Compress PDF for Free
Reduce your PDF file size without losing quality. No extra software needed — just quick steps, top results.
Supports PDF
Size up to 100 MB
How to compress a PDF file
Upload your file
Drag and drop your PDF document, or select it from your device.
Wait a few seconds
Our online PDF compressor will handle everything for you.
Download your compressed PDF
Get your smaller size PDF file ready for sharing and storing.
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Compress file size to 100KB keeping text and visuals clear.
Why choose our free PDF compressor
Fast compression
Our online PDF compressor delivers results in seconds, whether you're working with small files or compressing large PDFs.
Quality preservation
Your document structure, images, and formatting stay intact — reduce PDF size without losing quality.
Sharp text output
Text, graphics, and visual elements remain crisp and clear after PDF compression, perfect for professional documents.
Simple workflow
No complicated menus or settings to figure out. Upload your file, compress it, and download — no sign up required.
Works on any device
Compress PDF online from Mac, Windows, iPhone, Android, or Linux — the platform adapts to any screen.
Safe file handling
Your files are protected throughout the entire process using trusted security practices.
Check out our free PDF compressor
Frequently asked questions
How do I check my PDF file size?
Before learning how to make a PDF smaller, you can check the size of your file by right-clicking on the document and viewing its properties or info. Our online tool also lets you analyze your PDF after uploading (in the dashboard).
What size PDFs can I compress?
You can compress PDF files up to 100 MB in size, which comfortably covers most everyday documents and typical use cases.
Can I compress a PDF without losing quality?
Yes. Our PDF compressor uses smart algorithms that remove unnecessary data and reduce PDF size while preserving the visual quality of your document. Text stays sharp, and images maintain their clarity — making it the best solution for professional files.
Can I compress PDF free of charge?
Yes. OnlyDoc lets you compress PDF free of charge directly in your browser. Simply upload your file, choose your compression level, and download the optimized document — no software installation or payment required.
Why would you need to compress PDFs?
Since PDFs can get pretty heavy in size, you might face limitations when sharing them. For example, if you have a PDF that's larger than 50 MB, you might not be able to upload it to certain websites. You might even have trouble emailing it, depending on which email service you use. PDF compression helps you optimize your documents so they are easier to share and take up less space on your hard drive. In some cases, this can literally halve the file size!
What platforms does OnlyDoc compression tool support?
Our software works on any platform — Mac, Windows, Android, iPhone, and Linux. Whether you're on a desktop computer or mobile device, you can compress PDF online directly in your browser without downloading any software.
How long does it take to compress a PDF?
In most cases, the compression takes just a few seconds. Larger or more complex PDF files may take a bit longer, but the process usually stays fast — under 30 seconds even for demanding documents.