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Duplicate each line

Repeat every line a chosen number of times.

Related tools

All Transform & clean tools →
Quote each lineWrap every line in quotes, with an optional trailing comma — handy for code arrays.Trim each lineRemove leading and trailing whitespace from every line.Reverse each wordReverse the letters inside each word while keeping the word order.Find duplicate linesShow only the lines that appear more than once in your text.Remove duplicate linesDelete repeated lines while keeping the original order of the first occurrences.Remove duplicate wordsKeep only the first occurrence of each word in your text.Add line numbersPrefix every line of your text with a sequential line number.Remove line breaksStrip or replace line breaks to turn multi-line text into one line.

Open Duplicate each line and you get an answer straight away, with no account to create. Its place is under Transform & clean; Quote each line and Trim each line answer the questions closest to this one.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Duplicate each line?

Repeat every line a chosen number of times.

When would I actually use this?

Cleaning up a paste before it goes anywhere: stripping duplicates from a list, normalising case, removing accents for a filename, or sorting lines.

What is the most common mistake?

Sorting text as if it were ASCII. Accented letters land after Z in a byte sort, which puts "Zurich" before "Émile" and produces a list no reader will accept.

How is Duplicate each line different from Quote each line?

They sit next to each other but answer different questions: Quote each line is the one to open when you need it to wrap every line in quotes, with an optional trailing comma — handy for code arrays. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Trim each line is the closest one after this: Remove leading and trailing whitespace from every line.

What else is worth having open alongside it?

Reverse each word and Find duplicate lines — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Transformations use the browser's Unicode-aware string handling, so case changes and sorting respect the locale rather than byte order. Nothing is truncated: what comes out is the whole of what went in.

Further reading

All guides →
ExplainerFinding Duplicates in a List Without a SpreadsheetTwo lines that look identical are often not identical. Case, a trailing space, a no-break space and two different encodings of the same accented letter were each run through the duplicate finder, and it reported no duplicates for three of the four.How-toCleaning Messy Text: The Order of Operations That Actually MattersStrip tags before decoding entities, trim before deduplicating, collapse whitespace last. Three orderings run in Node, a nine-step pipeline in the right sequence, and the invisible characters — U+00A0, U+200B, U+FEFF — that survive every naive cleanup.How-toNumbering the Lines of a Text for a Review with Several PeopleNumbering starts at 1 and cannot be set to 0, the alignment is spaces rather than zeros, and the remover undoes eight of the eleven separators without touching the indentation. What it still cannot do is tell your numbers from its own.GuideCleaning Up a List Pasted from a Spreadsheet or a PDFA paste carries characters you cannot see: no-break spaces, soft hyphens, zero-width spaces, tabs and CRLF. Four cleanup tools were run against each of them, and they use three different definitions of whitespace.GuideStripping Markdown: What Plain Text Loses, and What a Regex Gets WrongA link becomes text with its destination deleted, a nested list loses its hierarchy, a table becomes a row of words. Then the technical half: markdown has no single spec, and a regex stripper mangles a filename, a multiplication sign and the inside of a code block — all shown against a real parser.GuideFind and Replace: The Regex Features That Bite, Demonstrated One by OneGreedy against lazy on the same string, the dot that skips newlines, $& and $$ in the replacement, a reused /g regex that silently skips a row, and why /i knows nothing about Turkish i. Every failure run in Node, with a count-then-replace routine that catches them.