TAR bundles files without compressing them, while ZIP both bundles and compresses. TAR is the Unix tradition; ZIP is more common on Windows.
Yes. Files to TAR is completely free with no sign-up, no watermarks and no usage limits.
No. Files to TAR runs entirely in your browser, so your data never leaves your device.
Only your device's available memory — there are no server-side limits because nothing is uploaded.
Bundle multiple files into a single uncompressed TAR archive.