Short answer: usually yes for personal use, but Pinterest is more ethically layered than a video site. The long answer is worth reading.
The legal framework is the same as any other downloader. In the United States, fair use under 17 U.S.C. § 107 generally permits personal, non-commercial copies of copyrighted material for purposes like study, criticism, research, and personal reference. Most of the Commonwealth has an analogous doctrine called fair dealing. Saving a pin to a private reference folder on your laptop falls well inside that zone.
Pinterest is uniquely complicated, though, because most pins are not owned by the person who pinned them. Pinterest is a reshare-first platform. When someone pins a wedding photograph, odds are the photographer never touched Pinterest at all — a stranger found the image on the photographer's website or blog and pinned it. That stranger is not the copyright holder. They are just the person who moved the image onto Pinterest's servers.
This is why every Pinterest pin has a small original sourcelink under it. Pinterest actively surfaces the URL the image was scraped from, as a partial attribution mechanism. Before you download a pin you plan to use for anything beyond personal reference, follow that link. If it goes to a real person's portfolio or a brand's product page, that is the actual rights holder — and the only person who can grant you a commercial licence. Pinterest's own Creator Code guidelines formalise this attribution norm.
The rough cut between safe and risky looks like this. Downloading pins for a private mood board on your own machine, for research, for inspiration, or for a pitch meeting where you clearly label the references — fair use territory. Downloading pins and re-uploading them to your own commercial website, selling them in a print set, or bundling them into a paid ebook — copyright infringement, regardless of whether the original got to Pinterest in the first place with permission. Somewhere in the middle sits the kind of use designers have always made of clipped magazine pages: private reference, inspiration, homage. Courts tend to tolerate that when the final product is transformative.
For images that are explicitly licensed for reuse, the picture is clearer. The Creative Commons licence family covers millions of images with varying levels of permission — CC0 (public domain) through CC BY (attribution required) through CC BY-NC-SA (non-commercial, with attribution, shared alike). Pinterest does not consistently surface licence information, so when it matters, trace the pin back to the original source and check the licence there.
This is general information, not legal advice. For specific commercial use cases, talk to an actual intellectual-property lawyer in your jurisdiction.