Compress PDF
Reduce your PDF file size by up to 70% while maintaining document quality. Our a...Reduce your PDF file size by up to 70% while maintaining document quality. Our advanced compression algorithm optimizes PDFs using object stream compr...
Drop your PDF here
or click to browse
Supported Formats
Input Formats
Output Formats
Compression Features
Professional PDF compression with zero quality loss
Why Use Compress PDF?
Instant Compression
Our PDF compressor works directly in your browser using advanced JavaScript algorithms. No waiting for uploads or server processing - even large PDFs compress in seconds, not minutes.
Complete Privacy
Your files never leave your device. Unlike other online compressors that upload your PDFs to servers, YaliKit processes everything locally. Your sensitive documents stay completely private.
Quality Preserved
We use lossless compression techniques that maintain 100% of your document quality. Text stays crisp, images remain sharp, and vectors stay perfect. Your compressed PDF looks identical to the original.
Save Storage Space
Free up valuable storage on your device, cloud accounts, and email. Compressed PDFs take up less space everywhere - from your hard drive to Google Drive to your email inbox.
When to Compress PDFs
Common scenarios where PDF compression helps
Email Attachments
Gmail, Outlook, and most email services have 25MB attachment limits. Compress your PDFs to send large documents without hitting size restrictions or clogging inboxes.
Cloud Storage
Maximize your Dropbox, Google Drive, or OneDrive storage. Compressed PDFs let you store more documents in the same space, potentially saving on premium storage upgrades.
Website Downloads
Website owners can offer smaller PDF downloads for faster loading and better user experience. Visitors appreciate quick downloads, especially on mobile connections.
Document Archiving
Long-term document storage becomes more manageable with compressed files. Archive years of documents without consuming excessive storage space.
How It Works
Upload Your PDF
Drag and drop your PDF file into the upload area, or click to browse from your device. We accept PDF files up to 50MB in size.
Automatic Compression
Click 'Compress PDF' and our algorithm immediately optimizes your document. The process happens entirely in your browser - your file never leaves your device.
Download Compressed File
View your compression results showing original size, new size, and percentage saved. Download your smaller PDF file instantly with no watermarks.
Pro Tips
Best Results
PDFs created from Word documents or design software typically compress better than scanned documents. Text-heavy PDFs see the biggest size reductions.
Image-Heavy PDFs
If your PDF has many images, consider optimizing the images first in the source document before creating the PDF. This can lead to even better compression.
Already Compressed?
Some PDFs are already optimized. If you see minimal compression results, the PDF was likely already compressed during creation. This is normal.
Very Large Files
For PDFs over 50MB, consider splitting them first using our Split PDF tool, then compressing each part individually for best results.
Frequently Asked Questions
Trusted by Millions
“Super fast and easy to use!”
Sarah M.
“Best free PDF tool online”
John D.
“Saves me hours every week”
Mike R.
50M+
Files Processed
2M+
Happy Users
4.9
Star Rating
99.9%
Uptime