Sign & Approve Invoices — PDF Signature in Seconds

In many businesses, invoices require a manager's signature before they can be processed for payment. Traditionally, this meant printing the invoice, signing it with a pen, scanning it, and filing the paper copy. That workflow is slow, wasteful, and creates bottlenecks when the approver is traveling or working remotely. With SigPDF, invoice approval takes seconds — open the invoice PDF, add your signature, and download the approved document.

Common Invoice Signing Scenarios

• Approval signatures — Managers and department heads sign invoices to authorize payment.
• Freelancer and contractor invoices — Some clients require that freelancers sign their own invoices to certify the accuracy of billed hours or deliverables.
• Receipt confirmation — A signed invoice can serve as confirmation that goods were delivered and accepted.
• Vendor onboarding — New vendor agreements sometimes require signed proforma invoices before a purchase order is issued.
• Audit and compliance — Having signed invoices on file provides clear documentation for internal and external audits.

Keep Financial Documents Private

Invoices contain sensitive financial information — line-item pricing, payment terms, bank account details for wire transfers, tax identification numbers, and client billing addresses. Uploading these documents to a cloud-based signing platform means trusting a third party with your financial data. SigPDF processes everything in your browser. Your invoice PDF never leaves your device.

How to Sign an Invoice with SigPDF

1. The invoice arrives by email as a PDF attachment
2. Open SigPDF and load the invoice PDF — drag and drop or click to browse
3. Draw or place your approval signature on the document
4. Add an approval date or any additional text fields as needed
5. Download the signed PDF and forward it to accounts payable