Aadhaar-Based e-Sign — How to Use Online

Aadhaar-based e-Sign is a free, paperless way to digitally sign documents online using your Aadhaar number and an OTP sent to your registered mobile number. It is legally valid under the Information Technology Act, 2000, and eliminates the need for a physical Digital Signature Certificate (DSC) token.

Disclaimer: CitizenNest is an independent informational website. We are not affiliated with UIDAI, CCA, or any government body. Always verify details on official government websites.

What is Aadhaar e-Sign?

Aadhaar e-Sign (also called eSign Online Electronic Signature Service) is a service that allows any Aadhaar holder to digitally sign electronic documents. Instead of purchasing a USB-based DSC token, you simply authenticate yourself using Aadhaar OTP or biometrics, and a temporary digital signature certificate is generated and applied to the document instantly.

The service is governed by the Controller of Certifying Authorities (CCA) under the Ministry of Electronics & Information Technology (MeitY) and uses Aadhaar e-KYC for identity verification.

Key features:

• Legally valid under the IT Act, 2000
• OTP-based — no hardware token needed
• Instant — signature is applied in seconds
• Secure — signing keys are destroyed immediately after use
• Works online — sign from anywhere using a browser or app

How Does e-Sign Work?

The e-Sign process involves three parties:

1. You (the signer) — the person signing the document
2. Application Service Provider (ASP) — the website or app where you sign (e.g., Income Tax portal, MCA portal)
3. e-Sign Service Provider (ESP) — the licensed backend provider that handles the actual signing (e.g., eMudhra, Protean/NSDL, C-DAC)

Here is how it works:

1. You open a document on an ASP platform that supports e-Sign.
2. You choose "e-Sign with Aadhaar" and enter your Aadhaar number.
3. An OTP is sent to your Aadhaar-linked mobile number.
4. You enter the OTP to authenticate your identity via Aadhaar e-KYC.
5. A temporary Digital Signature Certificate (valid for 30 minutes) is generated.
6. The document is digitally signed using this certificate.
7. The signing keys are destroyed immediately after use.

The entire process takes less than 2 minutes.

Who Can Use e-Sign?

To use Aadhaar-based e-Sign, you need:

• A valid Aadhaar number
• A mobile number linked to your Aadhaar (required to receive OTP)
• Access to the internet and a device (computer, phone, or tablet)

There are no age restrictions or fees for the end user in most cases — the ASP (application provider) typically bears the cost.

If your mobile number is not linked to Aadhaar, you must update it first. See our Aadhaar card guide for instructions on updating your Aadhaar details.

Where is e-Sign Used?

Aadhaar e-Sign is widely used across government and private platforms:

If a platform says "Sign with Aadhaar" or "e-Sign," it is using this service.

Step-by-Step Process to Use e-Sign

Since e-Sign is integrated into various platforms, the exact steps may vary slightly. Here is the general process:

Step 1: Open the Document

Log in to the platform (e.g., Income Tax portal, MCA portal) and navigate to the document that requires your signature.

Step 2: Select e-Sign Option

Click on "e-Sign" or "Sign with Aadhaar" button. The platform will redirect you to the e-Sign gateway.

Step 3: Enter Aadhaar Number

Enter your 12-digit Aadhaar number in the field provided. You may also need to check a consent box allowing Aadhaar e-KYC verification.

Step 4: Receive OTP

An OTP will be sent to your Aadhaar-linked mobile number. This is not the mobile number registered on the platform — it must be the one linked with UIDAI.

Step 5: Enter OTP

Enter the 6-digit OTP within the time limit (usually 3–10 minutes depending on the platform).

Step 6: Document is Signed

Once the OTP is verified, the system generates a temporary digital certificate, signs the document, and destroys the signing key. You will see a confirmation message.

Step 7: Download or Verify

Download the signed document (usually a PDF). The digital signature can be verified using any standard PDF reader like Adobe Acrobat.

e-Sign Fees

For end users, e-Sign is typically free — the cost is borne by the Application Service Provider (ASP).

For businesses and ASPs, e-Sign Service Providers charge per-signature fees based on volume. These rates vary by provider and are negotiated directly. Common ESPs include:

• eMudhra Ltd. — emudhra.com
• Protean (formerly NSDL e-Gov) — protean-tinpan.com
• C-DAC — cdac.in
• Capricorn Identity Services
• Verasys

The full list of empanelled ESPs is available at cca.gov.in/service-providers.html.

e-Sign vs Digital Signature Certificate (DSC)

For most individuals, e-Sign is sufficient. If you sign documents frequently or need a Class 3 DSC for tenders and audits, see our Digital Signature Certificate guide.

Important Tips

1. Keep your mobile number updated in Aadhaar. If your Aadhaar-linked mobile is inactive or changed, e-Sign will not work. Update it at the nearest Aadhaar centre.

2. Use a stable internet connection. OTP delivery and signing happen in real time. A poor connection may cause timeouts.

3. Do not share your OTP. The Aadhaar OTP is sent only to you. Never share it with anyone, including agents or middlemen.

4. Check the document before signing. Once signed, the document is legally binding. Review every page carefully.

5. Verify the signed document. After signing, open the PDF in Adobe Acrobat Reader and check that the digital signature is valid.

6. e-Sign is not the same as a scanned signature. A scanned image of your signature has no legal standing. e-Sign creates a cryptographically verifiable digital signature.

Related Guides

• Aadhaar eSign — How to Digitally Sign Documents Online
• 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)

Q1: Is Aadhaar e-Sign legally valid?

Yes. Aadhaar e-Sign creates a digital signature under the Information Technology Act, 2000. It is legally equivalent to a handwritten signature for electronic documents.

Q2: Is e-Sign free for individuals?

In most cases, yes. When you e-Sign on government portals like Income Tax or MCA, there is no charge to you. The platform pays the e-Sign Service Provider.

Q3: Can I use e-Sign without Aadhaar?

No. e-Sign specifically relies on Aadhaar e-KYC for identity authentication. Without a valid Aadhaar with a linked mobile number, you cannot use this service. You may need to use a Digital Signature Certificate instead.

Q4: What if I don't receive the OTP?

Check that your mobile number is linked to Aadhaar. If the number is correct but OTP is delayed, wait a few minutes and retry. Network issues, DND settings, or UIDAI server load can cause delays.

Q5: Can e-Sign be used for property registration?

It depends on your state government. Some states have started accepting e-Sign for property-related documents, but many still require a traditional DSC or physical signature. Check with your local sub-registrar office.

Q6: How do I verify an e-Signed document?

Open the signed PDF in Adobe Acrobat Reader. The signature panel will show the signer's details, the Certifying Authority, and whether the document has been modified after signing.

Q7: Is e-Sign safe and secure?

Yes. The signing keys are generated on secure servers and destroyed immediately after the document is signed. Your Aadhaar biometric data is never stored by the e-Sign Service Provider. The entire process uses encrypted communication.

Official Links

• CCA e-Sign page: https://cca.gov.in/eSign.html
• List of e-Sign Service Providers: https://cca.gov.in/service-providers.html
• UIDAI (Aadhaar): https://uidai.gov.in

Last updated: February 18, 2026

Related Aadhaar Guides

• Aadhaar eSign — How to Digitally Sign Documents Online
• 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