I use Peakd.com front-end, so I can't say I've noticed any problems with your thumbnails. 😜
Thank you for this, I'm still learning when it comes to Canva. I need to look at the different options for templates a bit more. Wondering if I can edit photos to try and make them a little sharper with it too...
RE: the EASY way to make a thumbnail for a HIVE BLOG - Full walkthrough