Text Tools

Prefix Lines Guide

Learn when to use Prefix Lines, how to use it correctly, and how to avoid common mistakes.

What this guide covers

Use this prefix lines tool to add the same prefix to each line of text. It is useful for comments, bullets, code formatting, labels, and list preparation.

This guide explains when to use Prefix Lines, how to get a cleaner result, and which mistakes to avoid before moving on to related tools or the main tool page.

Why use Prefix Lines

Adds the same prefix to every line quickly.
Useful for comments, bullets, labels, and code snippets.
Helps transform lists without manual editing.
Fast for browser-based line formatting.

How to use Prefix Lines

Enter the prefix on the first line.
Leave a blank line.
Paste the multi-line text below.
Run the tool and review the prefixed result.

Best use cases

Adding comment markers to code lines.
Turning plain lines into bullets.
Adding labels or markers to each row.
Formatting exports or copied lists.

Common mistakes

Forgetting the blank line between prefix and text.

Fix: Put the prefix first, then a blank line, then the body text.

Expecting empty lines to be skipped.

Fix: This tool prefixes every line, including empty ones.

Using a very long prefix.

Fix: Use a short consistent prefix for cleaner results.

Use the tool

Ready to run Prefix Lines? Open the main tool page to enter your input, generate the result, and copy or download the output.

Open Prefix Lines