A tape archive, and it does exactly what the name suggests: bundles files together in order without compressing anything. On its own it saves no space. It's the first half of nearly every Unix archive, and what build pipelines and Docker expect to be handed.

Every conversion below runs in this page, on your own machine. Nothing is uploaded, there is no queue, and there is no account to make. Pick a target format, or just drop a TAR file above and choose afterwards.