The feature/heading image on our blog listing page and blog posts become extremely pixelated when viewing via mobile (i.e. the image is not resizing to fit mobile).
Here is our blog: Blog (strategyfirst.com.au)
Have a look at any of the pages on your mobile and you’ll understand what I mean.
I hvae no clue how to fix this.
I add the image via the ‘Featured image’ button. Maybe that has something to do with this?
The issue does not effect any of our website pages, only our blog.
Hi @NKokot! Welcome to the Community-- happy to have you here 
Thanks for your post. I am able to recreate this image behavior on my mobile device, as well. I attached a screenshot for reference.
I found this community post and this other post with similar issues and suggestions for optimizing your images for mobile responsiveness. I recommend reviewing these threads for more context and if you still have issues, feel free to provide any additional context and we can see if some experts have any other insight!
Best,
Kennedy