Compress PDF
Reduce PDF File Size Online
Make a PDF smaller so it is easier to email, upload or store. Add one or more files, choose how hard to compress, and download the smaller version in seconds.
Private and Secure PDF Compression
Your files travel over an encrypted connection and are permanently deleted from our servers within a few hours.
Make Large PDFs Smaller
Reduce the size of a heavy PDF in seconds, right in your browser — nothing to download or install.
You Choose How Much to Shrink
Pick Best Compression for the smallest file, or Low to keep the compressed PDF as close to the original as possible.
Shrink a PDF File in Three Quick Steps
Upload your document, choose how hard to compress, and download a smaller PDF — online, in seconds.
How to Compress a PDF File Online
- Add your PDF — drop it into the box above or pick it from your device.
- Choose a compression level: Best Compression, Average, or Low.
- Click Compress and download your smaller PDF.
Compress PDF Without Losing Quality
Text and layout come through untouched — it's the images inside the document that shrink. Scans and photo-heavy reports lose the most weight, so a file that was too big to email usually fits after one pass. Not small enough? Run it again at a stronger setting.
A Secure Online PDF Compressor
Compress PDF files right in your browser — nothing to install. Your documents travel over an encrypted connection and are permanently deleted from our servers within a few hours. Start right away and upgrade when you need higher limits.
Trim the Document Before You Compress
A smaller document compresses better. Split out only the pages you need, merge the rest into one file, or build a lighter PDF straight from your images.
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Compress PDF — Frequently Asked Questions
How do I compress a PDF file online?
Add your PDF to the box above, pick a compression level, and click Compress. Your smaller PDF is ready to download in seconds.
Can I compress a PDF without losing quality?
Text and layout stay intact — it is the images inside the document that shrink. Choose Low compression to stay closest to the original, or Best Compression when the file has to meet a strict size limit.
How much smaller will my PDF get?
It depends on what is inside. Scanned pages and photo-heavy documents shed the most megabytes, while a PDF that is only text is already compact and changes far less.
Is it safe to compress PDF files with ZonePDF?
Yes. Files travel over an encrypted connection, are processed automatically, and are permanently deleted from our servers within a few hours.
Can I compress several PDF files at once?
Yes. Add up to 50 PDF files in a single batch without an account and compress them all in one go. Sign in to raise the limit.
Does compressing a PDF resize the pages?
No — compressing reduces the file size in megabytes, not the page dimensions. Every page keeps its size, layout, and text; only the images inside are stored more efficiently.
