There's two methods of adding an image (both produce the exact same HTML code when rendered).

Note that unlike some software that uses a similar-looking syntax, mods.factorio.com does not support any kind of image styling or resizing.

Also note that mods.factorio.com does not support alt text. Fuck people in general I suppose...

1. Inline

Useful for images used just once.

![](https://assets-mod.factorio.com/assets/01fbf8db508679ea6a65ea53d47bc166807ada4c.png)

2. Referenced

Useful for images used multiple times.

Choose a unique identifier (such as "best image id ever" in the example below) and include this line anywhere in the summary/post/document:

[best image id ever]: https://assets-mod.factorio.com/assets/01fbf8db508679ea6a65ea53d47bc166807ada4c.png

Then whenever you want to display the image:

![][best image id ever]

The id you choose ("best image id ever") is never used in the resulting HTML code.

Can you also link images from github? Like: https://github.com/Spaghenutti/Spaghetorio/blob/main/images/science-packs.png

... so my problem i guess is that i have to upload to somewhere the image in factorio.com? I would like not to have duplicates of images (one image in the gallery that then is linked like this in the summary)

The image can be hosted anywhere that serves images that permits your users/clients to access them. factorio.com is a good bet, since most Factorio users can access it (excluding Chinese people, maybe). GitHub should also be alright for hosting, even if they steal code and work with bad people.

https://github.com/Spaghenutti/Spaghetorio/blob/main/images/science-packs.png is not an image URL

Marry me!

Hehe... glad I could help <3