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Underline text

Apply combining underline marks to emphasize individual characters in your text.

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Underline text
Add underline marks beneath every character in your text using combining Unicode underline characters. This tool uses the Unicode combining low line (U+0332) and combining double low line (U+0333) to create styled text that works across all devices and platforms. The underlines stay attached to each letter as the text moves through emails, documents and messaging apps.
Choose between single and double underlines to fit your emphasis needs. The tool automatically skips spaces and line breaks, so your text layout remains readable while the important characters stand out. Perfect for highlighting keywords, creating eye-catching headings, or adding visual emphasis to important information without changing the actual characters.
The output text is compatible with social media, messaging platforms, and word processors. Since the text uses standard Unicode combining marks, it will display correctly wherever Unicode text is supported. Copy the result and paste it anywhere text is accepted — the formatting travels with it. The live tally shows exactly how many characters received the underline treatment, helping you see at a glance how much of your text has been styled.
Everything runs locally in your browser, so your text stays private and never leaves your device. No servers are involved and no data is collected.
FAQ
What is the difference between single and double underline?
Single underline uses a basic combining low line beneath each character, while double underline uses a thicker double-line mark. Both use Unicode combining characters that stay attached to the text.
Will this work in all applications?
The underlined text will display correctly in any application that supports Unicode text, including email clients, word processors, social media and messaging apps. If an app doesn't display it correctly, it lacks proper Unicode support.
Are spaces and line breaks underlined?
No. The tool automatically skips spaces, tabs and line breaks, underlining only visible characters. This keeps your text layout clean and readable.
Is my text uploaded anywhere?
No. The tool runs entirely in your browser and your text never leaves your device.