Cryptographically seal your PDF documents locally using USB Tokens (ProxKey, ePass2003, mToken, Watchdata, TrustKey). Fully compliant with the Indian IT Act 2000 and Adobe LTV standards.
Document E-Signer
Please insert your DSC USB Token (ProxKey, ePass2003, etc.) to begin.
Select the documents to cryptographically seal
with your digital signature.
Signing will apply a legally binding cryptographic seal using your DSC.
Annexure B-1
Name of work - Providing vehicle leasing services for the corporate office, to be operated under the control of the Procurement Division and billed to the Administration Department for a period of one year.
A native desktop engine built around your hardware token — no browser plugins, no cloud upload, no compromise on the cryptography.
Talks directly to ProxKey, ePass2003, mToken, mToken CryptoID, Watchdata, and TrustKey devices over PKCS#11 — your private key never leaves the token.
Seal a 1-page letter or a 145-page tender in one pass, with per-page or custom-range placement rules.
No document ever leaves your machine. Signing happens locally between the app and your USB token.
Click, drag, or key in exact X/Y coordinates to drop the signature stamp exactly where it belongs.
Long-Term Validation and RFC 3161 timestamps embedded automatically, so signatures stay verifiable for years.
Switch between multiple Class 3 DSCs on the same token — the app reads every certificate off the chip.
The engine polls for HID events and detects your DSC USB token automatically.
Queue one or many PDFs to be cryptographically sealed in a single run.
Drag the stamp on the live preview or enter exact page and coordinate values.
The token performs the cryptographic signing operation and the sealed PDF is saved.
Signatures satisfy India's statutory definition of an electronic signature.
Private keys are generated and held on certified hardware security modules.
Signatures remain verifiable in Adobe Reader long after the certificate expires.
Direct C-level bindings to your token's PKCS#11 module — no middleware guesswork.
A lean native client — WPF (.NET 8) UI, BouncyCastle for PDF cryptography, and direct PKCS#11 hardware bindings.
# Hardware driver: pkcs11-native tokens: [proxkey, epass2003, mtoken-cryptoid, watchdata, trustkey] # Signature stamp_style: bouncycastle-cms-default timestamp: rfc3161 ltv: true # Placement scope: all_pages x: 105px y: 666px
Yes. Bulk Pages mode stamps a digital signature on every page of contracts, audits, or ledgers running to 100+ pages in a single pass — you can also restrict it to the first page, last page, or a custom page range.
No. All PDF rendering and cryptographic signing happen locally on your Windows PC. Your files, private keys, and DSC token never leave your machine. The app only connects online to verify your account login and subscription status.
ProxKey, ePass2003, mToken, mToken CryptoID, Watchdata, and TrustKey — all over native PKCS#11 bindings. If your token isn't on this list, get in touch and we'll look at adding support.
Yes — a 1-day full-access trial activates automatically as soon as you create an account inside the app. No separate web signup is required.
That's normal for new independent-developer apps that haven't yet built up SmartScreen reputation — it doesn't mean the file is unsafe. Click "More info", then "Run anyway" to continue installing.
Yes. Signing with a CCA India-approved Class 3 DSC token satisfies the statutory definition of a digital signature under Section 5 of the IT Act, 2000, and signatures embed RFC 3161 timestamps with Adobe LTV support so they remain verifiable long after the certificate expires.
Download the desktop client, plug in your DSC token, and get your first PDF sealed in under a minute.
verified_user Seeing a Windows SmartScreen warning?
That's normal for new independent-developer apps that haven't yet built up SmartScreen reputation — it does not mean the file is unsafe. Click "More info", then "Run anyway" to continue installing.