Yes. Kopitiam runs in your browser and is funded by ads — no export paywall, no watermark, no sign-up.

Do my files get uploaded?

No. Compression happens entirely in your browser; your PDF never leaves your device.

What is the difference between the compression modes?

Lossless re-saves the PDF and keeps text selectable, with modest savings. Shrink photos also makes the JPEG photos inside the PDF smaller, still keeping text selectable — the best choice for documents with pictures. Strong re-encodes each page as an image for the biggest savings on scans, but the text is no longer selectable.

Compress PDF

Make a PDF smaller — free, in your browser. Your file never leaves your device.

Drop a PDF here

or click to choose a file. Everything stays on your device.