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Compress XLSX

Reduce XLSX file size by recompressing embedded images — free, no signup.

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Drag & Drop your XLSX here

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Maximum file size: 50 MB

Your file is processed securely and deleted automatically after conversion. Your data is protected under GDPR.

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Conversion completed

Your XLSX has been compressed successfully.

Download Compressed XLSX
1 Select XLSX
2 Compress XLSX
3 Download Compressed XLSX

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How to 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.

Quick fact about 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.

Why compress XLSX?

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.

Technical details

Input format XLSX (Excel 2007+)
Output format XLSX
Typical reduction 30-70%
Formulas Preserved
Values/data Preserved losslessly
Revision history Stripped
Engine Custom XLSX optimizer
Max file size 50 MB per file
File retention Auto-deleted after compression

How the conversion works

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.

When to compress XLSX

Quality considerations

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.

Limitations and caveats

Compatibility

Tips for best results

Compression levels explained

Level Size reduction Best for
Low ~15-25% Minimal changes
Medium (default) ~30-50% Most use cases
High ~50-70% Strict size limits
Maximum ~65-80% Severe limits

Common problems and fixes

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.

Frequently asked questions

Is XLSX compression free? +
Yes — completely free, no signup, no watermark.
Will formulas be preserved? +
Yes — all formulas, values, and formatting are preserved 100% losslessly.
How much smaller will my XLSX be? +
Typically 30-50% smaller at Medium. Heavily edited files can shrink 60-80%.
Will data be lost? +
No — all data is preserved. Only internal bloat (unused styles, revision history) is stripped.
Can I compress password-protected XLSX? +
No — remove the password first.
Is my file safe? +
Yes — files are auto-deleted after compression.
Does it work with XLS files? +
Only XLSX is supported. Convert XLS to XLSX first.

Sources and references

Last reviewed: 2026-10-01