How to Make a PDF Smaller on Windows 10 and 11

Windows does not ship a PDF compressor. Not in Windows 10, not in Windows 11. There is a PDF printer, a ZIP command in the right-click menu, and a PDF viewer inside Edge — and none of the three is built to make a PDF smaller. That is why the same question keeps getting asked on Microsoft's own support forums with no built-in answer.

So the useful version of "how do I make a PDF smaller on Windows" is: which of the tools you already have will actually help, and which will waste your time. Here is the honest ranking.

Best case: if the PDF came from Word, Excel or PowerPoint, re-export it

This is the one native path that works properly, and it is the one most people skip because they are looking at the finished PDF instead of the file it came from.

Open the original document, go to File → Export → Create PDF/XPS Document, and in the save dialog look at the Optimize for radio buttons at the bottom. Microsoft's own documentation states the trade-off plainly: "If the document requires high print quality, select Standard (publishing online and printing)" and "If file size is more important than print quality, select Minimum size (publishing online)."

Minimum size re-encodes the images inside the document for screen viewing. The text stays as text, so the document remains selectable and searchable — which matters more than people expect if the PDF is a CV heading for an applicant tracking system, or a form that someone will need to copy a reference number out of.

The catch is obvious: you need the source file. If all you have is the PDF, skip to the browser section.

If it is a scan, the fix is in the scanner, not on the PC

Scanned PDFs are the single most common cause of an oversized file, because every page is a photograph. A colour scan at 600 DPI produces pages that are ten to twenty times heavier than they need to be for a document that is only going to be read.

Before you compress anything, rescan at 300 DPI, and choose greyscale or black-and-white if the page is text. That one change usually does more than any compressor will, and it does it without softening the letters.

What "Compress to ZIP folder" actually achieves: almost nothing

Right-clicking a PDF and choosing Compress to ZIP folder feels like the obvious move. It is not.

A PDF already compresses its own contents — text streams are deflated and images are stored as JPEG or similar. ZIP then tries to compress data that has already had the redundancy squeezed out of it, and finds very little left. Expect a couple of percent, not a couple of megabytes. We ran into the same physics building our own tools: our multi-file export writes a store-only ZIP on purpose, because running DEFLATE over already-compressed JPEG and PDF payloads costs CPU and returns nothing.

ZIP is a way to group several files into one attachment. It is not a size fix.

Microsoft Print to PDF: a re-print, not a compressor

Opening a PDF in Edge and printing it to "Microsoft Print to PDF" is widely recommended and genuinely unpredictable. You are not compressing the file — you are rendering it and producing a new one. Sometimes that new file is smaller. Sometimes, especially with scans, it comes out larger than the original.

If you try it, check one thing afterwards: open the result and try to select a line of text with your mouse. If you cannot, the text layer is gone and the page has become an image. For a printed form that may be fine. For a CV, a contract or anything that will be read by software, it is a real loss.

The direct route: compress it in the browser

If you only have the PDF and you need it under a specific number, do it in a browser tab. Our compressor runs entirely on your machine — the file is never uploaded, which also means there is no upload to wait for and no copy of your document on someone's server.

• Compress a PDF to 500 KB
• Compress a PDF to 1 MB
• Compress a PDF to 2 MB

Two things it does that matter here. It tries a structural re-save first — rebuilding the file without rasterising anything, which keeps the text layer intact — and only falls back to re-encoding the page images if that misses your target. And it tells you which one it did, so you are never guessing whether your document is still text.

If the PDF is mostly a set of photographs you assembled yourself, it is often better to shrink the images first and rebuild: compress each image, then combine them into a PDF. You get far more control over where the quality goes.

And if the file is only oversized because it is long, splitting it beats crushing it. Merging and splitting out the pages you need both leave the pages you keep untouched.

Windows 10 versus Windows 11: no difference that matters

The search suggestions split neatly into "windows 11" and "windows 10", but the answer is the same on both. Neither version added a PDF compressor. The Word export dialog is identical, Print to PDF behaves the same way, and the ZIP menu item was only renamed. Anything claiming a Windows 11-specific compression feature is describing a third-party app.

Pick by what you have

• You have the Word/Excel/PowerPoint original — re-export with Minimum size. Best quality per byte.
• It is a scan — rescan at 300 DPI in greyscale before anything else.
• You only have the PDF — use a compressor with a byte target, and check whether the text survived.
• It is a pile of photos — shrink the images, then build the PDF.
• You just need it to fit one email — remember that attachments are encoded on the way out and grow by roughly a third, so aim under the published limit rather than at it.