XLSX, XLTX, or XLTM? Which Excel Format Should You Actually Use?
Last Updated: 06 Nov, 2026
Excel Template Formats: XLSX vs XLTX vs XLTM Explained If you have spent any real time working in Microsoft Excel, you have probably experienced this classic workplace disaster: someone builds a meticulously formatted weekly report, shares it across the team, and within three days, an eager colleague types raw numbers into the summary row and clicks Save.
Just like that, your master template is gone—replaced with Week 3 sales data.