Desktop signing, server-side signing with a PFX or an HSM on Windows and Linux, on-premises Aadhaar eSign and ERP Connect. Pick the one that matches who signs and where your certificate is kept.
Choose by who signs and where the signing key is kept
| Product | Who Signs | Where the Key Is | Runs On | Best For |
|---|---|---|---|---|
| Desktop & client-side | ||||
| SuTan Sign Desktop | A person, at their PC | DSC USB token or PFX file | Windows 10 / 11 | Teams signing their own documents, one at a time or in folders |
| ERP Connect | A person, from the ERP screen | Their own DSC USB token | Windows PC + your web ERP | Approvals that must carry a named person's signature |
| Server-side · PFX | ||||
| Server-Side PFX for Windows | Your ERP, automatically | Class 2 Document Signer Certificate (PFX) on your server | Windows 64-bit | Invoices, statements and letters in volume |
| Server-Side PFX for Linux | Your ERP, automatically | Class 2 Document Signer Certificate (PFX) on your server | Ubuntu 20.04+ / Debian, 64-bit | The same, on Linux servers |
| Server-side · HSM | ||||
| Server-Side HSM for Windows | Your ERP, automatically | Inside your Utimaco or PKCS#11 HSM | Windows 64-bit | Companies whose policy requires keys in an HSM |
| Server-Side HSM for Linux | Your ERP, automatically | Inside your Utimaco or PKCS#11 HSM | Linux 64-bit | The same, on Linux servers |
| Aadhaar eSign | ||||
| On-Premises Aadhaar eSign | Customers, vendors or staff | Issued per signature by a CCA-licensed eSign provider after Aadhaar OTP | Your server | Agreements and forms signed by people without a DSC |
A Windows app from the Microsoft Store for signing PDFs on your own computer: one document at a time, by template, or whole folders at once.
Client-side signing for documents that must carry a named person's signature. Your ERP creates the PDF, the signer clicks Sign in the ERP, and SuTan Sign Desktop opens on their PC to sign it with their USB token.
ERP Connect is new. Talk to us about a pilot with your ERP.
A signing engine that runs as a local service on your Windows server. Your ERP sends each PDF and gets the signed PDF back, signed with your company's Document Signer Certificate.
Earlier called the OP Signing Utility.
The same signing engine as a native Linux binary. Run it as a systemd service next to your ERP and connect it exactly as you would the Windows engine.
For companies that keep signing keys in a Hardware Security Module. The SuTan engine builds each signature and sends only the document's hash to your HSM, which performs the signing step.
We confirm your HSM model in an acceptance test before go-live. Setting up the HSM itself stays with your team or HSM vendor.
HSM signing for Linux servers. The engine and the HSM helper install as systemd services, and only the document's hash goes to your HSM.
We confirm your HSM model in an acceptance test before go-live.
Let customers, vendors and employees sign with an Aadhaar OTP, with no DSC token needed. The eSign app runs on your server, next to your ERP, and works through a CCA-licensed eSign Service Provider.
Documents listed in the First Schedule of the IT Act, such as wills and powers of attorney, can't be signed electronically.
Tell us who signs and where your certificate is kept. We'll recommend a product and set up a test.