How much smaller will my PDF get after compression?

It depends heavily on the content — image-heavy scans often shrink by 50-90%, while text-only documents shrink only slightly since there are few images to re-encode.

Will compressing my PDF make the text blurry?

No. Compression targets embedded images; selectable text and vector graphics remain sharp at every quality level.

What is the difference between the three compression levels?

Smallest Size prioritizes the lowest possible file size, Balanced is a good default for everyday sharing, and Best Quality keeps images closer to their original resolution for print use.

Do I need to install anything on Windows to use this?

No — it works in any modern Windows browser (Edge, Chrome, Firefox) with nothing to download or install.

Will this work on both Windows 10 and Windows 11?

Yes — since it runs entirely in your browser, it works identically on Windows 10, Windows 11, or older supported versions.

Compress

Compress PDF on Windows

Windows doesn't include a built-in way to do this beyond what a basic PDF reader offers, so most people either hunt for a downloadable utility or turn to a browser-based tool instead. My PDF works in any browser on Windows — Edge, Chrome or Firefox — without installing anything or restarting your computer.

Use the Compress PDF Tool

No registration required
Files deleted automatically
Works in any browser

Why This Matters

What Is a PDF Compression Tool?

A PDF compression tool reduces the file size of a PDF, usually by re-encoding the images embedded inside it and streamlining the document's internal structure, while keeping the number of pages, the text, and the overall layout exactly the same. The result is a file that looks the same to the reader but takes up noticeably less disk space and transfers faster.

Step by Step

How to Compress PDF on Windows

Upload Your PDF

Drag in the PDF you want to shrink, or click to browse and select it. On Windows, just drag the file straight from File Explorer into the upload area.

Choose a Compression Level

Pick Smallest Size, Balanced, or Best Quality depending on how the file will be used.

Click Compress PDF

Our server re-encodes the document's images and rewrites its structure, usually within seconds.

Download the Smaller File

Save your compressed PDF — same pages and layout, a fraction of the size.

Recommended Tool: Compress PDF

Reduce file size while preserving visual quality.

Open Compress PDF

Get Better Results

Tips

Match the Preset to the Purpose — Use Smallest Size for quick, informal sharing, and Best Quality when the document is going to professional print.
Don't Compress Twice — Running an already-compressed PDF through compression again rarely reduces size further and can slightly reduce image quality unnecessarily.
Windows Defender or antivirus software occasionally flags downloaded PDF utilities as unfamiliar — a browser-based tool sidesteps that entirely since nothing is installed.
If you're on a work or school Windows PC, IT policy often blocks installing new software; a browser tool works even under locked-down permissions.

Avoid These

Common Mistakes

Uploading a file that is already password-protected without unlocking it first — most operations require an unencrypted starting file.
Assuming a converted or compressed file replaces the need for the original — keep your source file until you have confirmed the result looks right.
Not checking the 50 MB upload size limit before starting, then wondering why a very large scan fails to upload.
Downloading a third-party Windows utility from an unfamiliar site instead of using a browser — a common source of bundled adware.