Question 1

Are files uploaded to a server?

Accepted Answer

No, Word, Excel, and PowerPoint files are ZIP archives internally — the tool unpacks and repacks them entirely in your browser.

Question 2

Will the content or formatting change?

Accepted Answer

No, all text, styles, and embedded media are kept as-is; only the archive's internal compression level is maximized.

Question 3

How much smaller will the file get?

Accepted Answer

Savings depend on how the file was originally saved — documents saved with light compression shrink noticeably, already well-compressed ones shrink only slightly.

Question 4

Is there a file size limit?

Accepted Answer

Files above roughly 150 MB aren't processed, since unpacking and repacking a very large archive in one pass can make the tab unresponsive.

Question 5

Does it remove the embedded document thumbnail?

Accepted Answer

Yes, the small preview thumbnail Office embeds is dropped — Office regenerates it automatically next time the file is saved.

Document Compressor

How to use it

Frequently asked questions

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