Compressing PDF...
Rendering pages to canvas
AI-Powered Processing

Compress PDF

Reduce PDF file size online for free. Canvas-based compression re-encodes images for smaller files. 100% secure - processed locally in your browser.

Advertisement

Upload your PDF file

Drag & drop your PDF here or click to browse

document.pdf

Size: 2.5 MB | Pages: 10

Choose compression level:

Low Light compression - 80% quality
Medium Good compression - 60% quality
High Max compression - 40% quality

AI is optimizing your PDF...

Compression Complete!

Your PDF has been optimized with canvas-based image re-encoding

2.5 MB
Original
-40%
Saved
1.5 MB
Compressed

Secure Processing

All compression happens in your browser. Files never leave your device.

Real Compression

Canvas-based re-encoding with adjustable quality (40-80%). Actually reduces file size.

100% Free

No registration, no watermarks, no limits. Completely free forever.

Advertisement
FAQ

Frequently Asked Questions

Everything you need to know about PDF compression

How does PDF compression work?

PDF compression reduces file size by optimizing images, removing redundant data, and re-encoding content. Our tool uses advanced algorithms to analyze your PDF and apply the most effective compression techniques. For images, we use intelligent re-encoding that maintains visual quality while significantly reducing file size. Text and vector elements are preserved at full quality since they don't contribute much to file size.

Will compression reduce my PDF quality?

Our compression is designed to maintain document readability and visual quality. The "Recommended" setting provides an excellent balance - reducing file size by 40-60% with minimal quality loss. "Maximum Compression" reduces size by up to 90% but may show slight quality reduction in images. Text remains sharp and readable at all compression levels.

Is my PDF data secure during compression?

Absolutely! Our PDF compressor works entirely in your browser using client-side processing. Your files are never uploaded to any server - all compression happens locally on your device. This means your sensitive documents never leave your computer, ensuring complete privacy and security.

What compression level should I choose?

Low Compression: Best for documents where every detail matters (designs, photos). Reduces size by 20-30%.

Recommended: Ideal for most documents. Reduces size by 40-60% with excellent quality retention.

Maximum Compression: Best for email attachments and web uploads. Reduces size by up to 90%.

Are there file size limits?

Since all processing happens in your browser, the main limitation is your device's memory. Most modern devices can handle PDFs up to 100MB. For very large files, we recommend splitting them first using our PDF Split tool, then compressing individual sections.

Why is my PDF not getting smaller?

Some PDFs are already optimized and can't be compressed further. This usually happens with:

  • PDFs that are mostly text with no images
  • Previously compressed PDFs
  • PDFs with vector graphics only
  • Scanned PDFs at very low resolution

Try the "Maximum Compression" setting for best results with image-heavy documents.

Guide

How to Compress PDF Files

Step-by-step guide to reducing your PDF file size

1

Upload Your PDF

Click the upload area or drag and drop your PDF file. You can select any PDF document from your computer, regardless of size.

2

Choose Compression Level

Select your preferred compression level: Low (best quality), Recommended (balanced), or Maximum (smallest size).

3

Download Compressed PDF

Click "Compress PDF" and wait a few seconds. Download your optimized file with significantly reduced size.

Pro Tip

For documents with many images, "Maximum Compression" can reduce file sizes by up to 90% while keeping text perfectly readable. Always check the preview to ensure quality meets your needs.

Related Articles

Tutorial

How to Compress PDF Files Without Losing Quality

Complete guide with best practices and tips for optimal compression.

Security

Why Client-Side PDF Processing is More Secure

Learn how browser-based tools keep your documents private.