Put files and whole folders into a zip, or open a zip to see what is in it and save the files you want. On a phone or an iPad, where a zip attachment is often a dead end, this is the whole reason for it. The archive is read and written in this tab and never sent anywhere.
Add files one at a time or a whole folder; the folder's shape is kept inside the zip.
See what is inside before anything is extracted, then save the files you want.
It makes an ordinary zip. Any program on any system opens it. Dates are kept, folder structure is kept, and two files with the same name get numbered rather than one silently replacing the other.
It lists before it extracts. You see every entry, its size and its path first. An entry whose path tries to climb out of the folder it would land in is shown and refused, which is the trick a hostile zip plays on careless unzippers.
It does not open password-protected zips. A zip encrypted with a password is reported as such. Encryption in the zip format is either weak or proprietary, and neither is supported here; for encrypting a set of files, CAPSULE does it properly.
Big archives need memory. The whole zip is held in the browser's memory while it is open. A few hundred megabytes is fine on a computer; a phone may refuse a very large one.
Nothing leaves this tab. Files are read, compressed and written in browser memory. With a folder connected, a zip you make is filed under Sovereign Suite/PACK.
On a computer, you should. On a phone or an iPad, opening a zip attachment is often a dead end, and the sites that offer to unzip it for you keep a copy of everything inside. This does the same job on the device.
No. Only zip. Those formats need different code, and the zip format covers nearly every attachment and download that arrives compressed.
Yes, with a short pause between each so the browser does not mistake it for a popup storm. The browser may ask once whether to allow several downloads; say yes and press again for the rest.
No. Open the network tab in your browser's developer tools and watch nothing go out while you pack or open an archive.