Compress an Excel (XLSX) File
Compress XLSX files online by optimizing embedded images — formulas, data and formatting untouched.
How to use Compress XLSX
When a spreadsheet is unexpectedly huge, pasted screenshots and logos are the usual culprit. The tool re-compresses those embedded images and leaves every cell, formula, chart and pivot untouched — the workbook recalculates identically, it just stops being a 40 MB email problem. If your file has no images, it's data-heavy and this tool will honestly tell you there's little to save.
- Drop your file into the box above, or click it to browse. You can also paste from the clipboard.
- Adjust the options to taste — the defaults are sensible for most cases.
- Press Compress and watch the progress bar; everything runs on your device.
- Download your result — individually, or as a ZIP when there are several files.
Like every tool on ImageCompressorKits, this runs 100% in your browser: your file is never uploaded to any server, which makes it safe to use even with private documents — and it keeps working if you go offline after the page loads.
Frequently asked questions
Will my formulas or data change?
Never — the sheets' XML is copied through unchanged. Only embedded image files inside the workbook are re-encoded.
My XLSX has no images but is still huge — why?
Millions of styled cells, long change histories or huge ranges of stray formatting make data-heavy files. That weight is the data itself; in Excel, clearing unused ranges and saving as .xlsx again helps more than image compression can.
Is this tool really free?
Yes — completely free, with no signup, no watermark, and no file limits beyond what your device's memory can handle.
Are my files private?
Yes. Processing happens locally in your browser via JavaScript; nothing is transmitted or stored. See our privacy policy for the full picture.