While it is difficult to say for sure without a higher quality photo, I am almost certain this is a spider.
This is because spiders have clear definition between the head and the abdomen, with an obvious cephalothorax. The animal in your photo shows this pattern, as you will see in the following diagram from Wikipedia (1 = legs, 2 = cephalothorax, 3 = abdomen). In addition, spider legs all come from roughly the same point on the body.
Image attribution: Kaldari, Public domain, via Wikimedia Commons.
Ticks on the other hand, have limited definition between the abdomen and the cephalothorax, showing only the head (capitulum) as a tiny point on the scutum (abdomen and thorax as one part), as in the following image from a Purdue University page (Authors: Catherine Hill and John MacDonald). The legs on ticks come from several points along the body.