APITemplate.io vs ReSmush.it

APITemplate.io lets teams design reusable HTML or drag-and-drop templates in a browser editor, then render them into images or PDFs on demand through a REST call, Zapier, Make, or n8n. Requests send JSON overrides for named text, image, and color elements (with Jinja2 available for PDF templating) and get back a hosted download URL for the generated PNG or PDF. A free plan covers 50 image/PDF renders and 3 templates a month, with paid PDF and image plans scaling to tens of thousands of documents.

ReSmush.it is a free, keyless image-optimization API — best known as the backend behind the ReSmush.it WordPress plugin — that accepts a source image URL and returns a JSON payload with the compressed image's URL plus original size, compressed size, and percent reduction. A live call against api.resmush.it needed no credentials and returned Access-Control-Allow-Origin: *, so it works directly from browser JavaScript. The plain http:// endpoint immediately redirects to https, so the service is https-only despite requiring no API key.