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Private browser tool

Reduce ZIP Size

Repack a ZIP using maximum DEFLATE compression and optional metadata cleanup.

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Choose a ZIP archive

Best results usually come from text, CSV, XML, code and uncompressed documents.

Remove __MACOSX, .DS_Store and Thumbs.db Keep the original if recompression is larger

Why some ZIP files cannot become smaller

JPEG, WebP, MP4, MP3 and many PDFs already contain compressed data. Repacking them may save little or can make a slightly larger archive.

What the tool does

Reads every ZIP entry in your browser.
Optionally removes common system metadata.
Repacks with DEFLATE level 9.
Compares the result with the original.

Privacy

The ZIP remains on your device during processing.

Reduce ZIP Size FAQ

Can every ZIP become smaller?

No. Already-compressed media may not shrink.

Does it change files inside?

No. It repacks entries and can remove system metadata.