Project Summary
aria2 is a utility for downloading files. The supported protocols are HTTP(S), FTP, BitTorrent (DHT, PEX, MSE/PE), and Metalink.
It can download one or more files individually or from multiple sources/protocols at the same time and tries to utilize your maximum download bandwidth (by using multiple threads and downloading data from HTTP(S)/FTP, while also uploading to the BitTorrent swarm).
Using Metalink's chunk checksums, aria2 automatically validates chunks of data while downloading a file like BitTorrent.
The physical memory usage is typically 3MB(normal HTTP/FTP downloads) to 6MB(BitTorrent downloads). CPU usage in BitTorrent with download speed of 1500KB/sec is around 6%.
In a Nutshell, aria2...
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has a well established, mature codebase
maintained by a small development team
with decreasing Y-O-Y commits -
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took an estimated 33 years of effort (COCOMO model)
starting with its first commit in February, 2006
ending with its most recent commit about 1 month ago
Quick Reference
GNU General Public License v2.0 or later
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Forbidden
Sub-License
Hold Liable
Required
Distribute Original
Disclose Source
Include Copyright
State Changes
Include License
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
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30 Day SummaryDec 2 2025 — Jan 1 2026
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12 Month SummaryJan 1 2025 — Jan 1 2026
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