Better not to use the online form provided by Pinterest.
Pinterest's online form will only allow pin pages, not images, making it extraordinarily useless in the case of medium to large scale cases of infringement. Further, a single error in a multiple submission will wipe the form clear and the entries are not recoverable, forcing you to give up on multiple submissions in favor of individual submissions.
To work around these Pinterest's attemps to discourage you from enforcing your copyrights, you must email them your DMCA request direction. For this, you will need to re-format all image location URLs. If you don't specify every version of every image, they'll be more than happy to leave them on their servers. They are not there you help you; they are there to help themselves keep your content and leave their users as unmolested as possible by your take-down requests.
You will notice that the infringing image URLs are in this format:
Pinterest has many caches ("media-cache1," "media-cache2," "media-cache3,") and some versions dedicated to international traffic. In order to remove images from any of their many servers, you will start by stripping off the beginning of each image URL:
This code will remain for each image:
Right now, your image is stored in 5 different formats. This may change as the site evolves, Pinterest may decide to change the way they name these different format filenames, or add new ones. To delete them all (as they are named to this date), change the letters in the URLs to have a version that ends with a b, a c, an f and a t - in addition to a full-size original without a suffix.
Mail your letter to this address: firstname.lastname@example.org
Below is an example of a formatted letter with the required legal declarations included:
Remove these images from your servers (IMAGE LOCATIONS):
They are from my website (LINK LOCATIONS):
I state UNDER PENALTY OF PERJURY that:
I have a good faith belief that the disputed use of the copyrighted material is not authorized by the copyright owner, its agent, or the law (e.g., as a fair use).
I am the owner, or authorized to act on behalf of the owner, of the copyright or of an exclusive right under the copyright that is allegedly infringed.
This information is accurate.