Free PDF Compress Online
Reduce PDF file size while preserving quality. Instant results, no upload to any server.
Supports PDF files · up to 100 MB
Compression Level
How It Works
- Select or drop a PDF file above.
- Choose your compression level (Light = faster, Heavy = smaller file).
- Click "Compress PDF" to process the file in your browser · nothing is uploaded.
- Download the compressed PDF immediately.
Why Compress PDFs?
Large PDF files are difficult to share, slow to upload, and waste storage space. Compressed PDFs load faster, are easier to email, and take up less disk space. This is essential for businesses managing document archives, students submitting assignments, and professionals sharing reports or presentations. PDF compression maintains document integrity while reducing file size by 10-50% depending on content.
Compression Levels Explained
- Light · Fastest processing, minimal size reduction (10-20%). Best when document integrity is critical.
- Medium · Balanced compression, moderate reduction (20-35%). Recommended for most users.
- Heavy · Maximum compression, best reduction (30-50%). Takes longer, best for large files.
Frequently Asked Questions
Does compression affect PDF quality?
Text and vector graphics remain unchanged. If your PDF contains images, the Heavy setting may reduce image quality slightly. The Light and Medium settings preserve quality well while reducing file size.
What's the file size limit?
The tool supports PDFs up to 100 MB. Processing time depends on file size and your device. Large files may take several seconds.
Is my PDF uploaded to a server?
No. All compression happens locally in your browser. Your PDF never leaves your device, ensuring complete privacy and security.
Why doesn't it compress more?
PDF compression effectiveness depends on content type. Text-only PDFs compress less because text is already efficiently encoded. Image-heavy PDFs compress more. Server-side tools can achieve additional compression by re-encoding images.
Can I compress encrypted PDFs?
This tool works with standard PDFs. Encrypted or password-protected PDFs cannot be processed without the password.