It depends on the platform. Instagram limits posts and Reels to 5 hashtags total (combining your caption and first comment), so make each one count. X (Twitter) has no hard limit, but its own guidance recommends no more than 2 hashtags per post — more tends to reduce engagement. TikTok allows up to 30 hashtags, but 3-5 focused ones usually perform best, and every hashtag counts toward your caption's character limit. On Facebook there's no official limit either, but 1-3 relevant hashtags is the sweet spot — anything more can look spammy.
A valid hashtag starts with a single # followed only by letters, numbers, or underscores — no spaces or punctuation. Hashtag Counter automatically flags duplicates, malformed tags (like ## or #tag!), and repeated hashtags as you type.
Yes — Hashtag Counter is completely free, works directly in your browser, and doesn't require an account, sign-up, or download.
Nothing is saved unless you choose to. If you click "Save" and grant permission, your hashtag lists are stored locally in your own browser (localStorage) — never on our servers — and you can clear them at any time.
A hashtag counter (sometimes called a hashtag calculator) counts how many hashtags are in your post, flags invalid or duplicate tags, and helps you stay within each platform's hashtag limits so your posts don't get flagged as spam or lose reach.