PDFCrowd might be a bit more popular than 3D Object Converter. We know about 1 link to it since March 2021 and only 1 link to 3D Object Converter. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Waaaaaaaaaay back in the day I used to use 3D Object Converter. It appears to still get updates and still support OOF. Source: over 1 year ago
To follow on with this, I've used https://pdfcrowd.com/ too. Source: about 3 years ago
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