What is nzb

Last updated: April 1, 2026

Quick Answer: NZB is a file format used for downloading binary files from Usenet newsgroups. NZB files contain metadata that clients use to retrieve files from Usenet servers.

Key Facts

NZB stands for 'Newzbin,' named after the original Newzbin website
NZB files are XML-based metadata files that contain index information
NZB clients use the metadata to automatically download files from Usenet
NZB format became popular in the early 2000s as an alternative to manual newsgroup browsing
Modern NZB clients include SABnzbd, NZBGet, and Newsbin

What is an NZB File?

An NZB file is an XML-based file format that serves as a container for metadata related to binary files stored on Usenet newsgroups. The acronym NZB originates from Newzbin, a website that pioneered the distribution of these files. Rather than containing the actual binary data, an NZB file acts as a roadmap or index that tells downloading clients exactly where to find and how to retrieve files from Usenet servers.

How NZB Files Work

When you download an NZB file, you're receiving a small text file containing segments and post information. NZB clients read this metadata and automatically connect to Usenet servers to download the referenced binary files. The client reconstructs the files by downloading individual segments and combining them. This automated process is much more convenient than manually searching through newsgroups and downloading files piece by piece.

Common NZB Clients

Several applications have been developed to handle NZB files. Popular clients include:

SABnzbd - An open-source NZB client with a web interface
NZBGet - A lightweight, efficient NZB downloader
Newsbin - A comprehensive usenet client for Windows
Synology NZBGet - Integrated NZB support for NAS devices

NZB Format and Structure

NZB files are structured in XML format, making them human-readable and easy to parse. Each file contains information about the binary files it references, including segment numbers, article IDs, and server information. This standardized format allows different clients to interpret the same NZB file consistently.

Usenet and NZB History

Usenet is a distributed discussion system that has existed since 1979, predating the modern internet. While primarily used for discussion groups, Usenet also became popular for binary file distribution. The NZB format emerged as a solution to simplify the process of finding and downloading these binaries, becoming the de facto standard for automated Usenet downloading.

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Sources

Wikipedia - Usenet CC-BY-SA-4.0
SABnzbd Official Website GPL