Compress PDF Online

Reduce the size of your PDF files while maintaining good document quality.

Drag & Drop your PDF here

Maximum file size: 50 MB • PDF files only

Select Compression Level

Low Compression

Better PDF quality. Larger file. Suitable for printing.

Recommended

Medium Compression

Balanced quality and file size. Best for most documents.

High Compression

Maximum file-size reduction. Lower image quality. For online submission.

Compression Complete!

Original Size —

Compressed Size —

File Reduction —

Original PDF

Compressed PDF

Download Compressed PDF

Your PDF files are temporarily stored on the server only for processing and are automatically deleted after the configured retention period.

About PDF Compressor

What It Does

PDF Compressor is a free online tool that reduces the file size of your PDF documents. Upload your PDF, choose a compression level, and download a smaller version in seconds.

How Compression Works

Our server uses Ghostscript to optimize images, fonts, and internal PDF structures. Higher compression levels apply stronger image downsampling for smaller file sizes.

Supported Files

Only PDF files (.pdf) are accepted. Maximum upload size is 50 MB. Files are validated by extension, MIME type, and content.

Privacy & Security

Uploaded and compressed files are stored temporarily and automatically deleted after 30 minutes. We do not permanently store your documents. All transfers use secure processing with CSRF protection.

Developer

Alfadar J. Galib, MIT

Developer of PDF Compressor. Built to help students, offices, and communities compress PDF files quickly and securely.