Excel University Blog

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Zip Code Lookup API

By Jeff Lenning | November 4, 2025 |

Imagine being able to type a zip code into a cell in Excel and have the corresponding city and state automatically fill in. No manual entry, no lookup tables … just a smart, seamless automation. In this walkthrough, we’ll explore how to tap into a free zip code API using Excel’s WEBSERVICE function, and then…

Generate Sudoku in Excel with Free API

By Jeff Lenning | September 30, 2025 |

Did you know we can auto-generate Sudoku puzzles right inside Excel, without manually entering grid layouts? With the WEBSERVICE function and a little help from a Sudoku API, we can create both a playable Sudoku puzzle and its corresponding solution dynamically. In this step-by-step guide, we’ll show how to make a Sudoku board using Excel’s…