The premier Android digital signature validation engine. Inspect X.509 certificate chains, authenticate PKCS#7 signatures, and verify document integrity on e-Aadhaar, PAN cards, invoices, and certificates locally without uploading files to any external server.
In today's digital era, official documents such as e-Aadhaar, income tax filings, utility bills, educational certificates, and employment contracts are digitally signed rather than handwritten. When viewed on standard mobile PDF viewers, these documents often display a confusing yellow question mark (?) or state "Signature Not Verified."
PDF Sign Verify - Green Tick bridges this crucial gap on mobile devices. It provides an enterprise-grade cryptographic validation engine that parses standard CMS (Cryptographic Message Syntax) and PKCS#7 digital signature containers embedded inside PDF documents according to the official ISO 32000 specification.
Unlike online web converters or cloud portals that require you to upload your sensitive identity documents to an unknown server, PDF Sign Verify executes all cryptographic hashing, certificate parsing, and signature verification strictly on your device's processor. Your documents never leave your storage.
Follow these quick steps to verify any digitally signed PDF document in seconds:
Launch the application and tap "Select PDF". You can choose any PDF stored in your internal storage, Downloads folder, SD card, or directly import a file from WhatsApp, Google Drive, Gmail, or your file manager using the system document picker.
Once selected, the built-in parser automatically locates the PDF's signature dictionaries, extracts the signed ByteRange, and recalculates the SHA-256 or SHA-1 cryptographic message digest to confirm that no alterations have occurred since the document was signed.
The app presents a comprehensive verification summary displaying:
If the signature is intact and valid, the certified Green Tick confirmation is displayed. You can also export or share a detailed cryptographic audit report for legal, corporate, or archival records.
Engineered with rigorous mathematical standards and lightweight native speed.
Full support for industry-standard Cryptographic Message Syntax (CMS), PKCS#7, and CAdES digital signature formats.
Traverses complete certificate chains from End-Entity through Intermediate Certifying Authorities to Trusted Root CAs.
Computes SHA-256 and SHA-1 checksums over precise ByteRanges to detect unauthorized post-signature alterations.
Functions flawlessly in airplane mode with zero dependency on external servers or internet connectivity.
Pre-configured to recognize signatures issued by India's Controller of Certifying Authorities (CCA), e-Mudhra, NSDL, and CDAC.
Minimal application size, zero bloat, instant startup time, and zero background battery consumption.
Key architectural and system details for users and system administrators.
| Package Identifier | com.pdfsignverify.pdf_sign_verify |
| Minimum Android Version | Android 6.0 (Marshmallow, API 23) or higher |
| Target Android Version | Android 14 (API 34) & Android 15 ready |
| Supported Specifications | ISO 32000-1 / ISO 32000-2, RFC 5652 (CMS), RFC 2315 (PKCS#7) |
| Cryptographic Algorithms | RSA (1024, 2048, 4096-bit), ECDSA, SHA-256, SHA-384, SHA-512, SHA-1 |
| Permissions Required | Read Storage / File Picker (only to access selected PDF document) |
| Cloud Infrastructure | None — Strictly On-Device Local Sandbox |
Answers to common questions regarding PDF digital signature verification on Android.
No, absolutely not. PDF Sign Verify is architected from the ground up as a purely local on-device utility. The document never leaves your phone's memory. All cryptographic hash calculations and certificate validation take place directly on your phone's CPU.
Most standard mobile PDF viewers do not include local cryptographic certificate trust stores or lack automated verification engines for regional Certifying Authorities (such as India's CCA). Because the viewer hasn't verified the certificate chain, it shows an unverified warning. PDF Sign Verify inspects the actual cryptographic signature data to establish true document authenticity.
Yes. If your document (such as an e-Aadhaar or bank statement) is encrypted with a password, the app will securely prompt you to unlock it on your device so the cryptographic signature stream can be extracted and verified.
A scanned signature is merely an image pasted on top of a page and can be easily forged or copied. A true digital signature is mathematical cryptography: it seals the document with a private cryptographic key and creates a tamper-evident ByteRange hash. Any modification after signing breaks the signature mathematically.
Download PDF Sign Verify - Green Tick for free on Google Play and start authenticating your documents with complete privacy.
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