Compress PDF Online — Reduce File Size

Shrink large PDF documents by up to 85% with smart object stream deflation, selective image downsampling, and custom compression presets.

Drop your PDF file here to compress
Supports oversized PDFs • Up to 100MB • 100% Free & Private
Compressing PDF...

Deflating object streams and optimizing embedded graphics

COMPRESS
document.pdf
0 MB original size

Recommended

Optimal

Best balance between crisp visual quality and file size reduction (150 DPI, 75% quality).

Extreme

Smallest

Maximum compression for the smallest file size (90 DPI downsampling, 50% quality).

Less Compression

High Quality

High quality output with light stream compression (220 DPI, 90% quality).

Target DPI:
Quality:

How to Compress and Shrink PDF Files in 3 Steps

Reduce document size for email attachments and web upload portals.

1

Upload PDF

Drag and drop your oversized PDF into the compression dropzone.

2

Select Compression Preset

Choose Recommended, Extreme, or Low compression, or tune DPI downsampling and quality manually.

3

Download Optimized PDF

Click "Compress PDF" and download your reduced document with instant savings analytics.

Frequently Asked Questions About PDF Compression

Learn how PDF compression works without losing clarity.

How much can PDF Compressor reduce my file size?+
Most PDF documents see a file size reduction between 40% and 85%, depending on the volume of embedded images, uncompressed fonts, and redundant metadata streams.
Will compressing a PDF make the text blurry?+
No. Vector typography and fonts remain sharp and crisp. Compression focuses on deflating internal object streams and optimizing bitmap image streams.
Can I convert images to grayscale for maximum file size reduction?+
Yes, toggling "Convert images to Grayscale" strips color channels, drastically reducing file size for black-and-white documents, invoices, and scanned receipts.