Compress PDF
Compress PDF files to reduce file size. Optimize PDFs for email, web, or storage. Free online PDF compressor - works locally in your browser.
Free PDF compressor that reduces file size in your browser. Choose quality level, see savings percentage. No uploads, instant results.
- ✓ Three compression levels: High Quality, Medium, Maximum
- ✓ Shows before/after file size comparison
- ✓ Processes locally - files stay on your device
- ✓ Optimizes PDF structure and images
- ✓ No file size limits
How to Compress a PDF File
- 1 Upload your PDF file by clicking or dragging
- 2 Select compression level: High Quality, Medium, or Maximum
- 3 Click 'Compress PDF' to start compression
- 4 Review the file size reduction
- 5 Download your compressed PDF
Frequently Asked Questions
Can I merge PDFs without uploading them? ▼
Yes! MagicKit processes all PDFs directly in your browser using pdf-lib. Your files never leave your device.
Is there a file size limit? ▼
No strict limit. Since processing happens in your browser, larger files may take longer but there's no server-imposed restriction.
Will the PDF quality be reduced? ▼
No. MagicKit preserves the original quality of your PDFs. Compression is only applied when you explicitly choose it.
Can I process password-protected PDFs? ▼
Yes, use our PDF Unlock tool to remove passwords, or enter the password when prompted in other tools.
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Last updated: January 15, 2026 · v2.1