How the lines are made
Each style adds a combining mark after every character. A combining mark is a Unicode character that draws on top of the one before it, the same way an accent sits on é. Strikethrough uses U+0336 (a long stroke), underline uses U+0332 (a low line) and overline uses U+0305.
The mark goes after spaces too, so the line runs unbroken across the whole phrase instead of stopping between words.
Good uses for strikethrough
A line through text says “this changed” at a glance:
- An old price next to a new one in a sale post.
- A joke self-edit, like “I'm o̶b̶s̶e̶s̶s̶e̶d̶ mildly interested”.
- Ticking off a list in a story or a pinned post.
- Showing a correction openly instead of deleting it.
Things to watch out for
Every character gets an extra mark, so lined text uses about twice as many characters. That matters for limits like Instagram's 150-character bio or a 280-character post on X.
How neat the line looks depends on the font of the app you paste into. On most phones it's a clean line; in some fonts it can look broken or sit a little high. Screen readers usually ignore the marks or read them out one by one, so the meaning of a crossed-out word can get lost.
Apps with built-in strikethrough
Some apps have their own: in WhatsApp and Slack, put tildes around a word (~text~). In Discord and Reddit, use two tildes (~~text~~), and in Discord two underscores (__text__) underline. Built-in formatting is easier for screen readers, so use it where it's available.
Frequently asked questions
How do I cross out text on Instagram?
Instagram has no strikethrough option. Type your text here, copy the strikethrough version and paste it into your caption, bio or comment.
How do I underline text in a bio or caption?
Pick the Underline style here and paste it in. The line is a character under each letter, so it works where there's no underline button.
Why is my strikethrough text over the character limit?
Each letter carries an extra invisible mark, so lined text counts as roughly double. Shorten the text or only strike out the words that need it.
Does strikethrough work on LinkedIn and Facebook?
Yes. Both keep combining marks, so pasted strikethrough text shows crossed out in posts and comments.
How do I do strikethrough in WhatsApp?
Put a tilde on each side of the text, like ~this~. WhatsApp shows it crossed out without needing this tool.