The "M" of XLSM stands for macro. Macros are programs embedded in Office documents used to automate different tasks. Staring from Excel 2007, XLSX spreadsheets that contain macros are saved with the XLSM extension.
+200 Formats Supported
CloudConvert is your Swiss army knife for file conversions. We support nearly all audio, video, document, ebook, archive, image, spreadsheet, and presentation formats. Plus, you can use our online tool without downloading any software.
Besides using open source software under the hood, we’ve partnered with various software vendors to provide the best possible results. Most conversion types can be adjusted to your needs such as setting the quality and many other options.
Our API allows custom integrations with your app. You pay only for what you actually use, and there are huge discounts for high-volume customers. We provide a lot of handy features such as full Amazon S3 integration. Check out the API documentation.