Steps
- Upload your workbook - Drop one or several .xlsx/.xls files - compression runs locally in your browser.
- Pick optimizations - Trim empty rows and columns outside the data, remove comments, and optionally convert formulas to values.
- Compare the result - The tool shows original vs compressed size and how much was saved.
- Download the smaller file - Save the optimized workbook (or a ZIP when compressing several files at once).
Before You Start
- Trimming empty edges fixes the classic 'used range' bloat where Excel tracks thousands of empty rows.
- Converting formulas to values shrinks files but makes the data static - keep a working copy.
- Embedded images are a common cause of huge files; compress pictures in Excel separately.
Alternative Methods
- Save as .xlsb - Excel's binary format is often noticeably smaller than .xlsx for large workbooks, at the cost of compatibility with other tools.
- Clean up inside Excel - Delete unused sheets, clear formatting beyond your data (Home > Clear > Clear Formats), and use Picture Format > Compress Pictures for images.