Can aria2 Limit Overall Upload Speed?

This article explains how to manage and limit the total upload bandwidth in the aria2 download utility. It covers the specific configuration parameters needed to restrict global upload speeds, provides practical examples for implementation, and highlights how to apply these limits across different downloading environments.

The Short Answer: Yes

Yes, aria2 can absolutely limit the overall (global) upload speed. This is incredibly useful for preventing the utility from consuming all of your network’s upstream bandwidth, which can cause high latency and lag in other applications like gaming, browsing, or video calls.

The exact parameter used to control this is:

--max-overall-upload-limit

How to Use the Parameter

The --max-overall-upload-limit parameter sets the maximum overall upload speed for all active downloads combined. You can specify the speed using standard size suffixes like K (kilobytes) or M (megabytes). Setting the value to 0 disables the limit entirely.

Command Line Examples

If you are running aria2 directly from the terminal, you append the parameter to your command:

Configuration File Method

If you run aria2 as a daemon or prefer not to type the limit every time, you can add it permanently to your aria2.conf configuration file. Open your configuration file and add the following line:

max-overall-upload-limit=500K

Once saved, aria2 will automatically respect this 500 KB/s limit every time it starts up.

Per-Download Limits vs. Global Limits

It is important to distinguish between global limits and individual torrent limits, as aria2 offers parameters for both:

For example, if you set --max-upload-limit=50K and have 5 active downloads, your total upload speed could reach 250 KB/s. However, if you also set --max-overall-upload-limit=150K, aria2 will ensure the sum of all 5 uploads never exceeds 150 KB/s, dynamically throttling the individual tasks as needed.