🗜️ PDF Compressor Guide

How to Compress PDF

• Step 1: Upload your PDF file (click or drag & drop)
• Step 2: Select compression quality (High, Balanced, or Maximum)
• Step 3: Click "Compress PDF" to start compression
• Step 4: View compression results and space saved
• Step 5: Download your compressed PDF file

Compression Quality Options

• High Quality (💎): Best visual quality, moderate compression (10-30% reduction)
• Balanced (⚖️): Good balance of quality and size (30-50% reduction) - Recommended
• Maximum Compression (🗜️): Smallest file size, noticeable quality loss (50-70% reduction)

Key Features

• Quality Control: Choose compression level that fits your needs
• Size Comparison: See original vs compressed file sizes
• Space Savings: View percentage of space saved
• Instant Processing: Fast browser-based compression
• No Upload: All compression happens in your browser
• 100% Secure: Files never leave your device
• Free Forever: No limits, no registration

How PDF Compression Works

• Image Optimization: Reduces quality of embedded images
• Metadata Removal: Removes unnecessary metadata
• Structure Optimization: Optimizes PDF internal structure
• Font Subsetting: Includes only used font characters

When to Compress PDFs

• Email Attachments: Reduce size to meet email limits
• Website Upload: Faster loading for web pages
• Storage Space: Save disk space on device
• Cloud Storage: Use less cloud storage quota
• Faster Sharing: Quicker file transfers
• Mobile Viewing: Easier to open on mobile devices

Common Use Cases

• Large Documents: Compress multi-page reports and presentations
• Scanned PDFs: Reduce size of scanned document images
• Photo PDFs: Compress PDFs containing many photos
• E-books: Make e-books smaller for easier distribution
• Forms: Reduce form sizes for faster submission
• Manuals: Compress product manuals and guides

Best Practices

• Keep Originals: Always save original PDF before compressing
• Test Quality: Open compressed PDF to verify acceptable quality
• Choose Wisely: Use High Quality for important documents
• Maximum for Web: Use Maximum Compression for web content
• Check File Size: Verify final size meets your requirements

Tips for Maximum Compression

• Remove Unnecessary Pages: Split PDF first to remove unneeded pages
• Convert to Grayscale: Color images take more space
• Reduce Image Quality: Use Maximum Compression setting
• Simplify Graphics: Complex graphics compress better

Privacy & Security

Your privacy is guaranteed. All PDF compression happens directly in your browser using JavaScript and the pdf-lib library. Your PDF file is never uploaded to any server, stored, or transmitted. The compression process is 100% client-side, ensuring complete privacy and security. Once you close or refresh the page, all data is permanently deleted from memory.

Technical Details

Our PDF compressor uses pdf-lib for PDF manipulation. The tool optimizes PDF structure, removes metadata, and adjusts compression settings based on selected quality level. All operations occur in your browser's memory with no server interaction required.

Compression Results Explained

• Original Size: Your PDF's starting file size
• Compressed Size: Size after compression
• Space Saved: Percentage reduction in file size

Browser Compatibility

• Chrome: Fully supported (recommended)
• Firefox: Fully supported
• Safari: Fully supported (macOS & iOS)
• Edge: Fully supported
• Opera: Fully supported

Troubleshooting

• Compression fails: Check if PDF is corrupted or password-protected
• No size reduction: PDF may already be optimized
• Quality too low: Try High Quality setting instead
• Out of memory: Close other tabs and try again
• Download not starting: Check browser's download permissions

File Size Expectations

• Text-heavy PDFs: Limited compression (10-20%)
• Image-heavy PDFs: Best compression (50-70%)
• Scanned Documents: High compression potential (40-60%)
• Already Optimized: Minimal compression possible