Compress Excel Files

Need to compress an Excel file online? This free tool reduces XLSX file size in your browser - trim empty ranges, drop comments, and recompress the workbook so it is small enough to email or upload, without sending your data anywhere.

How to Compress Excel Files

1. Open your file - Drag and drop or click to browse; several files compress as a batch.
2. Pick a size target or options - Under 10 MB for email, or exactly the steps you want.
3. Review results - The before and after bars show the saving, and the panel says what would save more, one click away.
4. Download - Save the compressed copy, or open it straight in the next tool.

Excel File Too Big to Email?

Outlook and Outlook.com refuse attachments over 20 MB by default, Gmail stops at 25 MB (anything larger becomes a Google Drive link), and many company mail servers set 10 MB or less. Attachments also grow by about a third when they are encoded for sending, so a 17 MB workbook can still bounce at a 20 MB limit - aim for well under it.

To send an Excel file that is too large, work down this list:

1. Compress it here with "Recompress embedded images" on - pictures are usually what makes a workbook huge, and this keeps every sheet and formula.
2. Send a values-only copy - "Convert formulas to values" drops formula text and the calculation chain. Keep your original for further work.
3. Split it - Excel Splitter saves each sheet as its own file, so each attachment stays small.
4. Share a link instead - put the file in OneDrive, SharePoint, Google Drive or Dropbox and email the link. Zipping does not help: an .xlsx is already a ZIP archive.

Need an Excel file under 5 MB for an upload form? The same order applies; images first, then a values-only copy, then splitting by sheet. The before and after bars above show exactly how much each run saved.

Compression Options Explained

• Trim empty rows and columns - Removes unused space at the edges of your data, reducing file size.
• Convert formulas to values - Replaces formulas with their calculated results. This can significantly reduce file size but you'll lose the ability to recalculate.
• Remove comments - Deletes all cell comments and notes from the workbook.

See What's Making Your File So Large

Compression works best when you know where the bytes are going. After each run, this tool shows a breakdown of your workbook by category - worksheet data, embedded images, pivot table caches, styles, and other parts - with the share of the file each one takes. Some compression services sell this kind of file analysis as a separate tool; here it is built into every compression, free.

If images dominate the breakdown, switch on Recompress embedded images and run the file again: pictures are scaled down and re-encoded in your browser while sheets, formulas, and charts stay untouched. On image-heavy workbooks this is routinely the largest single saving.

How This Compares to Other Excel Compressors

Most Excel compressors send the workbook to a remote service and apply one preset. That is convenient, but it hides both the upload step and the reason the workbook is large.

Excel-compressor descriptions checked 2026-07-28 against the linked live pages; see each provider for current limits and terms.

Spreadsheet bloat is not one problem. Empty used ranges and duplicate styles are workbook-structure overhead, while embedded pictures are media and formula-to-value conversion changes future recalculation. This page exposes those categories separately, reports their sizes, and makes destructive options explicit instead of treating every byte as interchangeable.

Tips for Smaller Excel Files

• Delete unused sheets and hidden data
• Remove unnecessary formatting and conditional rules
• Compress or resize embedded images
• Use XLSX format instead of XLS (XLSX uses ZIP compression)
• Save using the .xlsb binary format for very large files