Aadhaar eSign — How to Digitally Sign Documents Online

What is Aadhaar eSign?

Aadhaar eSign is an online electronic signature service that allows any Aadhaar holder to digitally sign documents using OTP (One-Time Password) verification. It is a legally valid way to sign documents without needing a physical Digital Signature Certificate (DSC) dongle.

Unlike a Digital Signature Certificate (DSC) which requires purchasing a USB token, Aadhaar eSign is simple, fast, and works entirely online — you just need your Aadhaar number and a linked mobile number.

Aadhaar eSign is:

• OTP-based — no hardware token or USB dongle needed
• Legally valid — recognized under the IT Act, 2000 and its amendments
• Instant — the entire signing process takes under 2 minutes
• Paperless — no printing, scanning, or courier required

How Does Aadhaar eSign Work?

The Aadhaar eSign process involves three parties — you (the signer), the application service provider (ASP), and UIDAI's authentication system.

Step-by-step flow:

1. You upload a document on a platform that supports Aadhaar eSign
2. The platform redirects you to an eSign service provider (ESP) page
3. You enter your Aadhaar number
4. UIDAI sends an OTP to your Aadhaar-linked mobile number
5. You enter the OTP to authenticate your identity
6. A digital signature is generated and attached to the document
7. The signed document (PDF) is returned to you

The entire process is powered by eSign API developed by C-DAC and governed by the Controller of Certifying Authorities (CCA) under the Ministry of Electronics & IT.

Legal Validity of Aadhaar eSign

Aadhaar eSign is legally valid across India. Here's the legal framework:

Key point: An Aadhaar eSign carries the same legal weight as a wet (physical) signature for most documents. However, some documents like property registration and certain court filings may still require physical signatures or registered DSC as per state-specific rules.

Who Can Use Aadhaar eSign?

Eligibility:

• Any Indian resident with a valid Aadhaar card
• Mobile number must be linked to Aadhaar (for OTP verification)
• No age restriction — minors with Aadhaar can also use eSign (through guardian consent where applicable)

To check if your mobile is linked to Aadhaar, visit the UIDAI portal or see our Aadhaar guide for help.

How to Use Aadhaar eSign — Step-by-Step Process

Method 1: eSign via DigiLocker

DigiLocker is a government platform that supports free Aadhaar eSign.

1. Visit digilocker.gov.in and log in
2. Go to Upload Documents section
3. Upload the PDF you want to sign
4. Click eSign on the uploaded document
5. Enter your Aadhaar number when prompted
6. Enter the OTP received on your Aadhaar-linked mobile
7. The document is signed and stored in your DigiLocker
8. Download the eSigned PDF

Cost: Free

Method 2: eSign via Leegality

Leegality is a popular private platform for eSigning legal documents.

1. Visit leegality.com and create an account
2. Upload your document (PDF, Word, or image)
3. Add signature fields where required
4. Choose Aadhaar eSign as the signing method
5. Enter your Aadhaar number
6. Verify with OTP
7. Download the signed document

Cost: Free for basic use; paid plans for bulk signing (₹5–15 per signature on business plans)

Method 3: eSign via SignDesk

SignDesk is an enterprise-grade eSigning platform.

1. Visit signdesk.com and register
2. Upload the document to be signed
3. Add signatories and place signature fields
4. Select Aadhaar eSign option
5. Signatories receive an email/SMS with the signing link
6. Each signer authenticates via Aadhaar OTP
7. Signed document is emailed to all parties

Cost: ₹5–15 per eSign (varies by plan)

Method 4: eSign on eStamp/eRegistration Portals

Many state government portals for rent agreements and stamp duty now support Aadhaar eSign directly:

1. Visit your state's eStamp or eRegistration portal
2. Fill in the agreement/document details
3. Pay stamp duty online
4. At the signing stage, choose Aadhaar eSign
5. Both parties authenticate with Aadhaar OTP
6. The eSigned, eStamped document is generated

Cost: Free (only stamp duty charges apply)

Cost of Aadhaar eSign

Common Use Cases for Aadhaar eSign

1. Rent Agreements — Sign rental agreements online without visiting a registration office
2. Affidavits — eSigned affidavits for court, school admission, or government applications
3. Loan Documents — Banks and NBFCs use Aadhaar eSign for paperless loan processing
4. Company Registration — MCA filings and incorporation documents
5. Insurance Policies — Policy documents and claim forms
6. Employment Contracts — Offer letters and NDAs
7. ITR & Tax Documents — e-Verification of income tax returns
8. GST Registration — Application signing

Aadhaar eSign vs Digital Signature Certificate (DSC)

For more on DSC, see our Digital Signature Certificate guide.

Important Tips

1. Keep your mobile number updated in Aadhaar — eSign requires OTP on your Aadhaar-linked number
2. Check document carefully before signing — an eSigned document is legally binding
3. Use government platforms (DigiLocker, state portals) for free eSigning whenever possible
4. Download and save the eSigned document immediately after signing
5. Aadhaar eSign works on mobile — no desktop or special software required

Related Guides

• Aadhaar e-Sign — Sign Documents Online in 2 Minutes
• DigiLocker Aadhaar Already Registered Error — Fix Now
• Aadhaar Card Common Problems & Solutions
• How to Download e-Aadhaar Card PDF Online — Step-by-Step Guide
• How to Check Aadhaar Card Update Status Online

Frequently Asked Questions (FAQs)

Is Aadhaar eSign legally valid in India?

Yes. Aadhaar eSign is legally valid under Section 3A of the IT Act, 2000. It is recognized by courts, government departments, banks, and all regulatory bodies in India.

Can I use Aadhaar eSign without a linked mobile number?

No. Aadhaar eSign requires OTP verification, which is sent to your Aadhaar-linked mobile number. If your mobile is not linked, visit an Aadhaar enrollment center to update it.

Is Aadhaar eSign free?

On government platforms like DigiLocker and state eStamp portals, Aadhaar eSign is free. Private platforms like Leegality and SignDesk charge ₹5–15 per signature on their paid plans.

Can Aadhaar eSign be used for property registration?

It depends on the state. Some states like Maharashtra, Karnataka, and Rajasthan allow eSigned rent agreements and leave & license agreements. However, sale deed registration typically still requires physical presence and biometric verification at the Sub-Registrar office.

How many times can I use Aadhaar eSign?

There is no limit on the number of times you can use Aadhaar eSign. Each signing session generates a fresh OTP.

Can NRIs use Aadhaar eSign?

Yes, as long as they have a valid Aadhaar number with a linked Indian mobile number that can receive OTP. NRIs with foreign mobile numbers linked to Aadhaar may face issues receiving OTP.

Is Aadhaar eSign the same as Digital Signature?

Not exactly. Aadhaar eSign is a type of electronic signature that uses Aadhaar OTP for authentication. A Digital Signature Certificate (DSC) uses a cryptographic USB token. Both are legally valid, but they use different technology. See the comparison table above.

Can a company use Aadhaar eSign for business documents?

Yes. Many companies use Aadhaar eSign for HR documents, vendor agreements, and customer onboarding. Platforms like Leegality and SignDesk offer business plans with bulk eSigning capabilities.

This guide is for informational purposes only. CitizenNest is an independent platform and is not affiliated with UIDAI or any government body. Always verify the latest rules on official government websites.

Related Aadhaar Guides

• Aadhaar e-Sign — Sign Documents Online in 2 Minutes
• Aadhaar Card Common Problems & Solutions
• How to Apply for Aadhaar Card Online — Step-by-Step Guide
• Aadhaar OTP Not Coming? 8 Quick Fixes for Mobile & Email OTP
• How to Check Aadhaar Card Update Status Online