aria2 Try It

Lightweight multi-protocol & multi-source, cross platform download utility.

Website Documentation Source

Category: Network
License: GPL2
Platforms: Windows macOS Linux
Released: 2015
Path: c:\aria2\aria2c.exe
Benefits: Supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.
Notes: ultra fast download utility

Version
Latest known: 1.37.0 (2023-11-15)

Examples

1. Download all URLs to the local directory

aria2c.exe -i uris.txt

2. Download using 2 connections per host

aria2c.exe -x2 http://a/f.iso

3. Download from 2 hosts

aria2c.exe http://a/f.iso ftp://b/f.iso

Try it

Download a small file to a sandboxed temp dir
Run aria2c against a small, well-known public URL (example.com's root page), write the result to a UUID-named temp directory via -d/-o so nothing lands in a shared location, read the downloaded body back into the page, then delete the sandbox. Uses --quiet to silence the progress meter and --file-allocation=none to skip pre-allocation (fine for tiny files). Output panel shows the downloaded HTML with a 'Preview HTML' button; Result panel shows the bytes count and a confirmation that the sandbox was wiped.

Agree to terms to run demos.

# aria2 - Help

Source: https://aria2.github.io/

```
Usage: aria2c [OPTIONS] [URI | MAGNET | TORRENT_FILE | METALINK_FILE]...
Printing options tagged with '#basic'.
See 'aria2c -h#help' to know all available tags.
Options:
-v, --version Print the version number and exit.

Tags: #basic

-h, --help[=TAG|KEYWORD] Print usage and exit.
The help messages are classified with tags. A tag
starts with "#". For example, type "--help=#http"
to get the usage for the options tagged with
"#http". If non-tag word is given, print the usage
for the options whose name includes that word.

Possible Values: #basic, #advanced, #http, #https, #ftp, #metalink, #bittorrent, #cookie, #hook, #file, #rpc, #checksum, #experimental, #deprecated, #help, #all
Default: #basic
Tags: #basic, #help

-l, --log=LOG The file name of the log file. If '-' is
specified, log is written to stdout.

Possible Values: /path/to/file, -
Tags: #basic

-d, --dir=DIR The directory to store the downloaded file.

Possible Values: /path/to/directory
Default: C:\CFusionExtra\aria2
Tags: #basic, #file

-o, --out=FILE The file name of the downloaded file. It is
always relative to the directory given in -d
option. When the -Z option is used, this option
will be ignored.

Possible Values: /path/to/file
Tags: #basic, #http, #ftp, #file

-s, --split=N Download a file using N connections. If more
than N URIs are given, first N URIs are used and
remaining URLs are used for backup. If less than
N URIs are given, those URLs are used more than
once so that N connections total are made
simultaneously. The number of connections to the
same host is restricted by the
--max-connection-per-server option. See also the
--min-split-size option.

Possible Values: 1-*
Default: 5
Tags: #basic, #http, #ftp

--file-allocation=METHOD Specify file allocation method.
'none' doesn't pre-allocate file space. 'prealloc'
pre-allocates file space before download begins.
This may take some time depending on the size of
the file.
If you are using newer file systems such as ext4
(with extents support), btrfs, xfs or NTFS
(MinGW build only), 'falloc' is your best
choice. It allocates large(few GiB) files
almost instantly. Don't use 'falloc' with legacy
file systems such as ext3 and FAT32 because it
takes almost the same time as 'prealloc' and it
blocks aria2 entirely until allocation finishes.
'falloc' may not be available if your system
doesn't have posix_fallocate() function.
'trunc' uses ftruncate() system call or
platform-specific counterpart to truncate a file
to a specified length.

Possible Values: none, prealloc, trunc, falloc
Default: prealloc
Tags: #basic, #file

-V, --check-integrity[=true|false] Check file integrity by validating piece
hashes or a hash of entire file. This option has
effect only in BitTorrent, Metalink downloads
with checksums or HTTP(S)/FTP downloads with
--checksum option. If piece hashes are provided,
this option can detect damaged portions of a file
and re-download them. If a hash of entire file is
provided, hash check is only done when file has
been already download. This is determined by file
length. If hash check fails, file is
re-downloaded from scratch. If both piece hashes
and a hash of entire file are provided, only
piece hashes are used.

Possible Values: true, false
Default: false
Tags: #basic, #metalink, #bittorrent, #file, #checksum

-c, --continue[=true|false] Continue downloading a partially downloaded
file. Use this option to resume a download
started by a web browser or another program
which downloads files sequentially from the
beginning. Currently this option is only
applicable to http(s)/ftp downloads.

Possible Values: true, false
Default: false
Tags: #basic, #http, #ftp

-i, --input-file=FILE Downloads URIs found in FILE. You can specify
multiple URIs for a single entity: separate
URIs on a single line using the TAB character.
Reads input from stdin when '-' is specified.
Additionally, options can be specified after each
line of URI. This optional line must start with
one or more white spaces and have one option per
single line. See INPUT FILE section of man page
for details. See also --deferred-input option.

Possible Values: /path/to/file, -
Tags: #basic

-j, --max-concurrent-downloads=N Set maximum number of parallel downloads for
every static (HTTP/FTP) URL, torrent and metalink.
See also --split and --optimize-concurrent-downloads options.

Possible Values: 1-*
Default: 5
Tags: #basic

-Z, --force-sequential[=true|false] Fetch URIs in the command-line sequentially
and download each URI in a separate session, like
the usual command-line download utilities.

Possible Values: true, false
Default: false
Tags: #basic

-x, --max-connection-per-server=NUM The maximum number of connections to one
server for each download.

Possible Values: 1-16
Default: 1
Tags: #basic, #http, #ftp

-k, --min-split-size=SIZE aria2 does not split less than 2*SIZE byte range.
For example, let's consider downloading 20MiB
file. If SIZE is 10M, aria2 can split file into 2
range [0-10MiB) and [10MiB-20MiB) and download it
using 2 sources(if --split >= 2, of course).
If SIZE is 15M, since 2*15M > 20MiB, aria2 does
not split file and download it using 1 source.
You can append K or M(1K = 1024, 1M = 1024K).

Possible Values: 1048576-1073741824
Default: 20M
Tags: #basic, #http, #ftp

--ftp-user=USER Set FTP user. This affects all URLs.

Tags: #basic, #ftp

--ftp-passwd=PASSWD Set FTP password. This affects all URLs.

Tags: #basic, #ftp

--http-user=USER Set HTTP user. This affects all URLs.

Tags: #basic, #http

--http-passwd=PASSWD Set HTTP password. This affects all URLs.

Tags: #basic, #http

--load-cookies=FILE Load Cookies from FILE using the Firefox3 format
and Mozilla/Firefox(1.x/2.x)/Netscape format.

Possible Values: /path/to/file
Tags: #basic, #http, #cookie

-S, --show-files[=true|false] Print file listing of .torrent, .meta4 and
.metalink file and exit. More detailed
information will be listed in case of torrent
file.

Possible Values: true, false
Default: false
Tags: #basic, #metalink, #bittorrent

--max-overall-upload-limit=SPEED Set max overall upload speed in bytes/sec.
0 means unrestricted.
You can append K or M(1K = 1024, 1M = 1024K).
To limit the upload speed per torrent, use
--max-upload-limit option.

Possible Values: 0-*
Default: 0
Tags: #basic, #bittorrent

-u, --max-upload-limit=SPEED Set max upload speed per each torrent in
bytes/sec. 0 means unrestricted.
You can append K or M(1K = 1024, 1M = 1024K).
To limit the overall upload speed, use
--max-overall-upload-limit option.

Possible Values: 0-*
Default: 0
Tags: #basic, #bittorrent

-T, --torrent-file=TORRENT_FILE The path to the .torrent file.

Possible Values: /path/to/file
Tags: #basic, #bittorrent

--listen-port=PORT... Set TCP port number for BitTorrent downloads.
Multiple ports can be specified by using ',',
for example: "6881,6885". You can also use '-'
to specify a range: "6881-6999". ',' and '-' can
be used together.

Possible Values: 1024-65535
Default: 6881-6999
Tags: #basic, #bittorrent

--enable-dht[=true|false] Enable IPv4 DHT functionality. It also enables
UDP tracker support. If a private flag is set
in a torrent, aria2 doesn't use DHT for that
download even if ``true`` is given.

Possible Values: true, false
Default: true
Tags: #basic, #bittorrent

--dht-listen-port=PORT... Set UDP listening port used by DHT(IPv4, IPv6)
and UDP tracker. Multiple ports can be specified
by using ',', for example: "6881,6885". You can
also use '-' to specify a range: "6881-6999".
',' and '-' can be used together.

Possible Values: 1024-65535
Default: 6881-6999
Tags: #basic, #bittorrent

--enable-dht6[=true|false] Enable IPv6 DHT functionality.
Use --dht-listen-port option to specify port
number to listen on. See also --dht-listen-addr6
option.

Possible Values: true, false
Default: false
Tags: #basic, #bittorrent

--dht-listen-addr6=ADDR Specify address to bind socket for IPv6 DHT.
It should be a global unicast IPv6 address of the
host.

Tags: #basic, #bittorrent

-M, --metalink-file=METALINK_FILE The file path to the .meta4 and .metalink
file. Reads input from stdin when '-' is
specified.

Possible Values: /path/to/file, -
Tags: #basic, #metalink

URI, MAGNET, TORRENT_FILE, METALINK_FILE:
You can specify multiple HTTP(S)/FTP URIs. Unless you specify -Z option, all
URIs must point to the same file or downloading will fail.
You can also specify arbitrary number of BitTorrent Magnet URIs, torrent/
metalink files stored in a local drive. Please note that they are always
treated as a separate download.

You can specify both torrent file with -T option and URIs. By doing this,
download a file from both torrent swarm and HTTP/FTP server at the same time,
while the data from HTTP/FTP are uploaded to the torrent swarm. For single file
torrents, URI can be a complete URI pointing to the resource or if URI ends
with '/', 'name' in torrent file is added. For multi-file torrents, 'name' and
'path' in torrent are added to form a URI for each file.

Make sure that URI is quoted with single(') or double(") quotation if it
contains "&" or any characters that have special meaning in shell.

About the number of connections
Since 1.10.0 release, aria2 uses 1 connection per host by default and has 20MiB
segment size restriction. So whatever value you specify using -s option, it
uses 1 connection per host. To make it behave like 1.9.x, use
--max-connection-per-server=4 --min-split-size=1M.

Refer to man page for more information.
```

aria2 Share Help Try It