Techniques for obtaining electronic signatures via word processing applications are described. One approach utilizes a code module, also referred to as a “markup module,” that executes within a word processing application and that facilitates the preparation of a document for electronic signature. A user can operate the word processing application together with the markup module in order to add signature tag markers to the document and to provide recipient information about intended signers, such as names and email addresses. Once the document has been prepared, the code module transmits the document (including the added signature tag markers) and the recipient information to a digital transaction service. The digital transaction service then manages the signing of the document, such as by notifying the recipient, receiving the recipient's signature and securely storing the signature in association with the document.