Compress PDF Files Online Free
Make your PDFs smaller without losing quality. Compress files by up to 80% in seconds with SmallPDF.us
Select PDFs to Compress
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Up to 100MB per file | 10 files maximum
Why People Choose Our PDF Compressor
We've helped millions shrink their PDFs without compromising quality. Here's what makes us different.
Smart Image Optimization
Our technology figures out the best way to compress each image in your PDF. Photos get optimized differently than diagrams or screenshots, so you get maximum compression with minimum quality loss.
Really Fast
Even huge files compress in just seconds. We've optimized every step of the process so you're not sitting around waiting. Upload, compress, download - done.
Your Files Stay Private
Everything gets encrypted during upload. We compress your files in secure containers and delete everything automatically after one hour. Nobody can access your documents - not even us.
How to Make Your PDFs Smaller
Three simple steps to compress your documents
Pick Your Files
Upload one PDF or several at once. You can compress up to 10 files in one go.
Choose Your Setting
Pick maximum quality, balanced, or extreme compression based on what you need.
Download Smaller Files
Get your compressed PDFs instantly. They'll work exactly like before, just much smaller.
Questions People Ask
Quick answers about PDF compression
It depends on what's in your PDF and which compression setting you pick. Files with lots of images usually shrink the most - sometimes by 70% or more. Text-heavy documents won't compress as dramatically, but you'll still see a decent size reduction. Our balanced setting gives you the best mix of quality and smaller file size.
Not if you choose the right setting. Text always stays crystal clear no matter what. For images, our maximum quality mode keeps everything looking great. The balanced mode is perfect for most people - you won't notice any difference in quality. Only use extreme compression if you absolutely need the smallest possible file.
Yes, you can compress password-protected PDFs, but you'll need to enter the password during compression. After we're done compressing it, your PDF keeps the same password protection it had before.
PDFs with lots of photos, scanned documents, and graphics shrink the most dramatically. We can optimize those images really well. Text-only PDFs are already pretty efficient, so they won't get as much smaller, but we can still trim some fat. PDFs with embedded fonts and graphics fall somewhere in between.
Absolutely. Everything gets encrypted the moment you upload it. We process your files in secure, isolated containers. Then we automatically delete everything within one hour. We never look at your files, never save them permanently, and never share them with anyone.
Why Compress Your PDF Files?
Big PDF files cause all kinds of headaches. They take forever to email, use up storage space, and slow down everything. Our free compressor fixes these problems by shrinking your files dramatically while keeping them looking good.
We use smart technology that looks at each part of your PDF individually. Images get optimized differently than text. Repeated elements get deduplicated. Unnecessary data gets stripped out. The result? Much smaller files that work exactly the same as the originals.
When You Should Compress
Compress your PDFs before emailing them (most email servers have size limits), uploading to websites that restrict file sizes, storing large document collections, or sending files to people with slow internet. You'll save time, bandwidth, and storage space while making life easier for everyone who receives your files.
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