to facilitate Aadhaar eSign transactions in India.
How Does Aadhaar eSign Work?
For the end user
- Upload your PDF document to an eSign platform (like SignSetu)
- Add signers — each needs an Aadhaar number and linked mobile
- Signers receive an email invitation
- Each signer enters their Aadhaar number and receives an OTP
- OTP is verified by UIDAI — document is digitally signed
- Signed PDF with cryptographic audit trail is delivered to all parties
Technical architecture
The Aadhaar eSign ecosystem involves three key players:
Aadhaar eSign Architecture
You
Uploads PDF, enters OTP
ASP (SignSetu)
Document workflow
ESP (eMudhra)
Cryptographic signing
UIDAI
Aadhaar authentication
ASP (Application Service Provider) is the platform you interact with — like SignSetu. It handles document upload, signer management, and delivery. ESP (eSign Service Provider) is the licensed Certifying Authority that performs the actual signing — like eMudhra.
Is Aadhaar eSign Legally Valid in India?
Yes, unequivocally. Aadhaar eSign carries the same legal weight as a handwritten signature for all documents that are not excluded under Schedule I of the IT Act.
Legal framework
- Section 3A, IT Act 2000 — recognises electronic signatures as legally valid
- IT (Electronic Signature) Rules, 2015 — prescribes Aadhaar eSign as a valid technique (GSR No. 304(E), April 8, 2015)
- Section 5, IT Act — provides legal recognition to electronic signatures
- Section 65B, Indian Evidence Act / Section 63, Bharatiya Sakshya Adhiniyam 2023 — eSigned documents are admissible as electronic evidence
Government and institutional acceptance
Aadhaar eSigned documents are accepted by banks (RBI Digital Lending Guidelines), insurance companies (IRDAI mandated electronic policies from April 2024), NBFCs, courts (as electronic evidence), and government departments. The signature carries a cryptographic audit trail with a CCA-chain certificate and timestamp, making it independently verifiable.
Which Documents Can Be Signed with Aadhaar eSign?
CAN eSign
| Document | eSign | Template |
|---|---|---|
| Rent Agreement | Download → | |
| NDA | Download → | |
| Offer Letter | Download → | |
| Service Agreement | Download → | |
| NOC | Download → | |
| Experience Letter | Download → | |
| Consultancy Agreement | Download → | |
| Internship Agreement | Download → | |
| Vendor Agreement | Download → | |
| Partnership Deed | Download → | |
| Loan Agreements | — | |
| Insurance Policies | — |
CANNOT eSign (IT Act Schedule I)
- Wills and testamentary dispositions
- Negotiable instruments (cheques, promissory notes, bills of exchange)
- Power of Attorney for immovable property sale/transfer
- Trust deeds under the Indian Trusts Act
- Contracts for sale or conveyance of immovable property
Aadhaar eSign vs DSC vs Electronic Signature
| Feature | Aadhaar eSign | DSC | Simple e-Signature |
|---|---|---|---|
| Legal basis | IT Act §3A | IT Act §3 | Varies |
| Authentication | Aadhaar OTP | USB token + PIN | Email/click/draw |
| Hardware needed | None | USB token | None |
| Cost | ₹15/use | ₹500–2,000/yr | Free–₹750/mo |
| Govt filings | ❌ | ✅ Required | ❌ |
| Contracts/NDAs | ✅ | ✅ (overkill) | ⚠️ |
| Identity proof | Aadhaar (govt ID) | CA verified | Usually none |
| Certificate validity | ~30 minutes | 1–3 years | None |
For most private agreements, Aadhaar eSign provides the same legal validity as a DSC at a fraction of the cost — ₹15 vs ₹500–2,000.
Licensed eSign Service Providers in India
Only 7 organisations are empanelled by the CCA as eSign Service Providers:
- eMudhra Limited — SignSetu's eSign provider
- C-DAC (Centre for Development of Advanced Computing)
- Capricorn Identity Services
- Protean eGov Technologies (formerly NSDL)
- Verasys (Vsign)
- CSC e-Governance Services
- CDSL Ventures Limited
SignSetu is an Application Service Provider (ASP) — we provide the user interface, document management, and signer workflow. The actual cryptographic signing is performed by our ESP partner, eMudhra, which is one of India's largest CCA-licensed Certifying Authorities.
How Much Does Aadhaar eSign Cost?
| Platform | Pricing | Best For |
|---|---|---|
| SignSetu | ₹15/signature | Individuals, SMBs, occasional use |
| DSC Token | ₹500–2,000/year | MCA, ITR, GST filings |
| Enterprise eSign (Digio, Leegality) | ₹750–5,000/month | 100+ docs/month, API access |
| DocuSign | ₹1,000–3,000/month | International, multi-country |
SignSetu is the only platform in India offering pay-per-use Aadhaar eSign without a subscription. See our pricing page for details.
How to eSign a Document Using Aadhaar — Step by Step
- 1
Create a free account
Sign up on SignSetu — no credit card required.
- 2
Buy credits
Purchase signature credits at ₹15 each. Minimum 10 credits. Credits never expire.
- 3
Upload your PDF
Upload the document you need signed. Max 10 MB.
- 4
Add signers
Enter each signer's name, email, and phone number. Set signing order if needed.
- 5
Send for signing
Signers receive an email invitation with a secure signing link.
- 6
Signers verify with Aadhaar OTP
Each signer enters their Aadhaar number and verifies via OTP sent to their linked mobile.
- 7
Download signed document
The signed PDF with cryptographic audit trail is delivered to all parties.
Aadhaar eSign by Use Case
Rent Agreements
The most common use case. Sign 11-month Leave & Licence agreements with landlord and tenant for ₹30 total (2 signatures). State-specific guides available.
HR & Employment
Offer letters, appointment letters, NDAs, experience letters, relieving letters. HR teams processing 10+ documents per month save significantly with pay-per-use pricing.
Freelancers & Consultants
Service agreements, consultancy contracts, NDAs. Sign remotely with clients anywhere in India.
NRIs
Sign rent agreements, power of attorney (general), affidavits, and business contracts from abroad — as long as your Aadhaar is linked to an active Indian mobile.
Is Aadhaar eSign Secure?
Aadhaar eSign is built on India's Aadhaar eKYC infrastructure, which processes billions of authentication transactions annually. The security architecture includes:
- OTP-based authentication — the OTP is generated and verified by UIDAI, not by the signing platform
- Cryptographic signing — the digital signature uses RSA-SHA256 with a certificate chain back to CCA India's root certificate
- Tamper detection — any modification to the signed PDF is cryptographically detectable
- Timestamp — each signature includes a trusted timestamp from the ESP's Time Stamping Authority
- No Aadhaar storage — SignSetu does not store Aadhaar numbers. The OTP verification is handled directly between UIDAI and the ESP
Common Aadhaar eSign Issues & Solutions
OTP not received
Ensure your mobile number is linked to your Aadhaar. The OTP is sent by UIDAI, not SignSetu. Check signal strength and wait up to 30 seconds.
"Signature Not Verified" in PDF reader
This is normal — Indian CCA root certificates are not pre-installed in Adobe Reader or Chrome. The signature IS valid. Use our verification tool to check.
Aadhaar linked to old mobile number
Update your Aadhaar-linked mobile at an Aadhaar enrolment centre or via the mAadhaar app. This cannot be done online without biometric verification.
Authentication failure
Ensure your Aadhaar number is correct (12 digits, no spaces). If persistent, try again after 30 minutes — UIDAI may have temporary rate limits.
Aadhaar eSign FAQ
Is Aadhaar eSign legally valid?
Yes. Under Section 3A of the IT Act 2000 and the IT (Electronic Signature) Rules 2015, Aadhaar eSign has the same legal standing as a handwritten signature.
How much does it cost?
On SignSetu: ₹15 per signature. No subscription, no monthly fees. Credits never expire.
Do I need a USB token?
No. Aadhaar eSign uses OTP authentication — no hardware, no software, no downloads.
Can NRIs use Aadhaar eSign?
Yes, if your Aadhaar is linked to an active Indian mobile that can receive OTP.
How long does it take?
Under 2 minutes per signer. Upload, verify OTP, done.
Is it accepted by banks?
Yes. RBI Digital Lending Guidelines and IRDAI recognise Aadhaar eSigned documents.
What's the difference between eSign and DSC?
DSC requires a USB token (₹500–2,000/yr) and is needed for government filings. Aadhaar eSign costs ₹15/use and is valid for all private agreements.
Can I verify an eSigned document?
Yes. Use our free PDF Signature Verification Tool or install India's CCA root certificate in Adobe Reader.
See all 37 questions on our comprehensive FAQ page →
Disclaimer
This guide is for informational purposes only and does not constitute legal advice. While we strive for accuracy, laws and regulations change periodically. Consult a qualified legal professional for advice specific to your situation. SignSetu is not responsible for decisions made based on this guide. Last updated: April 2026.
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