They do cost money unfortunately, but what you could do is use a tool like https://whimsical.com/wireframes to wireframe your website (free if you keep all files in your personal folder). Then use tailwindui or flowbite as a reference (or some other template library) while wireframing, skip the mockup stage, and then go straight into the coding phase? Source: 11 months ago

a preview of the image improved thanks to "letsenhance.io". Source: 6 months ago

Enhance. io- the AI-powered image enhancer that increases resolution without losing quality. Customize dimensions, improve texture, tone, color, and clarity effortlessly. Ideal for WordPress eCommerce sites, real estate, and websites with multiple similar images. Save time with automated presets and clean up images using Smart Enhance for crystal-clear visuals. - Source: dev.to / 10 months ago

Https://letsenhance.io (For $9 you can get 100 credits to make 100 thumbnails enhanced to HD Quality and you can use the image generators). Source: 12 months ago

Https://letsenhance.io isn’t free but for $9 you can get 100 credits to make 100 thumbnails HD. Source: 12 months ago

Then upscale the image - https://letsenhance.io/. Source: 12 months ago