Whether the electronic bidding documents need to be stamped depends on the specific requirements of the bidding documents. Generally speaking, the legal representative's power of attorney, business license (qualification, safety license, certificate), tender, letter of commitment, bill of quantities and other copies. The bid evaluation needs to be stamped and signed page by page. At the same time, some documents, especially the credit inquiry and the bid-winning publicity of performance data, need to be stamped with the company's seal. If these documents are not stamped, the bid may be rejected.

For how to add electronic signature, a common way is to use Word software to edit the tender, stamp the electronic signature stamp according to the sealed items required by the tender, and then upload the sealed tender to the electronic tender making system. In addition, you can also print all the contents of the bidding documents that need to be sealed into paper documents, affix a red seal on the paper documents, scan them into PDF files with a scanner, and then upload the sealed PDF files to the electronic bidding document production system. Both methods can effectively increase the safety factor of bidding documents.