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Document E-Signer
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Class 3 DSC Compatible

Hardware-Backed
PDF Signatures.

Cryptographically seal your PDF documents locally using USB Tokens (ProxKey, ePass2003, mToken). Fully compliant with the Indian IT Act 2000 and Adobe LTV standards.

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verified CCA India Compliant
wifi_off 100% Offline & Private PKCS#11 Architecture
Capabilities

Everything you need to sign at scale.

A native desktop engine built around your hardware token — no browser plugins, no cloud upload, no compromise on the cryptography.

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Hardware-backed signing

Talks directly to ProxKey, ePass2003, and mToken devices over PKCS#11 — your private key never leaves the token.

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Bulk, multi-page stamping

Seal a 1-page letter or a 145-page tender in one pass, with per-page or custom-range placement rules.

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100% offline & private

No document ever leaves your machine. Signing happens locally between the app and your USB token.

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Pixel-precise placement

Click, drag, or key in exact X/Y coordinates to drop the signature stamp exactly where it belongs.

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LTV & timestamping

Long-Term Validation and RFC 3161 timestamps embedded automatically, so signatures stay verifiable for years.

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Multi-certificate support

Switch between multiple Class 3 DSCs on the same token — the app reads every certificate off the chip.

Workflow

From token to signed PDF in four steps.

01

Insert your token

The engine polls for HID events and detects your DSC USB token automatically.

02

Select your documents

Queue one or many PDFs to be cryptographically sealed in a single run.

03

Place the signature

Drag the stamp on the live preview or enter exact page and coordinate values.

04

Apply & finish

The token performs the cryptographic signing operation and the sealed PDF is saved.

Compliance

Built to hold up to legal & audit scrutiny.

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Section 5, IT Act 2000

Signatures satisfy India's statutory definition of an electronic signature.

security

FIPS 140-2 Level 3

Private keys are generated and held on certified hardware security modules.

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Adobe LTV enabled

Signatures remain verifiable in Adobe Reader long after the certificate expires.

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PKCS#11 native hooks

Direct C-level bindings to your token's PKCS#11 module — no middleware guesswork.

Tech Specs

Under the hood.

A lean native client — PyQt6 UI, pyHanko for PDF cryptography, and direct PKCS#11 hardware bindings.

Windows 10/11 PDF 1.7 / PAdES RFC 3161 TSA Class 3 DSC
signer_config.yaml 
# Hardware
driver: pkcs11-native
tokens: [proxkey, epass2003, mtoken-cryptoid]

# Signature
stamp_style: pyhanko-default
timestamp: rfc3161
ltv: true

# Placement
scope: all_pages
x: 105px  y: 666px

Ready to sign your documents?

Download the desktop client, plug in your DSC token, and get your first PDF sealed in under a minute.

desktop_windows Download for Windows • Windows 10/11