Class 3 USB DSC
PKCS#11 signing via the IG E-Sign Windows agent — private key never leaves the token.
Incite Gravity · IG E-Sign
Everything you need to sign PDFs at scale
PFX API, Class 3 USB DSC, GSTIN verification, E-way bill and e-invoice print, portal signing, and audit trails — one platform for Indian businesses and developers.
Signing
PFX API
REST API with inline PFX or saved certificate aliases and automatic anchor placement.
Portal signing
Upload, preview placement with PDF.js, sign in-browser, and download.
Free trial sign
Try signing without an account — watermarked output for evaluation.
Compliance & audit
SHA-256 audit trail
Hash before/after, document type, client IP, and endpoint on every signature.
ISO 27001:2022
Built by Incite Gravity, an ISO 27001:2022 certified security partner.
Tenant isolation
Per-organization API keys, certificates, and usage quotas.
Rate limiting
Built-in throttling on signing and GST API endpoints.
GST & integrations
GSTIN lookup
Registration details, filing preferences, and return status from one dashboard.
E-way bill print
Download detailed, regular, or consolidate E-way bill PDFs by e-way bill number.
E-invoice print (IRN)
Download e-invoice PDFs using the 64-character Invoice Reference Number.
REST API
Programmatic GSTIN, E-way, and e-invoice calls with a separate monthly GST quota.
Developer docs
Interactive API reference with code samples in multiple languages.
ERP ready
Designed for Business Central and custom backends calling localhost USB agents.
Ready to integrate?
Start on the Free plan or talk to us about Pro and Enterprise entitlements.