You're on the go and need to quickly verify a government PDF on your phone — maybe a DigiLocker document, an Aadhaar letter, or a digitally signed certificate. You open it in Adobe Acrobat Mobile or your phone's built-in PDF viewer and see: "Signature Unknown" or no signature information at all. This is not a problem with your document. It's a limitation of mobile PDF apps.
Mobile PDF readers — whether Adobe Acrobat for Android, PDF Viewer on iOS, or the default document viewers built into Samsung or Xiaomi phones — do not ship with the Indian government's certificate store. Signature verification requires trusting the full chain from the document's signing certificate all the way back to a root CA. Since NIC, eMudhra, Sify, and other Indian CAs are not in these apps' trust stores, signatures simply cannot be validated on-device.
Unlike desktop Adobe Reader, mobile apps don't even offer a way to import root certificates manually. You're completely stuck — unless you use a tool that does the verification for you.
VerifySign.in is a progressive web app that runs entirely in your browser — no app download, no Play Store, no App Store. It works seamlessly on Chrome for Android and Safari for iPhone. The verification happens on VerifySign.in's servers, which hold a complete trusted certificate store for all major Indian government CAs. You simply upload your PDF and get a verified, LTV-enabled PDF back.
Step 1 — Open Chrome on your Android phone and go to verifysign.in.
Step 2 — Tap the upload area. Your phone's file picker will open — navigate to your Downloads folder or wherever the PDF is saved.
Step 3 — Select the PDF and wait a few seconds for VerifySign.in to process it.
Step 4 — View the verification result: signer name, signing date, and document integrity status.
Step 5 — Tap "Download Verified PDF." Chrome will save the file to your Downloads folder automatically. You can find it in the Files app or the Chrome Downloads menu.
Step 1 — Open Safari and navigate to verifysign.in.
Step 2 — Tap the upload area. iOS will show a picker — choose "Browse" to access the Files app, or "Photos" if you've saved the PDF there.
Step 3 — Select your PDF and let VerifySign.in verify it.
Step 4 — Tap "Download Verified PDF." Safari will download the file and you'll see a download indicator in the address bar.
Step 5 — Tap the download indicator, then tap the file to open it. You can save it to the Files app (On My iPhone) or iCloud Drive for easy access later.
After VerifySign.in processes your document, the downloaded PDF contains embedded LTV (Long-Term Validation) data. When you open this PDF in any viewer — even mobile apps — the signature will display correctly. Many mobile apps will now show a basic "Signed" indicator rather than an "Unknown" warning.
• On iPhone: Use the Files app to organise verified PDFs in a dedicated folder. You can long-press the file to share it directly via WhatsApp, email, or AirDrop.
• On Android: Verified PDFs land in your Downloads folder. Use your file manager app to move them to a named folder if you're organising multiple documents.
• Both platforms: VerifySign.in works on any modern browser. If Safari or Chrome behaves unexpectedly, try opening the site in a private/incognito tab and re-uploading.
No app. No sign-up. No configuration. Just open verifysign.in on your phone, upload your document, and download a verified PDF in under 30 seconds.
Instant digital signature verification for any government PDF — free, secure, no software needed.
Go to VerifySign.in →