Word/Google Docs -> PDF conversion is perfectly fine, and every system will understand it. Just don't try to get fancy with layouts and stick to headings, subheadings and bullets. People reading the resume will appreciate this as well.
This is how I formatted my resume using Pandoc to generate a word document from a Markdown file. Having everything in Markdown also made it easy to quickly create customized resumes by reordering specific sections or lists in a section as well as tracking changes in Git.