Great mentions so far! Coming from a product testing background, I’d add a slightly different perspective. While not a typical hosting tool, LambdaTest has actually been handy for me when working with web-optimized image previews. It may not be one of the most obvious simple, straightforward alternatives to Imgur, but it serves a specific purpose really well.
If you’re working on a web project and need to see how your images render across different browsers and devices, you can upload them inside LambdaTest. From there, you can grab links, test responsive behavior, and even share previews with teammates. It’s less of a quick uploader and more of a testing-friendly solution—especially useful if your work goes beyond just uploading and into presentation or QA workflows.