Online Tool Store
Hashtag Counter
Count the hashtags that actually work in a caption, catch tags broken by punctuation and case-insensitive duplicates, and check platform limits.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example shown — it deliberately contains a duplicate and a broken tag.
Working hashtags
—
The tags found
Limits and conventions change, and platforms rarely document them precisely — treat the numbers here as current practice rather than guarantees, and the "recommended" counts as convention rather than rules. What this can check exactly is your own text: how many tags actually work, which are duplicated, and whether you are over a character limit.
How to use it
- Paste your caption with its tags.
- Choose the platform you are posting to.
- Read the warnings — broken tags and duplicates are the common surprises.
- Strip the duplicates, then copy the clean tag list.
Counting hashes is not counting hashtags
A hashtag is not "everything after the hash". It runs until the first character that cannot be part of one, and only letters, digits and underscores qualify. So a hyphen, a full stop or an apostrophe silently cuts a tag in half:
#photography → #photography works
#not-a-tag → #not cut at the hyphen
#wild.atlantic → #wild cut at the stop
#2024 → not a tag digits only
The all-digit case catches people out most: a year or a number looks like a perfectly good tag and does nothing on most platforms. Both problems are invisible when you are typing, and both are certain — they are parsing rules, not algorithmic guesswork — so the tool flags them individually rather than just reporting a count.
Duplicates cost you a slot
Platforms treat tags case-insensitively, so #Travel and
#travel are the same tag. Using both does not reach two audiences; it
uses one of your thirty twice. It happens easily when tags are pasted from more than one saved block, and nothing in the
posting interface will tell you. The tool matches case-insensitively for exactly this reason, and will strip the repeats
out of your caption in place.
Emoji and the character limit
what a reader counts code points
what a limit counts UTF-16 units
a plain letter 1 unit
🌅 2 units
a flag or skin-tone emoji 4 or more
A caption full of emoji can be well over a limit while looking comfortably short, which is why both counts are shown. On X's 280 the difference is material; on Instagram's 2,200 it rarely is, but the hashtag cap bites long before the characters do.
What is a rule and what is a habit
Instagram's 30 tags and YouTube's 15 are limits — exceed YouTube's and it discards all your tags rather than the extras, which is a genuinely punishing failure mode. Almost everything else is convention: two on X, three to five on LinkedIn, one or two on Facebook. Those are worth knowing and worth ignoring when you have a reason.
What this tool deliberately does not do is claim that a particular number of tags gets you more reach. Nobody outside the platforms can measure that, and the advice changes every year. It checks what is checkable: how many of your tags work, which are wasted, and whether you fit.
FAQ
Why is my tag count lower than the number of hashes I typed?
Because not every hash makes a working tag. A hashtag ends at the first character that cannot be part of one — letters, digits and underscores are allowed, and everything else terminates it — so "#not-a-tag" tags only "#not". An all-numeric tag like #2024 is not treated as a tag at all on most platforms. Both are counted separately here so you can see where the difference comes from.
Do duplicates count against the limit?
Yes, and case makes no difference to a platform, so #Travel and #travel are one tag used twice. That silently wastes a slot, which matters most on Instagram where 30 is a hard cap. The tool lists the repeats and can strip them from the caption for you.
How many hashtags should I actually use?
Convention rather than rule, and it varies enormously by platform: one or two on X, three to five on LinkedIn, more on Instagram and TikTok where discovery leans on them. The only hard number worth knowing is YouTube's — over 15 tags and it ignores all of them, which is a rule rather than advice.
Why does my caption exceed the limit when it looks short?
Emoji. Character limits are counted in UTF-16 units, and an emoji costs two of them — more if it is a composed one with a skin tone or a flag. The tool shows both figures, characters as a reader sees them and units as the platform counts them, so the gap is visible before you hit paste.
Are these limits guaranteed?
No, and no tool can guarantee them. Platforms change limits without notice and rarely document them precisely, so treat the numbers as current practice. What the tool can check exactly is your own text — the tag count, the duplicates, the broken tags and the character count are all facts about what you typed.
Should the tags go in the caption or the first comment?
On Instagram either works for discovery, and the limits are counted separately, so moving a block of tags into a comment frees caption space. That is a presentation choice rather than a ranking trick — treat claims that one performs better than the other with scepticism, since nobody outside the platform can verify them.
How we compare
| Feature | Online Tool Store | Other hashtag counters | The posting app itself |
|---|---|---|---|
| Counts working tags, not hashes | ✓ | ✗ | ✗ |
| Flags tags broken by punctuation | ✓ | ✗ | ✗ |
| Case-insensitive duplicate detection | ✓ | Sometimes exact-match | ✗ |
| Characters and UTF-16 units both shown | ✓ | ✗ | Units only |
| Nothing typed is uploaded | ✓ | Varies | ✗ |
| Suggests tags or reports their popularity | ✗ | ✓ | Partly |
| Guaranteed current limits | ✗ | ✗ | ✓ |
Catches the two things that silently cost you tags — punctuation cutting them short and duplicates eating slots — before you post. It cannot tell you which tags are worth using, and it does not pretend to; for popularity data you need a platform with real search figures behind it.