Compress PDF on Windows
Compress PDF on Windows without installing desktop software — ContinuePDF runs in Edge, Chrome, or Firefox on any Windows 10 or 11 PC. Skip the Adobe download and the "trial expired" prompts and compress your PDF straight from your browser. Because it needs no installation, it works even on locked-down work or school computers where you can't install programs.
Start Compress PDF NowHow to Compress PDF on Windows
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Open the tool in your browser
On your Windows PC, open Compress PDF in Edge, Chrome, or Firefox. No install, no admin rights.
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Add your PDF from File Explorer
Drag files from a File Explorer window onto the page, or click to browse your PC.
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Download the result
Process the file and compressed PDF saves to your Downloads folder.
What you can do with Compress PDF
Compressing rewrites a PDF so it takes up less space — mainly by optimising embedded images and stripping redundant data — making the file easier to email, upload, or store.
Get under an email limit
Shrink a photo-heavy PDF so it fits within a 10 MB or 25 MB attachment cap.
Speed up a web upload
Reduce a large scan before submitting it to a government portal, job application, or loan form that rejects big files.
Save storage space
Compress archived documents so a folder of scans takes a fraction of the disk or cloud space.
Share faster
Send a lighter file that downloads quickly for recipients on slow or mobile connections.
Compress PDF on Windows without extra software
Windows doesn't include a built-in tool to compress PDFs, so people usually reach for Adobe Acrobat or one of many downloadable utilities — which means installers, licenses, update nags, and sometimes bundled extras you didn't want. On a managed work or school PC you often can't install anything at all.
ContinuePDF sidesteps all of that. It runs in the browser that ships with Windows (Edge) as well as Chrome and Firefox, with nothing to install and no admin password required. Drag your PDF in from File Explorer, compress it, and download compressed PDF — and because it is all local, your documents never leave the PC.
Why choose ContinuePDF
No installer
Runs in Edge, Chrome, or Firefox — no download, no admin rights.
Works on locked PCs
Ideal for work or school computers where you can't install software.
File Explorer drag-drop
Drop files straight from a File Explorer window.
Stays on your PC
Files are processed locally and never uploaded.
Pro tip
Most of a PDF's size usually comes from scanned pages and embedded photos, not text. If a file is still too big after compressing, check whether it is a scan — reducing image resolution has the biggest effect, while a text-only PDF is already small.
Frequently asked questions
Will compressing make my PDF look worse?
At a moderate level, text and vector graphics stay sharp and the savings come from optimising images, so documents still look clean. The strongest setting works harder — it can even convert pages to images to shrink the file further, which softens photos and makes text non-selectable — so choose a moderate level when you need to keep text crisp and selectable.
Why didn't my PDF get much smaller?
If the file is mostly selectable text, it is already efficient and there is little to remove. The biggest savings come from PDFs built around high-resolution images or scans.
How do I compress a PDF on Windows?
Open Compress PDF in Edge, Chrome, or Firefox on your Windows PC, drag your PDF in from File Explorer, run the tool, and compressed PDF saves to your Downloads folder. No installation needed.
Can I use this on a work computer that blocks installs?
Yes. Because Compress PDF runs entirely in the browser with no installation, it works on managed Windows PCs where you don't have permission to install software.
Is ContinuePDF free to use?
Yes. ContinuePDF and all of its tools, including Compress PDF, are free with no signup required. Because documents are processed in your browser rather than on our servers, we can offer the full feature set at no cost.
Other ways to Compress PDF
Prefer a different device, browser, or setup? Compress PDF works the same everywhere.
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