Can 7-Zip Decompress Files from HTTP or FTP?

7-Zip cannot natively decompress archives directly from remote HTTP or FTP network URLs through its standard user interface or command-line syntax. However, users can achieve stream-based extraction using command-line piping with external tools like curl or by mounting remote locations as local file system paths, provided the specific archive format supports sequential data streams without requiring random seeking.

Native Support Limitations

7-Zip was designed as a local file archiver. It does not contain an internal HTTP, HTTPS, or FTP client protocol stack. If you pass a URL such as https://example.com/archive.zip or ftp://example.com/archive.7z into either the 7-Zip Graphical User Interface (GUI) or the standard Command Line interface (7z.exe), the program treats the string as an invalid local file path and returns an error.

The Technical Challenge: Streaming vs. Seeking

Archive structures heavily dictate whether streaming extraction over a network is technically viable:

  • Non-Streamable Formats (.zip, .7z): Standard .zip and .7z archives store their central directory (the file index and metadata) at the end of the archive. To list or extract files, the decompression engine must jump (seek) directly to the end of the file before reading individual items. A standard sequential network stream does not allow random seeking without downloading or buffering the entire file first.
  • Streamable Formats (.tar, .gz, .bz2, .xz): Formats like tar.gz are designed for sequential reading. Metadata is stored alongside each individual file header, meaning decompressors can process data as it arrives sequentially through a network pipeline.

Workarounds for Network Extraction

1. Command-Line Piping (stdin)

You can download data from HTTP or FTP via a streaming utility like curl or wget and pipe standard output directly into 7-Zip using the -si (read from standard input) switch.

curl -s https://example.com/archive.tar.gz | 7z x -si -ttar

This method only works reliably with formats that do not require backward seeking. If you attempt to stream standard .zip or .7z files through standard input, extraction may fail unless 7-Zip can buffer the entire payload into system memory.

2. Virtual Network Mounting

To open any archive format without a full prior manual download, you can mount the remote FTP or HTTP/WebDAV server as a local drive letter using third-party mounting software such as Rclone, WinFsp, or curlftpfs.

When mounted, the software handles network byte-range requests on demand, allowing 7-Zip to seek to the end of the file to read the archive index just as it would on a physical hard drive.