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Prefix Adder

Add the same prefix to the beginning of every line, with a live preview and one click copy.

Add a prefix to every line

Type or paste text to add a prefix.
The prefix is added locally in your browser and nothing is uploaded.

How to use the Prefix Adder

  1. Paste the lines you want to change.
  2. Type the prefix to add at the start of every line.
  3. Check the live preview and copy the prefixed text.

Features

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Frequently Asked Questions

Common questions about the free online prefix adder.

Paste your text, type the prefix you want, and the preview adds it to the beginning of every line straight away.
This tool adds the same prefix to every line. For running numbers or varied markers you would need a script instead.
Yes. Keep Skip empty lines ticked and lines that contain only spaces are left untouched instead of gaining a prefix.
Yes. Any characters work, including dashes, stars, brackets and numbers such as 1. followed by a space.
No. Your original text stays in the input box and only the preview and the copy button use the prefixed version.
Yes. Click the Copy button and the whole prefixed text is placed on your clipboard in one go.
Yes. Prefixes and lines are plain text, so accented letters and other scripts pass through the tool unchanged.
No. The prefix is added locally in your browser, so nothing you paste is ever sent anywhere.

Last updated: October 10, 2026