Can I zip a whole folder?

Yes — drop a folder (or pick one with Add a folder) and its structure is preserved inside the archive.

Can I extract just some files?

Yes — open a zip to browse its contents, tick the files you want, and extract only those.

Not yet — encrypted archives can't be opened or created in this version.

No — compression runs in your browser via a background thread.

Create zip archives from files and folders, or open a zip and extract exactly the files you need — nothing ever uploads.