Extract every #hashtag from your caption, count duplicates, and check against per-platform limits like Instagram's 30-tag cap and LinkedIn's 5-tag best practice.
Instagram allows up to 30 hashtags per post, but research consistently shows 3–5 highly relevant tags outperform a wall of 30 generic ones. Quality of relevance beats quantity.
Three to five. LinkedIn's algorithm rewards focused topical relevance, and posts with too many hashtags often get flagged as low-quality. One to two niche tags often outperforms five broad ones.
Sparingly. Tweets with 1–2 hashtags get higher engagement than tweets with 3+. Power users often skip them entirely now that the algorithm relies more heavily on text and links.
Letters (any language), digits, and underscores. Spaces, punctuation, and emoji break the tag. The # symbol must be followed immediately by a letter — "#1" is not a clickable tag on most platforms.