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Aadhaar Digital Signature
Verify Aadhaar digital signatures on your phone.
Check whether the digital signature on your e-Aadhaar — or any digitally signed PDF — is genuine and the document unchanged, right on Android, iPhone and iPad. It works offline, nothing is uploaded, and it's free on phones and tablets.
Android · iPhone · iPad · Mac · Web — no Aadhaar number or OTP needed, and the apps work offline
What it checks
A full signature check, the way desktop PDF software does it.
e-Aadhaar letters are signed with a certificate that chains to the Controller of Certifying Authorities (CCA) India root. Many PDF readers don't recognise that root, so they show "Validity Unknown". Pyrbit PDF includes the CCA India root certificates and checks the signature for you.
Document unchanged
Confirms that the signed content hasn't been altered since it was signed.
Signature is genuine
Verifies the cryptographic signature embedded in the PDF.
Signer traced to CCA India
Builds the certificate chain to the CCA India roots as they stood when the document was signed.
Offline and private
Runs entirely on your device. Your Aadhaar document is never uploaded or changed.
How it works
Check a signature in under a minute.
Open the tool
In Pyrbit PDF, go to Protect & Sign › Aadhaar Digital Signature and choose a signed PDF — for example an e-Aadhaar downloaded from UIDAI or DigiLocker. If the file has a password, enter it; it is used only to open the file.
The app checks the signature on your device
Pyrbit PDF reads the digital signature embedded in the file and confirms that the signed content hasn't changed and that the signature is mathematically valid.
It checks who signed
The signer's certificate is traced back to the Controller of Certifying Authorities (CCA) India root certificates built into the app, as they stood at the time of signing.
You see the result on the page
Green for a valid signature, yellow when the document is intact but the signer can't be confirmed, red when the document was changed or the signature is broken. Your file is never modified.
Optional: trust a signer on this device
If a signature is intact but its signer isn't recognised, you can choose to trust that signer's certificate on your device only. The full check then runs again and turns green only if it genuinely passes.
Results
What the result means.
Valid
The document hasn't changed since signing, the signature is genuine, and the signer's certificate chains to a trusted root such as CCA India.
Validity unknown
The document is intact and the signature is mathematically correct, but the signer's certificate can't be traced to a trusted root.
Invalid
The document was modified after it was signed, or the signature is broken. Treat its contents with caution.
Signing
Sign with a certificate you already have.
On Android, you can also sign a PDF with your own digital certificate — for example a Class 3 DSC exported as a .pfx or .p12 file — and place a visible "Digitally signed by" stamp. On iPhone and iPad, you can sign with a personal certificate or a hardware security key from the Verify Signature tool.
What you need to verify
Just the signed PDF, and its password if it has one. No internet, Aadhaar number, OTP or account.
What you need to sign
Your own certificate with its private key (.pfx/.p12 and its password), or a personal certificate created in the app.
Protected while signing
A document that has no signatures yet is encrypted with AES-256 first and then signed, so the signature covers the protected file.
Checked straight away
After you sign, the app verifies your new signature immediately.
Good to know
Clear about what it does — and doesn't.
- It isn't Aadhaar eSign. Aadhaar eSign is an online service run by licensed eSign Service Providers using an OTP sent to your Aadhaar-linked mobile. Pyrbit PDF doesn't connect to UIDAI or any eSign provider and never asks for your Aadhaar number or an OTP.
- Legal standing depends on the certificate, not the app. Under India's Information Technology Act, 2000, a digital signature has legal standing when it is made with a certificate from a CCA-licensed Certifying Authority, or through Aadhaar eSign from a licensed provider. A personal certificate created in the app proves a file hasn't changed since you signed it, but others will see it as "Validity Unknown".
- The check is about the file in front of you. A valid result in Pyrbit PDF doesn't change how other PDF readers display the document, and the app doesn't currently check certificate revocation lists or trusted timestamps.
- Also in your web browser. On a computer, open Aadhaar Digital Signature at pdf.pyrbit.com. The same check runs in your browser against the CCA India root certificates, and you can sign with a .pfx or .p12 certificate. Your file isn't uploaded. Sign in with a Google account: one free document every 24 hours, or Pyrbit Pro (₹79/month or ₹599/year) for unlimited use.
- Independent app. Pyrbit PDF is not affiliated with or endorsed by UIDAI, the CCA or the Government of India.
FAQ
Aadhaar digital signature questions.
Is this the same as Aadhaar eSign?
No. Aadhaar eSign is an online service run by licensed eSign Service Providers, which confirm your identity with an OTP sent to your Aadhaar-linked mobile. Pyrbit PDF does not connect to UIDAI or any eSign provider and never asks for your Aadhaar number or an OTP. It verifies existing signatures and lets you sign with a certificate you already have.
Why does my e-Aadhaar show 'Signature Not Verified' or 'Validity Unknown' in some PDF readers?
e-Aadhaar is signed with a certificate that chains to the Controller of Certifying Authorities (CCA) India root. Many readers don't trust that root by default, so they cannot confirm the signer. Pyrbit PDF bundles the CCA India root certificates and checks the signature on your device. If the document is untouched and the chain is valid, it shows the signature as valid.
Does verification need internet or upload my document?
No. Verification runs entirely on your phone, tablet or Mac, using certificates bundled in the app and the certificate embedded in the PDF. Your document is not uploaded and is not modified. On the web at pdf.pyrbit.com, the check runs inside your browser in the same way — the file still isn't uploaded (the web page itself needs a connection to load).
Can I sign a PDF with my Class 3 DSC?
On Android, yes, if you have it as a .pfx or .p12 file with its password. The app adds a visible signature stamp and a standard PKCS#7 digital signature. USB tokens are not supported on Android. On iPhone and iPad, this tool currently verifies only; you can sign with a hardware security key (PIV) or a personal certificate from the Verify Signature screen.
Is a signature made in the app legally valid?
The legal standing depends on the certificate, not the app. Under India's IT Act, a digital signature counts when it is made with a certificate from a CCA-licensed Certifying Authority, or through Aadhaar eSign from a licensed provider. A personal self-signed certificate created in the app proves the file hasn't changed since you signed it, but others will see it as 'Validity Unknown'.
Why does the app ask me to set a password when I sign?
For a document that has no signatures yet, the app encrypts it with AES-256 first and then signs it. That way the signature covers the protected file, and the password is needed to open it. Files that are already signed are saved as they are, because re-encrypting would break the existing signatures.
What does 'Trust this signer' do?
It adds the certificate already embedded in that PDF to a trusted list on your device only, then repeats the full check. A signature turns green only if the check passes; a tampered document stays red. Trusting a signer never changes the file.
Check your e-Aadhaar signature today.
Free on Android phones, tablets, iPhone and iPad, and available in your web browser — along with 40+ other PDF tools.