Add Line Numbers
Prefix every line of pasted text with a sequential number.
Numbered lines for reference and review
When you are pointing a teammate at a specific line of a log, a transcript, or a block of config, "the fifth line" is faster than pasting a screenshot. This tool adds a sequential number to the start of every line so each one has a stable reference you can cite in a comment or ticket.
It renumbers from the top every time, so you can paste, edit, and re-run without hand-counting. Blank lines are numbered too, which keeps the count aligned with the original so line 40 here is line 40 there.
When to use it and privacy
It is meant for plain text and logs, not source files that already have editor line numbers — pasting numbered output back into code would break it. Everything runs locally in the browser, so pasted logs or transcripts are never sent to a server.
Frequently Asked Questions
Does it number blank lines?
Yes. Every line including empty ones gets a number, so the count stays aligned with your original text.
Can I use this for code?
You can, but the numbers become part of the text — do not paste the numbered output back into a source file. It is best for logs, transcripts, and references.
Is my text uploaded?
No. Numbering happens in your browser and the pasted text is never sent anywhere.
Explore more tools for writing, cleanup, and practical content workflows.