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Slickr - Powerful cover image generator for your Hashnode blog
Screenshot Machine - Screenshot machine is an online website capturing service. Creates a screenshot or thumbnail of any online web page in couple of seconds for free.
Canva Pro - Millions of design assets, templates and images all in one
HTMLCSS to Image API - Convert HTML to an image (jpg, png, webp). Renders images exactly like Google Chrome. Works with PHP, JavaScript, Ruby, .NET and more.
SocialSizes - Sketch templates for sharing images & videos on social media