Compress Pro

Compress Pro とは？

One free, open-source app for compressing and converting images, video, audio and PDFs, 47 tools that run entirely in your browser. There is no upload step at all: compression happens on your device, so files never leave it. No ads, no accounts, no size limits. It even works offline, compress a file, switch your connection off, compress another. Free forever, because there are no server costs to pass on.