ZIP Contents Viewer

No. It only lists what is inside the archive. The tool reads the ZIP's central directory, which records each entry's name and sizes, so it never decompresses or writes out any file. To get the actual contents you still need to unzip the archive.

No. The archive is read and parsed entirely in your browser using JavaScript. Nothing is sent to a server, so even private or sensitive archives stay on your device.

Every ZIP ends with a small index called the central directory. It stores one record per file with the name, compressed size, original size and compression method. The viewer reads that index directly, which is fast and needs no decompression.

They are compression methods. Stored means the file was added as-is with no compression, so its compressed and original sizes match. Deflate is the usual ZIP compression, so the compressed size is smaller. Other methods are shown by their numeric id.

ZIP archives can store directory entries, whose names end with a slash and have zero size. The viewer flags these as directories so you can tell them apart from real files in the listing.

It reads standard ZIP archives, including those made by Windows, macOS, and common tools. It needs a valid end-of-central-directory record; if that is missing or the file is not actually a ZIP, it reports that the file is not a valid ZIP.