LocalFileNest
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Compress Office Documents

Reduce the file size of Word (.docx), PowerPoint (.pptx), Excel (.xlsx) and LibreOffice (.odt) by recompressing embedded graphics.

Local processing · Your files stay on your device DOCX · PPTX · XLSX · ODT

Drop your document here

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Accepted formats: Word (.docx), PPT (.pptx), Excel (.xlsx), LibreOffice (.odt) · 100% Local

Compression Options

75%
Structure Preservation

Styles, typography, tables, formatting, and macros remain 100% intact. Only large raster images are compressed.

How does Office document compression work?

  1. In-memory package unpacking: .docx, .pptx, and .xlsx files are ZIP bundles unpacked locally via JSZip.
  2. Canvas image re-encoding: Embedded high-resolution graphics are detected and optimized directly in your browser.
  3. Repackaged download: The updated document container is rebuilt cleanly with no server contact.

Frequently Asked Questions

Will text formatting or tables change?

No. Document XML structure, typography, formulas, and layouts remain untouched. Only large embedded image assets (JPEG/PNG) are re-encoded.

Are my confidential documents private?

Yes. No files, text, or graphics are uploaded to an external server. The whole optimization process runs completely inside your browser.