Saving map with higher resolution

So I've made a few maps for some RPGs I've been running. But no matter how large or small a map I make, when I save it as a jpg the resolution is horrible and zooming in just makes it worse, so I can't use the maps on the tablet I use for DMing.
I've searched the forum and a few other places but cannot find a solution to this problem.
Do any of you have any advice for me please?
Thanks muchly ^.^

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