Are my files uploaded?

No. Compression runs entirely in your browser — your file never leaves your device.

Will compressing reduce the quality?

No. This is lossless, structural compression — it rewrites the PDF more efficiently without touching image quality. If a file can't be made smaller, you get the original back unchanged.

Compress PDF — Shrink PDF file size online, privately

How to compress a PDF

Drop the PDF you want to shrink — or click to choose it.
Click Process. We losslessly rewrite the PDF's structure for a smaller file.
Download the result. You'll see exactly how much smaller it got.

Your file never leaves your device — compression runs entirely in your browser.

Frequently asked questions

Does compressing lower the quality? No. This tool uses lossless, structural compression — it never re-encodes or downsamples images, so quality is untouched. If a file is already optimized, you get it back unchanged rather than a larger one.

Do you upload my files? No. This tool processes everything locally in your browser.