The X (Twitter) bio limit
An X bio can be up to 160 characters. It shows on your profile and in the hover card when someone sees your name, so it is how a stranger decides whether to follow you after your launch post.
How to write a X (Twitter) bio
Say what you build and what you post about. Mentioning your product's handle turns profile visits into product visits; the website field is separate, so you do not need a link in the bio.
Questions
What is the X (Twitter) bio character limit?
160 characters. The website link has its own field.
Does a link in the X bio count toward 160?
Yes, but X has a separate website field on the profile, so most founders keep the bio for text and handles.
Can I use line breaks in an X bio?
Yes, line breaks are allowed and count as characters.
Do spaces and emoji count?
Spaces and punctuation count as one character each. This checker counts each visible character once, so an emoji counts as one.
Is my text stored or sent anywhere?
No. The counting happens in your browser and nothing is uploaded.