The X (Twitter) post limit
A standard X post can be up to 280 characters; Premium subscribers can post longer. X does not count every character the same way: any link counts as 23 characters however long it is, and many emoji and Chinese, Japanese and Korean characters count as two.
How to write a X (Twitter) post
Front-load the hook, because long posts collapse behind "Show more" in the timeline. Put the link at the end, and if you are close to the limit remember the link costs 23 characters even when it is short.
Questions
What is the X (Twitter) post character limit?
280 characters. This checker counts links as 23 and wide characters as 2, the way X does.
Why does a short link still count as 23 characters on X?
X wraps every link in its own shortener, so each one counts as 23 characters regardless of its real length.
Do emoji count as two characters on X?
Most emoji count as two, which is why a post full of emoji runs out of room sooner than you expect.
Do spaces and emoji count?
Spaces count as one character. X counts most emoji and Chinese, Japanese and Korean characters as two, and every link as 23; this checker does the same.
Is my text stored or sent anywhere?
No. The counting happens in your browser and nothing is uploaded.