Dear Hello, I am very glad to answer your questions. Adding the invoice stamp to the electronic invoice is 1. After opening the VAT invoice invoicing software (tax UKey version), click the invoice management on the left, and then click the invoice query 2. After entering, click the invoice type in the upper left corner, select the VAT electronic invoice, and then click the query button. 3. After the invoice record is found out, click the View Original Ticket button at the back. 6. After the download is completed, install the OFD reader. The specific installation process is very simple, so I won't elaborate on it. Just go to the next step. 7. After the installation is completed, run the software. First click the open button in the upper left corner, find the file you just downloaded, select it and open it. 8. After the file is opened, there is no invoice stamp in the lower right corner. 10. When you come in, you can see whether it is stamped (invoice stamp). By default, it is stamped on all pages. Let's directly click on the bottom right to turn it into a PDF. 1 1, and then open the newly converted pdf file, and you can find that the invoice special seal has been stamped.