Is XLSX Compressor free?

Yes. Mirown XLSX Compressor is free to use, and no sign up or login is required.

Can I upload multiple XLSX files?

Yes. You can upload multiple XLSX files, compress all files together, and download the results as one ZIP file.

Are files uploaded to Mirown servers?

Supported compression workflows run in the browser. Mirown is designed to avoid server storage for these file tools.

Why did my file not reduce much?

Some files are already compressed. Images, PDFs, and Office files with optimized media may show smaller reductions in a browser-only compressor.

Document tools

XLSX Compressor

Free online file compression with no sign up or login required.

Upload XLSX

Drop XLSX files here or click upload to select multiple files

Download as ZIP

Upload XLSX files, choose a compression level, then compress all files.

Buy me a coffee

Mirown is free to use, if this tool saves your time

Free file compressor

Compress Excel workbook files with local processing.

Mirown XLSX Compressor helps reduce spreadsheet package size where browser compression can safely help. Upload one or many XLSX files, choose the compression level, and download the compressed results as a ZIP.

The page is designed for daily workbooks, exported reports, lists, simple dashboards, and files that need to fit an upload or email limit.

What this free compressor includes

Multiple XLSX upload
Office package recompression
Before and after size table
Reduction percentage
Free ZIP download

How to use XLSX Compressor

Click Upload XLSX and select one or multiple XLSX files.
Choose Less compression for high quality, Medium compression for balanced results, or Extreme compression for the smallest size. Medium compression is recommended for most files.
Click Compress all files and let your browser process the files.
Check the before size, after size, and reduction percentage for every file.
Download the compressed results as a ZIP file and review them before replacing your originals.

Why use Mirown XLSX Compressor?

Mirown keeps compression simple, free, and private for everyday work. There is no account, no sign up, no login, and no complicated settings. The page is built with real crawlable text, fast static loading, and a focused browser tool so users can understand the result before downloading.

Privacy and browser-only notes

Mirown file compressor pages are designed for local browser processing. That means supported files can be prepared on your device without upload-based storage. Keep your original files, especially for important documents, and review compressed output before sending it to someone else.

Important compression limit

XLSX files with many images, macros, or already-compressed package entries may show limited reduction. The tool avoids unsafe workbook rewrites.