Bigjpg is a free AI image upscaler and enlarger that can be used online or downloaded. The tool lets you upscale up to 4x for free, and up to 8x if you upgrade your account. It’s important to note that free users are limited to uploading 5mb max image size. Although it’s not the most powerful upscaler out there, Bigjpg is still a nice free tool which can be handy if you’re looking for a quick and easy AI upscaler!