PDF Compressor
Reduce PDF file size by removing metadata, optimizing streams, and re-encoding. Upload a PDF and download a compressed version. Perfect for reducing file size before emailing or uploading.
- PDFs never leave your device
- No server upload required
- Works completely offline
- No login or signup needed
How It Works
Upload a PDF file and the tool analyzes it for optimization opportunities. It removes unnecessary metadata, optimizes PDF streams, and re-saves with compression settings. The tool shows before and after file sizes so you can see the reduction. Compression effectiveness depends on the PDF content - PDFs with lots of metadata or unoptimized streams compress better. The tool uses pdf-lib library for PDF manipulation. All compression happens in your browser — your PDFs are never uploaded to any server.
Frequently Asked Questions
How much compression can I expect?
Compression varies by PDF. Text-heavy PDFs with metadata can reduce 10-30%. PDFs with images compress less in browser (image compression requires server processing).
Does this reduce quality?
No! The tool removes unnecessary data and optimizes structure without reducing visual quality.
What gets removed?
Metadata (author, keywords, etc.), duplicate objects, unused resources, and unoptimized streams.
Can I compress PDFs with images?
Yes, but image compression is limited in browser. For heavy image compression, use server-based tools.
Is the compressed PDF compatible?
Yes! The output is a standard PDF that works in all PDF readers.