Underline Text Generator

Most places you type online offer no underline button: social media posts and bios, usernames, chat messages, video titles, and plain-text fields strip formatting entirely. Yet underlined text still appears there — because it is not formatting at all. This free generator attaches Unicode combining characters to each letter of your text, producing underline, double underline, strikethrough, or overline effects that are part of the text itself. The result copies and pastes like ordinary characters and keeps its styling wherever Unicode is rendered. Generation is instant and runs entirely in your browser.

Unicode includes combining diacritical marks — characters that render attached to the character before them instead of occupying their own space. The generator inserts the combining low line (U+0332) after every character for underlining, the double low line (U+0333) for a double rule, the long stroke overlay (U+0336) for strikethrough, and the overline (U+0305) for a line above. Because the marks travel with the letters, the styling survives copy-paste into any field that accepts plain text — no HTML, no rich-text editor required.

Underlined and struck-through Unicode displays correctly across modern platforms: Instagram bios and captions, X posts and display names, Facebook, TikTok, YouTube titles and descriptions, Discord, WhatsApp, and Telegram messages, and most forum and comment systems. Support ultimately depends on the fonts of the viewing device, so the effect is near-universal on current phones and browsers but can degrade on very old systems. When a platform cannot render a mark, the letters themselves remain readable — the styling fails gracefully rather than producing garbage.

Each style carries its own signal. Underline adds emphasis and mimics links or headings where real formatting is unavailable. Double underline pushes the emphasis further, useful for single key words rather than whole sentences. Strikethrough communicates correction, cancellation, or irony — crossed-out prices, retracted statements, jokes told through visible deletion. Overline is the rarest and most decorative, lending a technical or stylized look to names and titles. All four are generated the same way and can be mixed across a longer text by styling fragments separately.

By default every character, including spaces, receives the combining mark, producing one continuous line under the whole phrase. Enable Don't underline spaces and the marks attach only to visible characters, breaking the line between words. Continuous underlining reads as a single underlined phrase; per-word underlining looks lighter and survives better in renderers that draw combining marks on spaces inconsistently. Try both — the better choice depends on the destination platform's fonts.

Combining characters have real costs worth knowing. Screen readers may announce the marks or stumble over them, so avoid styled text in contexts where accessibility matters more than decoration, and never style critical information that must be machine-readable, like codes or addresses. Each mark also counts toward character limits, roughly doubling the length of styled text in limited fields. Search within a page or app will not match styled text against its plain spelling. Use the effect for emphasis and flair, not for content that must be found, parsed, or read aloud.

The generator runs locally in your browser with JavaScript; the text you style is never uploaded, stored, or logged. The output statistics show the character count including combining marks — useful for checking against platform limits — and everything is cleared from memory when you close the page.