Can Windows 11 compress a PDF without extra software?

Not really. Microsoft Print to PDF rewrites the file but keeps images at their original resolution, so the saving is small or zero. Windows has no equivalent of the Mac's Reduce File Size filter. A browser tool is the no-install option that does resample images.

Does Microsoft Word compress PDFs?

Word can open a PDF, convert it to an editable document and save it back as a PDF with the Minimum size option, which does reduce image quality. The layout passes through Word's converter on the way, so complex pages can shift. It also requires Word to be installed.

Is the browser tool safe to use on a work PC?

The compression runs inside the browser tab. The PDF is not uploaded, so it never leaves the machine or passes through a third-party server, which is usually the concern a company policy is written around. You can confirm this in the browser's network tab while the tool runs.

Why is the compressed PDF larger than the original?

Flattening a text document to images makes it bigger, because sharp type compresses far better as text than as a picture of text. Use Rebuild for documents and Flatten to images only for scans. The tool measures the result and hands the original back when the output grew.

How to compress a PDF on Windows

Windows 10 and 11 open PDFs in Edge but ship nothing that compresses them; Microsoft Print to PDF re-saves a file and rarely makes it smaller. The reliable route is a browser tool, which runs in the Edge or Chrome you already have.

Is there a built-in way on Windows?

No. Windows has nothing built in for this, and the closest things get in the way:

Open the PDF in Edge, press Ctrl+P, choose Microsoft Print to PDF and save a copy. This rebuilds the file but does not resample images, so the size usually stays put.
If you have Microsoft Word installed, File → Open the PDF, then File → Save As → PDF and pick Minimum size (publishing online). That does compress images, at the cost of converting the layout through Word first.

What that means

No built-in compressor in Windows itself; Word's option needs a Microsoft 365 licence and reflows the document.
Print to PDF discards links, bookmarks and form fields.

Do it in the browser instead

The same Compress PDF tool as the main page, running in Edge or Chrome on Windows. Nothing is installed and the file is processed on your device.

Drop your PDF here

PDF · up to 100 MB · runs entirely in your browser

Processed in your browser. This file never leaves your device.

01
Choose the PDF
Open the tool in Edge or Chrome, choose the file, or drag it from File Explorer onto the page.
02
Pick a mode
Rebuild for documents whose text should stay selectable; Flatten to images for scans.
03
Download the result
Click Compress PDF and then Download. The file lands in your Downloads folder like any other download.

Microsoft Print to PDF or the browser tool?

	Built in on Windows	PDF Spree
Cost	Free (Word needs a licence)	Free, no account
Text stays selectable	Print to PDF: yes. Word: usually	Yes
File leaves your device	No	No — processed in the browser
Works on other devices	No, this platform only	Yes, any modern browser

How to compress a PDF on Windows

Is there a built-in way on Windows?

What that means

Do it in the browser instead

Choose the PDF

Pick a mode

Download the result

Microsoft Print to PDF or the browser tool?

Compress PDF on Windows: questions

The same task on other devices

More PDF tasks on Windows

Is there a built-in way on Windows?

What that means

Do it in the browser instead

Choose the PDF

Pick a mode

Download the result

Microsoft Print to PDF or the browser tool?

Compress PDF on Windows: questions

Can Windows 11 compress a PDF without extra software?

Does Microsoft Word compress PDFs?

Is the browser tool safe to use on a work PC?

Why is the compressed PDF larger than the original?

The same task on other devices

More PDF tasks on Windows

Related tools