Compress XLSX

1. Upload your XLSX (up to 50 MB).
2. Choose a compression level.
3. Click 'Compress XLSX' — takes 3-10 seconds.
4. Download the smaller XLSX.

XLSX files bloat with unused styles, revision history, cached calculation results, and high-resolution charts. Compressing optimizes these — typically 30-70% smaller with all formulas and data intact.

Excel files often balloon because of accumulated styles, revision history, cached formula results, and embedded charts — a 10 MB spreadsheet may contain 8 MB of internal bloat that Excel creates over time. Our compressor strips this bloat and re-encodes internal structures efficiently, typically achieving 30-70% size reduction without losing any data.

The compressor unpacks the XLSX archive, strips unused styles and revision history, removes cached calculation results (Excel recalculates on open), re-encodes internal XML efficiently, and re-packs the XLSX. All formulas, values, and formatting are preserved.

• Emailing large Excel spreadsheets.
• Uploading XLSX to systems with size limits.
• Reducing cloud storage costs for XLSX archives.
• Preparing spreadsheets for web download.
• Meeting upload caps on job portals and forms.
• Shrinking revision-history-heavy files.
• Optimizing XLSX files for mobile sharing.

All formulas, values, and formatting are preserved 100% losslessly. Only unused internal structures are stripped. There is no visible change to the spreadsheet's content.

• Only XLSX supported (not legacy XLS).
• Very small XLSX files (under 50 KB) may not benefit.
• Revision history is stripped.
• Pivot tables are preserved but caches may be cleared.
• Encrypted XLSX must be unlocked first.

• Output XLSX opens in Microsoft Excel 2007+.
• Opens in Google Sheets, LibreOffice Calc, Numbers.
• All formulas and data preserved.
• Standard XLSX — no special software needed.
• Accepted by every spreadsheet platform.

• Medium is the sweet spot — 30-50% smaller with no visible change.
• For heavily edited spreadsheets, revision history is the biggest source of bloat.
• All formulas and values are preserved losslessly.
• Keep the original XLSX if you may need revision history.
• For legacy XLS files, convert to XLSX first.

XLSX is barely smaller

The XLSX may already be optimized. Try Maximum level. Spreadsheets with mostly text have little to compress.

Revision history is missing

Revision history is stripped during compression. Keep the original XLSX if you need it.

Pivot tables recalculate on open

Pivot caches are cleared for size reduction. Excel recalculates on open — no data loss.

• Microsoft — Office Open XML