Compress PDF Files Online
Reduce PDF file size with selectable image-based compression levels.
Use the tool
Start the interactive tool on the main PDF Engine page. Selected files are processed in your browser for supported operations.
How to use Compress PDF
- Choose a PDF file.
- Select Maximum, Balanced or Light compression.
- Compare the new size and inspect text and image quality before using it.
When it is useful
Compression can help scanned documents and photo-heavy PDFs fit email or upload limits.
Important limitations
This tool rasterizes pages into images, so text may no longer be selectable or searchable. If the result is larger, the source may already be optimized. Keep the original.
Privacy and file handling
This tool is designed to process supported files locally in your browser; the static website does not provide server-side file storage. Your browser still downloads the JavaScript libraries required for some operations from third-party content delivery networks. See the Privacy Policy for details. Do not use the output without checking it, and keep your original file.
Frequently asked question
Maximum aims for smaller files; Light aims to preserve more visual detail. This is not lossless object-level compression.
Read our detailed PDF compression guide for step-by-step instructions and quality checks.
Need a different operation? Browse all PDF Engine tools or read our PDF guides.