Is my file uploaded to a server?

No. This tool runs entirely in your browser via WebAssembly — your file never leaves your device. You can verify this in your browser's DevTools Network tab.

Will compression reduce quality?

You choose the level. Screen is smallest; Balanced is recommended; Maximum keeps quality high. We never return a file larger than the original.

Why didn't my file get smaller?

Some PDFs are already optimized. In that case we keep your original rather than inflating it.

Compress PDF

Shrink your PDF. Choose a preset and download a smaller file.

Local processing — your files never leave your browser