Pinterest caps hashtags at 20 per Pin and quietly suppresses anything beyond that, while duplicates and malformed tags waste your budget and look spammy. This tool counts your tags against the limit, flags the problems, and hands back a clean, normalised string ready to paste.
How it works
The tool splits your input on spaces, commas, and new lines, normalises each token to a single lowercase hashtag, and then audits the set:
count = number of valid, unique hashtags
over limit = count > 20
duplicate = same tag (case-insensitive) appears twice
malformed = empty, contains spaces, or has no word characters
char cost = total characters the hashtags add to the 500-char description
Because Pinterest matches tags case-insensitively, HomeDecor and homedecor
collapse to one tag — counted once and flagged as a duplicate if both appear.
Tips and notes
The 20-tag ceiling is a hard limit, but Pinterest’s own guidance is to use only a focused handful of highly relevant tags; a packed list dilutes relevance and can reduce distribution. Remember the tags share the 500-character description budget, so keep them short. Use the cleaned output to drop duplicates and place your two to five strongest tags at the end of an otherwise keyword-rich description.