Google Ads Editor is the free desktop app that lets you build a whole campaign offline and post it in one operation. Prepare a CSV or Excel file with one row per entity: campaigns need Campaign, Campaign Daily Budget, Campaign Type, Networks and Bid Strategy Type; keywords need Campaign, Ad Group, Keyword and Criterion Type; responsive search ads need Headline 1 through 15 with their position columns for pinning, plus Description 1 through 4 and Final URL. Import from file, fix errors, review status, budget, final URLs and location targeting, then post and verify in the web interface.