Paste a caption to see how it measures up on X, Instagram, TikTok, YouTube, LinkedIn, Facebook and Pinterest, counted the way each network counts.
| Where | Used / limit | Status |
|---|---|---|
| X postNetwork documentation | 0 / 280 weighted characters | Fits |
| Instagram captionNetwork documentation | 0 / 2,200 characters | Fits |
| TikTok captionNetwork documentation | 0 / 2,200 UTF-16 units | Fits |
| YouTube title (first line)Network documentation | 0 / 100 characters | Fits |
| YouTube descriptionNetwork documentation | 0 / 5,000 bytes | Fits |
| LinkedIn postPostRoost composer limit | 0 / 3,000 UTF-16 units | Fits |
| Facebook postPostRoost composer limit | 0 / 63,206 UTF-16 units | Fits |
| Pinterest title (first line)PostRoost composer limit | 0 / 100 UTF-16 units | Fits |
| Pinterest description (after the first line)PostRoost composer limit | 0 / 500 UTF-16 units | Fits |
| Network | Limit | How the counter counts |
|---|---|---|
| X | 280 | X’s weighted count: text is normalised (NFC); every link counts 23; each emoji counts 2; characters in the ranges U+0000–U+10FF, U+2000–U+200D, U+2010–U+201F and U+2032–U+2037 count 1; everything else (for example Chinese, Japanese and Korean characters) counts 2. |
| 2,200 | Unicode characters. Also warns above 30 hashtags or 20 @ tags. | |
| TikTok | 2,200 | UTF-16 code units (“runes” in TikTok’s documentation): most emoji count 2. |
| YouTube title | 100 | Characters of the first line, as PostRoost uses the first line as the title. |
| YouTube description | 5,000 | Bytes in UTF-8: letters with accents count 2, most emoji 4. Also warns about < and >, which YouTube does not allow. |
| 3,000 | UTF-16 code units. | |
| 63,206 | UTF-16 code units. | |
| Pinterest title / description | 100 / 500 | First line, then the rest, as PostRoost publishes them. |
Where the limits come from. X, Instagram, TikTok and YouTube publish their limits in their developer documentation (see sources below). For LinkedIn, Facebook and Pinterest we could not find a current official reference, so the counter shows the limits PostRoost’s own composer enforces, labelled “PostRoost composer limit”.
About links on X. The counter recognises addresses that start with http://, https:// or www., and bare domains with common endings such as .com, .org, .io or .co.uk. X’s own link detection recognises more endings, so an unusual domain may be counted character by character here.
Characters as you see them. The summary line counts grapheme clusters, so a family emoji or a flag counts as one, which is what a reader sees. Networks count differently, which is why the table matters.
Nothing you type leaves your browser.
Facts on this page were checked against the sources below on . Networks change their limits; we re-check these sources whenever we update the tool.
10 questions
X weights characters: every link counts 23, each emoji counts 2, and many non-Latin characters count 2. The counter applies the same rules.
X shortens every link to a fixed length, so any link counts as 23 characters however long it is.
Networks measure text in different units: X weights emoji as 2, TikTok counts UTF-16 units, and YouTube descriptions count bytes, where most emoji are 4.
Instagram allows 30 hashtags and 20 @ tags per caption. The counter warns when you go over either.
The counter takes the first line as the title, because that is how PostRoost publishes it, and checks it against YouTube's 100 characters. The description limit is 5,000 bytes.
YouTube's limit is 5,000 bytes, not characters. Letters with accents take 2 bytes and most emoji 4, so a description can hit the limit before 5,000 characters.
We found no current official reference for them, so the counter shows the limits PostRoost's composer enforces, labelled as such.
It recognises addresses starting with http://, https:// or www., and bare domains with common endings. X recognises more endings, so an unusual domain may be counted letter by letter here.
It counts characters as a reader sees them, so a flag or family emoji counts as one. The per-network rows show how each network counts.
No. Counting happens in your browser and nothing you paste leaves it.
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