What Is PDF Compressor?
PDF Compressor reduces the file size of your PDF documents while preserving visual quality. Whether you need to meet email attachment limits, speed up page loads, or save storage space, this tool handles compression without degrading readability.
How to Use This Tool
Upload your PDF, choose a compression level (low, medium, or high), and click compress. The tool processes your file in-browser using client-side JavaScript, then provides a download link with the compressed result. You’ll see the before-and-after file sizes so you can gauge the reduction.
Why Use PDF Compressor?
Most online compressors upload your files to remote servers, creating privacy risks for sensitive documents. This tool runs entirely in your browser — no data leaves your device. There are no file size caps, no watermarks, and no account required. For a detailed walkthrough, see our step-by-step guide.
The compression engine used here applies the same standard PDF object-stream and image-recompression techniques that a desktop tool like Acrobat or a server-side library like Ghostscript would apply, but the entire pipeline runs locally in the browser. That matters most for the files that are most commonly compressed — signed contracts, scanned tax returns, medical records, board decks — because those are exactly the files no operator should be uploading to a free third-party service in the first place. Output quality is configurable: a single preset slider that maps to image DPI and JPEG quality factors, with a side-by-side preview so you can see the cost in detail before saving.
Frequently Asked Questions
Built by Derek Giordano · Part of Ultimate Design Tools