What does this tool do?
Line Number Adder places a sequential number at the start of each line in your text. It is handy for adding reference numbers to code snippets, lists or documents where you need to point to specific lines while debugging. It is practical for developers, teachers and anyone editing long passages of text.
How to use it
- Paste your text into the input area.
- Adjust the options to fit your needs.
- Copy the processed text.
What are numbered lines good for?
When reviewing code or discussing a document, it is far easier to communicate with phrases like "the bug on line 7." This tool puts an increasing number in front of every line, making your text easy to reference. It is ideal for numbering steps in instructional material, reviewing log files, or quickly seeing how many lines a piece of text contains. Numbering is applied instantly, and you can copy the result and paste it wherever you need.
Frequently asked questions
What number does the numbering start from?
Numbers usually start at 1 and increase by one on each line, so the final number equals the total line count of your text.
Are blank lines numbered too?
Yes, every line in the text receives a number even if it is empty, because the line order is preserved. This matters when you need to reference actual line positions.
Is Line Number Adder free?
Yes. Line Number Adder and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. Line Number Adder works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.