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Limits are the public defaults at the time of writing; platforms change them. Everything is calculated in your browser; nothing you type is uploaded.

X uses weighted counting: links count 23, emoji and CJK characters count 2. Bluesky and Threads count graphemes. SMS parts use GSM-7 (160/153) or Unicode (70/67).

A 141-character post with a link and an emoji counts 145 on X and fits every platform.