I’m in the process of trying to make posters. I’m a little bit confused about dpi and upscaling. At the moment I’m making posters on canva by creating a custom template of 84.1cm x118.9cm (which I think are the dimensions for A0) and putting the pixel size to the max on canva of 9,993 x 14,043. When I download these I’m pretty sure I get a 300 dpi. I’ve read the comments about using upscayl but I don’t think my laptop is good enough to download it on my desktop. Is my current method good enough? If not should I just list posters from A1-A5 and ignore A0?

Do dpi enhancers actually work? I’m new to all this and trying to make some posters but when I download as a jpg from canva it seems to be a low dpi. I use the free version of camva and also don’t have a great laptop so I’m not sure if this may be a reason for the low dpi.