Token stays secure
Class 3 credentials remain on the USB device. No PFX upload required for USB signing.
Incite Gravity · Class 3 digital signatures
Sign PDFs with Class 3 DSC — API, portal, or USB token.
IG E-Sign is the developer-first platform for PFX and USB DSC signing, GSTIN verification, and E-way bill and e-invoice print — with audit trails, tenant isolation, and a Windows agent that keeps private keys on the token.
100 signatures / month free
Signed
via USB token · PKCS#11
API + local signing
Cloud prepares the job. Windows agent signs with PKCS#11. Your backend polls and downloads.
Desktop agent
Pair once from the portal. Agent runs in the tray and prompts for the token PIN when needed.
Platform
Everything you need to sign at scale
PFX API, Class 3 USB tokens, GST services, and a production portal — one account, one audit log.
Class 3 USB DSC signing
Private key stays on the token. Your ERP or portal prepares the job in the cloud; the IG E-Sign Agent signs via PKCS#11 on Windows. PIN entry never leaves the signing PC.
GSTIN, E-way & e-invoice
Verify GSTIN, print E-way bills, and download e-invoice PDFs by IRN — separate monthly quota from signing.
PFX API
REST signing with inline PFX or saved certificate aliases. Automatic anchor detection and placement.
Desktop agent
Pair once, run in the system tray, sign from localhost for browser and ERP workflows.
Audit trail
SHA-256 hashes, document type, client IP, and endpoint logged on every signature and GST call.
Portal signing
Upload, preview placement with PDF.js, sign in-browser, and download — no integration required.
GST services
GSTIN, E-way bill, and e-invoice from one place
Look up GSTIN details and download compliance PDFs without leaving IG E-Sign — dashboard or API.
- GSTIN details Registration status, legal name, filing preferences, and return status.
- E-way bill print Detailed, regular, or consolidate PDFs by 12-digit e-way bill number.
- E-invoice print (IRN) Download e-invoice PDF using the 64-character Invoice Reference Number.
Three ways to sign
Integrate in minutes, sign on token, or use the portal
Choose the path that fits your team. All flows share quotas, certificates, and audit logging.
PFX API workflow
- Register and get approved
- Upload a PFX and create an API key
- Send PDF + certificate from your app
- Receive signed PDF with signing ID and hashes
USB DSC workflow
- Install and pair the IG E-Sign Agent on Windows
- Prepare the sign job from your application
- Trigger the local agent — user enters token PIN
- Poll until complete, then download
Browser workflow
- Sign in to your IG E-Sign dashboard
- Upload a PFX or use Sign with USB
- Preview signature placement
- Sign and download — logged in activity
Trust & compliance
Built for business-critical documents
Legally valid digital signatures with PFX or Class 3 USB DSC, plus GSTIN verification and E-way / e-invoice print for Indian compliance workflows. Multi-tenant isolation, rate limits, and full traceability in your dashboard.
ISO 27001:2022 · Incite Gravity
- Private key never exported from USB DSC tokens
- Company profile and NIC credentials for GST services
- Per-organization API keys and encrypted certificates
- Document type auto-detection from PDF content
- SHA-256 audit on every signature and GST call
Ready to sign your first PDF?
Create a free account and start signing via API, desktop agent, or browser — with GST services when you need them.