Instagram
Facebook
TikTok
YouTube
LinkedIn
X
Threads
Pinterest
BlueskyHow each network counts
These are the limits each network publishes, checked on 24 October 2026. Where an app posts for you, the network's API rules apply. The character limits guide explains each one.
| Network | Limit | Good to know |
|---|---|---|
| Caption: 2,200 characters | Up to 5 hashtags and 20 @mentions per post. | |
| Post text: Not published | Facebook doesn't publish a limit for posts. Unisenda's editor allows 5,000 characters. | |
| TikTok | Video caption: 2,200 characters | The limit for captions sent through TikTok's API; most emoji count as 2. |
| YouTube | Title: 100 characters Description: 5,000 bytes | Descriptions are measured in bytes: accented letters and emoji use more than one. No < or > in either field. |
| Post text: 3,000 characters | Most emoji count as 2. For longer pieces, LinkedIn suggests writing an article. | |
| X | Post: 280 characters | Every link counts as 23 and most emoji as 2. X Premium allows up to 25,000. |
| Threads | Post: 500 characters | Through Threads' API, emoji count by their size in bytes. |
| Title: 100 characters Description: 800 characters | Feeds may show only the start of a title, so lead with the point. | |
| Bluesky | Post: 300 characters | Counted as you see it: an emoji is 1. The text is also capped at 3,000 bytes. |
Writing one caption for every network
- Start with the tightest limits, X at 280 and Bluesky at 300, then write longer versions for LinkedIn, Instagram and YouTube.
- Put the point in the first line. Most feeds show only the opening before a "more" link.
- Keep Instagram to 5 hashtags or fewer, the most it now allows on a post.
- In Unisenda, write the shared caption once, then open each account's tab for a version that fits. The same counters run as you type.
Questions people ask
Is my caption saved or sent anywhere?
No. The checker runs in your browser and your text isn't sent to Unisenda. If you choose to open it as a draft in the free demo, it is handed over inside your browser and kept there as a demo draft.
Why is my X count higher than the number of letters?
X counts every link as 23 characters however long it is, and most emoji and Chinese, Japanese or Korean characters as 2. The checker counts the same way.
Why does Facebook show no limit?
Facebook doesn't publish a character limit for posts. Unisenda's own editor allows 5,000 characters, which is plenty for almost any post.
Does the checker count the way Unisenda does?
Yes. It uses the same counting code as Unisenda's composer, where each account also gets its own caption, so a long LinkedIn version and a short X version can go out together.
Sources
Checked on 24 October 2026. Networks change their rules, so check the source before you rely on a number.
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