Compress PDF Online Free
Reduce your PDF file size while maintaining quality. Perfect for email attachments and web uploads.
How to compress PDF files
- Upload your PDF file by dragging it or clicking to browse
- Select the compression level (low, medium, or high)
- Click "Compress PDF" to start the compression
- Download your compressed PDF file
Compression levels
Low compression
Maintains highest quality with minimal size reduction. Best for documents with important images.
Medium compression (Recommended)
Good balance between file size and quality. Suitable for most documents.
High compression
Maximum size reduction. Some quality loss may occur. Best for text-heavy documents.
Frequently Asked Questions
How much can I reduce my PDF file size?▼
The compression ratio depends on your PDF content. Documents with many high-resolution images can often be reduced by 50-80%. Text-heavy documents with few images may see smaller reductions of 10-30%.
Will compression affect my PDF quality?▼
Low and medium compression levels preserve most quality. High compression may reduce image quality but keeps text sharp. For important documents, we recommend starting with medium compression and checking the result.
Can I compress password-protected PDFs?▼
You'll need to unlock the PDF first using our Unlock PDF tool. Once unlocked, you can compress it normally. After compression, you can protect it again using our Protect PDF tool.
Why is my compressed file the same size?▼
Some PDFs are already optimized or contain mostly text and vector graphics, which don't compress much further. The tool shows you the size before and after compression so you can compare.
Your files are secure
All processing happens in your browser. Your files are never uploaded to any server.
Related PDF Tools
Explore more free PDF tools to help you with your documents: