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Invoicing Guide

How to digitally sign an invoice

Whether you're signing a handful of invoices manually or generating hundreds automatically from your billing system, there's a DSC setup that fits.

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Two ways to sign invoices, depending on your volume

Which approach makes sense depends entirely on how many invoices you're signing and whether the process needs to be automated.

Manual signing (low volume)

For businesses issuing a handful of invoices a day, signing each one in a PDF reader with your own DSC works fine.

  • Use your existing Individual or Organization Signing DSC
  • Sign each invoice manually in Adobe Acrobat Reader
  • No extra setup or integration required

Automated bulk signing (high volume)

For businesses generating many invoices via ERP or billing software, a Document Signer certificate lets signing happen automatically.

  • Document Signer DSC, delivered as a .pfx file
  • Integrates into your ERP/billing software via API
  • Signs hundreds of invoices with no manual step

Manually signing a single invoice

If you're just signing individual invoice PDFs, the process is the same as signing any other PDF.

1

Export your invoice as a PDF

Generate the invoice PDF from your billing software or template.

2

Open it in Adobe Acrobat Reader

Use Tools > Certificates > Digitally Sign, same as any document.

3

Select your DSC and sign

Choose your certificate from the connected USB token, enter your PIN, and sign.

4

Send the signed invoice

The signed PDF can now be emailed or uploaded wherever required.

Signing hundreds of invoices a month?

A Document Signer certificate removes the manual step entirely, built for exactly this use case.

Delivered as a .pfx file, no USB token needed
Integrates with ERP and billing software via API
Support setting up bulk/batch signing tools

Frequently asked questions

For company/LLP GST-related filings, yes, a Class 3 Signing DSC is required. For invoices themselves, whether a signature is required depends on your specific compliance needs and the recipient's requirements.

A Signing DSC (on a USB token) is for a person manually signing documents one at a time. A Document Signer certificate (a .pfx file) is built for automated, unattended signing at volume, typically integrated into software.

Yes, many businesses start with manual signing and move to a Document Signer certificate once volume grows. Message us when you're ready to make that switch.

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