Add Prefix/Suffix to Lines

About the Add Prefix/Suffix to Lines Tool

We built this tool to be a simple but essential utility for anyone who works with lists of text. It's a common task for developers, data analysts, and researchers to need to add the same piece of text to the beginning (a prefix) or end (a suffix) of many lines at once. Doing this manually is slow and prone to errors. Our tool automates this process instantly.

You can add a prefix, a suffix, or both at the same time. We've also included helpful options to ignore empty lines or to trim extra whitespace from each line before adding the text. This ensures your final list is clean and correctly formatted. Like all our tools, this runs entirely in your browser, so your data is always private and the tool is incredibly fast.

How to Use the Tool

• Paste your list of text into the "Input Lines" editor on the left.
• Enter the text you want to add in the "Add Prefix" and/or "Add Suffix" fields.
• The "Modified Output" on the right will update in real-time as you type.
• Use the "Options" to control how the tool handles empty lines and extra spaces.
• Once you're happy with the result, use the "Copy" or "Download" buttons to save your new list.

Frequently Asked Questions

What is a prefix and a suffix?

A prefix is a piece of text that is added to the beginning of a string or line. A suffix is text that is added to the end. For example, if your line is "item", and you add the prefix "start_" and the suffix "_end", the result will be "start_item_end".

What is a common use case for this tool?

A very common use for developers is to build a list of full URLs. You might have a list of page slugs (e.g., "about-us", "contact"), and you can use this tool to quickly add the domain prefix (`https://www.example.com/`) to every line.

How does the "Ignore empty lines" option work?

When this option is checked, the tool will not add the prefix or suffix to any line that is completely empty or contains only whitespace. This is useful for preventing accidental modification of blank lines that you want to keep for spacing.

What does "Trim whitespace from each line" do?

This option removes any accidental spaces or tabs from the beginning and end of each line before adding the prefix and suffix. This ensures your final text is clean and uniformly formatted, without unwanted extra spaces.

Is my data private?

Yes. All text processing happens directly in your web browser on your computer. Your text is never sent to our servers, so you can safely use this tool with sensitive data.