Compress PDF
Reduce PDF file size while maintaining quality. Perfect for email attachments and uploads.
Shrink PDFs to a fraction of their size with no visible quality loss.
or drop the pdf here
100% Private
Instant Processing
Browser-Based
Compress PDF Online with PDFSub
Features
Significant size reduction
Maintains readability
Removes unused metadata
Fast compression
No visible quality loss
Ideal for email attachments
Powered by PDFSub Engine
Files encrypted during transfer, auto-deleted after processing
How It Looks
Original Size
Compressed
How It Works
1
Upload your PDF file
2
Our tool analyzes and optimizes
3
Review the size reduction
4
Download your compressed PDF
Common Use Cases
Reducing email attachment size
Meeting upload size limits
Saving storage space
Faster document sharing
Frequently Asked Questions
How much can I reduce my PDF file size?
Compression results vary depending on the content. PDFs with high-resolution images typically see the greatest reduction, often 50-80% smaller.
Will compression affect text quality?
No, text remains sharp and clear. Our compression primarily optimizes images and removes unnecessary metadata while preserving readability.
Is there a file size limit for compression?
Yes - uploads are capped at 100 MB per file. For larger PDFs, split them first with the Split PDF tool, compress each part, then merge the compressed parts back together.
Is my file processed securely?
Your files are processed securely by the PDFSub Engine - an isolated server with no internet access. Files are encrypted during transfer and auto-deleted after processing.
Can I compress password-protected PDFs?
You would need to unlock the PDF first using our Unlock tool, then compress it. You can re-apply password protection afterward.