Windows PC

Compress a PDF on Windows 10 or 11 (free, no upload)

Quick answer: Windows 10 and 11 have no built-in way to compress a PDF, and Microsoft Print to PDF rarely makes one smaller. Open this page in Edge or Chrome, add the PDF, pick a target (2MB, 5MB, 10MB, 25MB or your own size from 0.1MB) and click Compress to target. Your browser does the work on your PC, so the file is not uploaded, and it is free for one PDF at a time up to 50MB.

Steps last checked 18 October 2026 by the PDFWhisk team

At a glance

Use this page to compress files quickly with a guided workflow.
Accepted input: .pdf.
Output: downloadable files generated in-browser for supported workflows.

2MB preset 10MB preset

Local processing No server file storage Mobile-friendly

Upload Choose your file
Process Runs locally
Download Save result

Drop your files here

or tap to browse · accepts .pdf

Runs in your browser. No file uploads for supported tools.

Best on desktop for 100MB+ files · mobile recommended under ~100MB.

Runs locally No file uploads No server storage

How local processing works

Your PDF is processed in your browser using local JavaScript libraries.
PDFWhisk does not upload your file to a processing server for supported tools.
Only normal page assets load from the site (HTML/CSS/JS), not your document contents.

Read the privacy proof

Support: contact form (reply in ~24h)

Security & privacy details

How this tool helps

Reduce the file size of your PDF documents right in your browser. Pick a target size (2MB, 5MB, 10MB, 25MB or a custom size from 0.1MB) and PDFWhisk tries up to seven quality passes, from very high to very heavy compression, stopping at the first one under your target. Compression turns each page into an image to shrink the file: text stays readable but won't be selectable or searchable, and links and form fields are not kept. Scanned documents and photo-heavy PDFs shrink the most; a typed, text-only PDF may not shrink at all, and if the result would be bigger the tool keeps your original. Your PDF never leaves your device - all compression happens locally using your browser's processing power. Use it when you need to split large PDFs for portal limits, compress PDFs on iPhone, reduce email attachment size.

Best for

Email attachments Job portals Scanned documents iPhone/Android uploads

How it works

1

Open the page in Edge or Chrome on your PC

No download or account is needed. The compressor runs inside the browser tab.
2

Add the PDF

Drag the PDF from File Explorer onto the upload box, or click it and browse to the file.
3

Pick a target size

Choose 2MB, 5MB, 10MB or 25MB, or type your own size in MB (0.1MB, or 100KB, is the smallest target).
4

Click Compress to target

The tool tries up to seven quality levels, from very high to very heavy compression, and stops at the first one that fits your target.
5

Download and check it

Save the new PDF, open it and zoom in on small print before you send or upload it. Keep the original.

More files today? Free covers 3 tasks a day and files up to 50MB. For unlimited tasks and bigger files, Pro passes start at £1 for 24 hours. One-off payment, no subscription, and your files still stay on your device.

Compressing PDFs on a Windows PC: what to know

Most people searching for this have a PDF that an email, job portal or government form has just rejected. Here is what Windows can and can't do, and how to get a file that fits first time.

Why can't Windows compress a PDF by itself?

Edge can open, annotate and print PDFs, but it has no option to reduce file size. Microsoft Print to PDF makes a new file from the printed pages with no compression setting, so the result can be smaller, unchanged or larger, and it drops links and bookmarks. That is why Windows users usually need a separate tool.

How does this compressor make the file smaller?

It redraws each page as a JPEG image, first at very high quality and then at progressively lower quality and resolution, up to seven passes. It stops at the first pass that fits under your target and never hands back a file bigger than the one you started with. The trade-off is that the text becomes part of the page image: it still reads normally, but it can't be selected or searched. That is fine for a signed form, a scan or a payslip going to a portal, and a reason to keep the original.

Which target size should I pick?

Many job and university portals accept 2MB or 5MB per file. For email, under 10MB is safe with most providers; Gmail allows attachments up to 25MB in total. If a scan won't reach 2MB without becoming hard to read, remove pages you don't need first with Delete Pages, or split it into two files and upload them separately.

How can I check the file isn't uploaded?

Press F12 in Edge or Chrome, open the Network tab, then run the compression. You will see the page's own small requests (such as checking your daily free-task count) but no request carrying your PDF. Our privacy-proof page walks through this step by step.

Before you upload/share

Open the PDF and check every page before you send or upload it.
Keep the original files until the recipient or portal has accepted the document.

Frequently asked questions

Can Windows 11 compress a PDF without extra software?

Not really. Windows has no PDF compressor. Printing to Microsoft Print to PDF re-creates the file without any size setting, so it is often the same size or bigger. A browser tool such as this one works without installing anything.

How small can I make the PDF?

You choose the target, from 0.1MB (100KB) upwards. Scans and photo-heavy PDFs usually shrink a lot; a PDF that is mostly typed text is often already small and may barely change.

Will I still be able to select and copy the text?

No. To reach a target size, the tool redraws each page as a compressed image, so text in the new copy can't be selected, searched or copied, and links and form fields are not kept. Keep the original for editing.

Is my PDF uploaded?

No. The PDF is opened and processed by your browser on your own computer. No request sends the file to PDFWhisk, which you can check yourself in the browser's Network panel (F12 in Edge or Chrome) while the tool runs.

Is there a file size limit?

Free covers files up to 50MB, one PDF at a time, 3 tasks a day. Very large files are processed in your PC's memory, so close other heavy tabs if it is slow.

What to do next

Chain tools together for a complete workflow.

Merge PDF

Combine multiple PDF files into one document

Split PDF

Extract pages or split a PDF into multiple files

Delete Pages

Remove unwanted pages from a PDF