Compress XLSX
Reduce Excel workbook file size by optimizing embedded images and repacking the archive.
or drop files here
Maximum file size: 100MB per file
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About XLSX Compression
XLSX workbooks are packaged archives that grow large mainly from embedded images, charts and stock media. This browser-based compressor reprocesses those heavy assets and repacks the archive at higher efficiency, producing smaller Excel files for email, upload limits and storage savings — while your workbook stays on your own device the whole time.Before emailing a PDF, open the downloaded copy and check fine text at the intended viewing size. The tool can reduce image detail; its target size is not guaranteed. If forms, signatures or searchable text matter, keep the original PDF.
How to Compress an XLSX File Online
Upload your XLSX files
Choose one or more Excel `.xlsx` workbooks from your device.
Select a compression level
Choose the image-quality profile that gives you the right balance between smaller size and workbook appearance.
Compress and download
Process the files in your browser and download the reduced XLSX workbooks when the task is complete.
Frequently Asked Questions
How does XLSX compression work?
XLSX files are ZIP archives containing images, charts and XML. Our tool extracts the archive, re-encodes embedded images at optimized quality levels, and repackages the workbook with efficient compression.
Will my formulas and data change?
Cell data, formulas, formatting and pivot tables remain intact. Only embedded images are re-encoded. The workbook will calculate and look the same when opened in Excel.
How much can I reduce XLSX file size?
Workbooks with many embedded images can shrink by 50–80%. Data-only workbooks see smaller reductions, mainly from more efficient archive repacking.
Is this XLSX compressor free?
Yes, completely free with no limits. Process as many Excel files as you need, no registration required.
References & Resources
Authoritative specifications and references for the file formats this tool works with.