Here is the honest part first: on Pinterest, hashtags matter far less than keywords. Pinterest search relies mostly on the words in your pin title, description, board name and the page your pin links to. Hashtags are optional, and a long block of them makes a description harder to read.
If you still like to add a few, this generator helps you choose relevant ones instead of generic filler. Type a topic and it suggests tags from a hand-picked list for that niche, plus combinations built from your own keyword. Tap to select or remove tags, then copy the set and paste it at the end of your description.
Do hashtags work on Pinterest?
They can help a little, but they are not how most pins get found. A pin with a clear keyword title and a helpful description will do better than the same pin with twenty hashtags and a vague title. Treat hashtags as a small extra, never a replacement for keywords.
Spend your time on the parts that carry more weight: the pin title, the description and a board name people actually search.
How to choose good Pinterest hashtags
Choose tags that describe the pin specifically. #fallcapsulewardrobe tells a reader more than #fashion. Mix one or two broad tags with a couple of specific ones, and skip tags that only describe your brand unless people already search for it.
Keep the set short. A few relevant hashtags at the end of a description look natural. A long list looks like spam to people reading it.