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demagnetize is a Python program for converting one or more BitTorrent magnet links into .torrent files by downloading the torrent info from active peers.

At the moment, demagnetize only supports basic features of the BitTorrent protocol. The following notable features are supported:

• BitTorrent protocol v1
• HTTP (including compact and IPv6 extensions) and UDP trackers
• magnet URIs with info hashes encoded in either hexadecimal or base32
• Fast extension (BEP 6)
• UDP tracker protocol extensions (BEP 41)

The following features are not currently supported but are planned, in no particular order:

• Encryption
• Distributed hash tables
• BitTorrent protocol v2
• x.pe parameters in magnet links
• uTP

demagnetize has also been translated by the author into Rust; you can find the Rust version at <https://github.com/jwodder/demagnetize-rs>.

Installation

demagnetize requires Python 3.10 or higher. Just use pip for Python 3 (You have pip, right?) to install it:

python3 -m pip install demagnetize

Usage

demagnetize [<global options>] <subcommand> ...

The demagnetize command has two subcommands, get (for converting a single magnet link) and batch (for converting a file of magnet links), both detailed below.

Global Options

-l LEVEL, --log-level LEVEL
	Set the log level to the given value. Possible values are "CRITICAL", "ERROR", "WARNING", "INFO", "DEBUG", and "TRACE" (all case-insensitive). [default value: INFO]

demagnetize get

demagnetize [<global options>] get [<options>] <magnet-link>

Convert a single magnet link specified on the command line to a .torrent file. (Note that you will likely have to quote the link in order to prevent it from being interpreted by the shell.) By default, the file is saved at {name}.torrent, where {name} is replaced by the value of the name field from the torrent info, but a different path can be set via the --outfile option.

Options

-o PATH, --outfile PATH
	Save the .torrent file to the given path. The path may contain a {name} placeholder, which will be replaced by the (sanitized) name of the torrent, and/or a {hash} placeholder, which will be replaced by the torrent's info hash in hexadecimal. Specifying - will cause the torrent to be written to standard output. [default: {name}.torrent]

demagnetize batch

demagnetize [<global options>] batch [<options>] <file>

Read magnet links from <file>, one per line (ignoring empty lines and lines that start with #), and convert each one to a .torrent file. By default, each file is saved at {name}.torrent, where {name} is replaced by the value of the name field from the torrent info, but a different path can be set via the --outfile option.

Options

-o PATH, --outfile PATH
	Save the .torrent files to the given path. The path may contain a {name} placeholder, which will be replaced by the (sanitized) name of each torrent, and/or a {hash} placeholder, which will be replaced by each torrent's info hash in hexadecimal. [default: {name}.torrent]