How to Compress PDF on Windows: 3 Methods

A 40-slide deck can be 30 MB even when the text is light. Embedded images carry the weight. Outlook blocks attachments and vendor portals time out long before anyone reads the content.

Three solid routes cover most Windows jobs: GetCompress for batches and presets, PowerPoint re-export when you still have the deck, and Ghostscript when you need a controlled pass on scans.

Method 1: GetCompress

Best for: Folders of decks, scans, and reports that share the same optimization every week. Local processing matters for contracts and unreleased materials.

1. Open GetCompress and drop one PDF or a folder into the queue.
2. Pick a PDF compression preset. GetCompress optimizes embedded images inside the file.
3. Preview a chart-heavy or signature page when small type matters.
4. Export a new copy; keep the master.

Save the preset so the next compress pass is one click. PDF compression does not use an exact megabyte target file size. That control is video-only. Use quality and image optimization, then check File Explorer size against your email or portal limit.

Method 2: Re-export from PowerPoint

Best for: Decks you still have as PPTX.

1. Open the file in PowerPoint.
2. File → Export → Create PDF/XPS Document.
3. Pick Minimum size (publishing online) for screen viewing, or Standard when charts need sharper lines.

Zoom charts and small type. If it looks muddy, re-export at higher quality instead of over-compressing. Keep a print-quality PDF in archive storage, not in the email copy.

When reviewers need individual pages, see PDF to images on Windows . For scan merges, see JPG to PDF on Windows .

Limitation: Needs the editable source. Vendor PDFs without a deck skip this method.

Method 3: Ghostscript for scans

Best for: Image-heavy scan PDFs when you need a CLI profile and can compare pages carefully.

Prefer re-scanning at 150 to 200 DPI when you control the source. Microsoft Print to PDF is a last resort; quality loss is hard to predict.

Install Ghostscript with winget, then:

winget install ArtifexSoftware.GhostScript
gswin64c -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook `
 -dNOPAUSE -dQUIET -dBATCH -sOutputFile=compressed.pdf input.pdf

Compare one page with signatures or fine print in Edge before you batch the rest. When scans arrive as JPEG files, resize in Photos before Print to PDF so the merge starts smaller.

Limitation: You maintain the commands. Easy to over-soften text if you jump straight to aggressive profiles.

Which method should you use

Name the compressed copy clearly in File Explorer so you do not attach the master by mistake.

Why PDFs get large

Most bloat is raster images saved at print resolution inside a file meant for screens. Text and vectors stay small; photos, slide bitmaps, and scans dominate.

If you merge many JPEG scans, compress after merge. Each photo can look fine alone and still blow the attachment limit together.

When PowerPoint re-export is enough

PowerPoint re-export can finish a single deck when Minimum size clears the limit and text stays sharp.

GetCompress also covers quarterly report folders, scan batches, the same preset, or sensitive files you will not upload to a browser tool. It does not replace PowerPoint. For broader cleanup, see reduce file size on Windows .