If you absolutely must use PDFCoffee to find a document, follow these "best practices" to minimize your risk:

PdfCoffee is a free service, which means they monetize through ads. The safety issues usually stem from the quality of these ads:

A Virtual Private Network masks your IP address, adding a layer of anonymity between you and the site (and its advertisers).

PDFCoffee often asks users to register or sign in to access certain features.

Ensure your real-time protection is turned on. After downloading a file, right-click it and scan it with your antivirus before opening it.

The short answer is: While PdfCoffee is a legitimate website that works, it is generally considered less safe and more cluttered than top-tier competitors like Adobe or Smallpdf.

PdfCoffee works, but it is a "wild west" website. If you have an ad blocker and are converting non-sensitive files, it is generally safe. If you are on a work computer or handling private data, avoid it.

Most of the content on PDFCoffee is uploaded without the permission of the original author or publisher.

If you must use PDFCoffee, click on pop-ups and always run any downloaded file through a scanner like VirusTotal before opening it.