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Compress PDF Online
Reduce File Size for Free

Reduce PDF file size significantly without losing quality. Our free online PDF compressor makes it easy to shrink large files for email and sharing.

Fast Compression
🔒
Secure
📉
Up to 90% Smaller
Quality Preserved
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Optimize your documents

Compress PDF File

Reduce PDF file size significantly without losing quality. Our free online PDF compressor makes it easy to shrink large files for email and sharing.

Drag & drop PDF here

or click to browse — max 100MB

Why compress PDF files?

Large PDF files can be difficult to email, upload, or store. Our compression tool reduces file size while maintaining document clarity, making it easier to share and manage your documents.

  • Faster upload and download speeds.
  • Meet email attachment size limits.
  • Save storage space on your device and cloud.

Compression tips

  1. Use "Balanced" mode for most documents to get the best size-to-quality ratio.
  2. For documents with many high-res images, "Low Quality" offers the maximum reduction.
  3. "High Quality" is best for documents that will be printed professionally.

Common Questions

Is it safe to compress my PDF?
Yes. Your files are processed securely and deleted from our servers automatically after compression.
How much will the file size be reduced?
It depends on the file content and selected quality. Text-heavy PDFs compress less than image-heavy ones, but you can often expect 30-80% reduction.
Can I compress multiple files?
Currently, we process one file at a time to ensure maximum speed and quality for each document.

How to Compress PDF Files

Follow these simple steps to reduce your PDF file size while maintaining quality.

Total time: PT2M
1

Upload Your PDF

Drag and drop your PDF file directly into the upload area. We support large files up to 100MB.

2

Choose Compression Level

Select your preferred quality level: High (best quality, larger file), Medium (balanced), or Low (smallest file, lower quality).

3

Compress PDF

Click the 'Compress PDF' button. Our tool will optimize your file while maintaining the quality level you selected.

4

Download Compressed File

Save your optimized PDF file to your device. The file size will be significantly reduced without major quality loss.

Common Use Cases

Discover how professionals use this tool in real-world scenarios.

Email Attachments

Reduce PDF file size to meet email attachment limits. Most email providers limit attachments to 25MB or less.

Example

Compress a 50MB presentation to under 10MB for easy email sharing.

Cloud Storage

Save valuable cloud storage space by compressing PDFs before uploading to Google Drive, Dropbox, or OneDrive.

Example

Reduce a collection of scanned documents from 200MB to 50MB.

Website Performance

Optimize PDFs for faster website loading times. Smaller files mean better user experience and SEO.

Example

Compress product catalogs from 30MB to 5MB for faster downloads.

Document Archiving

Compress old documents and reports to save disk space while maintaining readability for long-term storage.

Example

Reduce annual report archives by 70% without losing important details.

Pro Tips & Best Practices

Expert advice from PDF Optimization Specialists

Choose the Right Compression Level

quality

For documents with mostly text, use Low quality for maximum compression. For PDFs with images or graphics, use Medium or High to preserve visual quality.

Compress Before Sharing

workflow

Always compress large PDFs before sharing via email or messaging apps to avoid file size limits and ensure faster delivery.

Batch Compression

performance

If you have multiple PDFs to compress, process them one at a time with the same settings for consistent results.

Check File Size Reduction

quality

After compression, verify the file size reduction meets your needs. You can always re-compress with different settings if needed.

Secure Processing

security

Your files are processed securely with HTTPS encryption and automatically deleted from our servers after processing.

Expert Guidance

These tips come from our team of document processing engineers with over 10 years of combined experience in PDF technology, file conversion, and digital document workflows. We've processed millions of documents and learned what works best.

Why Compress PDF Files?

PDF compression is essential for modern document management. Whether you're sending files via email, uploading to cloud storage, or optimizing website performance, reducing PDF file size saves time, bandwidth, and storage space.

Advanced Compression Features

  • Intelligent Image Optimization: Automatically detects and compresses images within PDFs while preserving visual quality.
  • Adjustable Quality Levels: Choose between High, Medium, or Low compression based on your specific needs.
  • Metadata Preservation: Maintains important document metadata including author, title, and creation date.
  • Batch Processing Ready: Process multiple files with consistent compression settings.

Compression Techniques

How It Works:

Image Compression:

  • • JPEG optimization
  • • Resolution adjustment
  • • Color space optimization
  • • Duplicate image removal

Document Optimization:

  • • Font subsetting
  • • Stream compression
  • • Redundant object removal
  • • Structure optimization

What Our Users Say

Trusted by professionals worldwide for secure, reliable document conversion.

"The Image to PDF converter is exactly what I needed. It keeps the resolution high and lets me arrange my portfolio easily."

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Michael Chang
Photographer

"I convert property photos to PDF listings on my iPad while on the go. It's fast, responsive, and professional."

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Lisa Thompson
Real Estate Agent

"I use PDF Converter Pro daily for our marketing assets. It's incredibly fast and the quality is always perfect. Best of all, it's free!"

S
Sarah Jenkins
Marketing Manager • TechFlow
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Files Converted
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Files Stored
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User Rating

Frequently Asked Questions

How to compress a PDF online?

Simply upload your file to our PDF compressor, choose your desired quality level (High, Medium, or Low), and click 'Compress PDF'. Once finished, you can download the smaller file immediately.

Is this PDF compressor free?

Yes, our PDF compression tool is 100% free to use. There are no hidden fees, watermarks, or registration requirements.

How do I reduce PDF size without losing too much quality?

We recommend using the 'Balanced / Medium' setting. It offers the best compromise, significantly reducing file size while maintaining good visual quality for documents and images.

Is my file secure when I upload it?

Absolutely. We use secure connections (HTTPS) for all uploads, and your files are automatically deleted from our servers shortly after processing to ensure your privacy.

What is the maximum PDF file size?

Our tool is optimized to handle large PDF files, including those over 100MB. However, extremely large files may take longer to upload and process depending on your internet connection.

Will compression affect PDF quality?

Compression will reduce file size by optimizing images and removing redundant data. The quality impact depends on your chosen compression level. High quality maintains near-original quality, while Low quality provides maximum compression with some quality trade-off.

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Last updated: 2025-12-01 • By PDF Converter Pro Team