Compress PDF

Free Online PDF Compressor

Need to make a PDF file smaller? Our free PDF compressor reduces file size by stripping unnecessary metadata and optimizing the internal structure of your document. The visible content — text, images, and layout — stays the same while the file becomes lighter and easier to share.

How to Compress a PDF File

1. Click the upload area or drag and drop your PDF file.
2. Click the Compress PDF button.
3. Review the original size, compressed size, and percentage saved.
4. Download the compressed file instantly.

Tips and Best Practices

• PDFs with lots of embedded metadata, duplicate objects, or bloated internal structures see the biggest file size reductions.
• Already-optimized files may only see a small reduction — this is normal and means the file was already well-compressed.
• If you need to compress images within a PDF more aggressively, consider re-exporting the document from the original application with lower image quality settings.
• The recommended maximum file size is 50 MB. Larger files will work but may take longer depending on your device.

Common Use Cases

Email providers often limit attachment sizes to 10-25 MB, making PDF compression essential for sending large documents. Students compress assignments and research papers before uploading to learning platforms with file size limits. Businesses reduce invoice and contract sizes for faster sharing and storage. Website owners compress PDF downloads to improve page load times for their visitors.

Why Use Our PDF Compressor?

• 100% free with no watermarks, no file limits, and no registration.
• Your files are processed entirely in your browser — nothing is uploaded to any server, so your documents stay private.
• The compressor preserves the visual quality of your document while reducing file size.
• Works on any modern browser across all devices — desktop, tablet, and mobile.
• Instant results with no waiting in a queue.