Compress PDF Free Online - Reduce File Size Fast

Optimize your PDF documents by reducing their file size while maintaining visual quality.

Click to select files or drag and drop

One or more PDF files

Your files never leave your device.

How to Compress PDF Files

1

Upload PDFs

Click or drag and drop multiple PDF files you want to compress.

2

Choose Settings

Select compression level (Light, Balanced, or Extreme).

3

Reduce File Size

Click 'Compress PDF' to optimize your files instantly.

4

Download

Save your compressed PDFs - up to 90% smaller while maintaining quality.

Why use ApexPDF to Compress PDF Files?

Large PDF files can be difficult to share via email or upload to websites. ApexPDF solves this problem by offering a free, advanced PDF compression tool. Our smart compression algorithms significantly reduce file size while preserving document quality, making sharing seamless.

We value your privacy. Unlike other services, ApexPDF compresses files locally on your device using WebAssembly technology. Your documents are never sent to a remote server.

Smart Compression

Choose between 'Condense' for optimized structure or 'Photon' for image-heavy documents.

Secure & Private

Compression happens in your browser. No data leaves your computer.

Flexible Controls

Adjust compression levels from Light to Extreme, and fine-tune image quality settings.

Batch Processing

Compress multiple PDF files simultaneously to save time.

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Frequently Asked Questions

What's the difference between Condense and Photon?

Condense removes dead-weight, optimizes images, and subsets fonts - best for most PDFs. Photon converts pages to images - ideal for photo-heavy/scanned PDFs but makes text non-selectable.

Which compression level should I use?

Balanced (recommended) offers great size reduction with minimal quality loss. Use Light to preserve maximum quality, Aggressive for smaller files, or Extreme for maximum compression.

Are there file size limits?

No limits! Compress as many PDFs as you need, of any size, completely free.