These platforms offer legitimately free footage, often under the Pexels or Pixabay licenses (no attribution required):

Some unofficial tools claim to provide high-definition, watermark-free videos for free. Using these tools to access premium content without payment is a direct violation of iStock’s Terms of Use and can lead to copyright infringement claims. Legal and Safe Ways to Download iStock Videos

An iStock video downloader is typically a web-based service or software designed to extract video files from an iStock URL. These tools generally fall into two categories:

An "iStock video downloader" is a trap. You risk your computer’s security, your legal safety, and your professional reputation—all for a low-res, watermarked clip that looks unprofessional anyway.

Why not just stream the video to check if it works?

If a website or software promises to let you download premium iStock videos for free, it is either: