Shrink PDF
Make a PDF smaller without the hassle — compress it in your browser and download instantly.
About the Shrink PDF
When a PDF is simply too big — clogging your outbox, refusing to upload, or eating your data — shrinking it is the answer. Shrinking a PDF compresses the content inside so the file occupies much less space while remaining a normal, readable PDF you can open anywhere. This tool makes it a two-step job: add the file, pick how aggressively to shrink, and download.
The savings come mainly from optimising images, which are usually what make a PDF heavy. By re-compressing them, a bulky scan-based document can often drop to a fraction of its original size. You decide the trade-off: maximum shrink for the smallest possible file, or a gentler setting that keeps images crisp when presentation matters.
Everything happens locally in your browser, so the PDF you shrink is never sent to a server — important when the document is personal or confidential, and convenient because there is no upload or queue to wait through. It is a quick, private way to get a stubborn file down to a manageable size.
Looking for more options? Open the full PDF Compressor — it’s the same tool with every feature.
Frequently Asked Questions
How do I shrink a PDF file?
Add the PDF, choose a compression level, and download the smaller version. The tool optimises the images and data inside the document to reduce its size, working entirely in your browser in just a few seconds.
Does shrinking a PDF change how it looks?
For everyday use, barely. Shrinking mainly affects image detail, and at a sensible setting the result looks the same on screen and in print. If you need pristine images, use a lighter setting; if size is all that matters, choose stronger compression.
Why is my PDF so large in the first place?
Usually because it contains high-resolution images or scanned pages stored at far more detail than needed for viewing. Text takes very little space, so image-heavy and scanned PDFs are the ones that balloon — and exactly the ones that shrink the most when compressed.
Understanding How to Shrink PDFs
Shrinking versus other size fixes
There are a few ways to deal with a big PDF: shrink (compress) it, split it into smaller files, or share it via a link instead of attaching it. Shrinking is usually the most convenient because it keeps the document whole and openable by anyone, with no special access needed. Splitting only helps if the recipient is happy with multiple files.
The role of images
Because images dominate PDF size, shrinking focuses on them — re-encoding photos and scans more efficiently and, when helpful, reducing their resolution to something appropriate for the screen. A text-only PDF is already small and will not shrink much, which is why the technique is most effective on the scanned and image-rich files that need it most.
Choosing the right level
The best compression level depends on the document’s purpose. A file you just need to email can take heavy compression, since slight image softening will not matter. A portfolio, brochure or anything to be printed at quality deserves a lighter touch. Matching the level to the use gets you the smallest acceptable file rather than the smallest possible one.