Comma Separator

Turn any list into a comma separated list — separators auto-detected, with quotes, de-duplication and one-click copy.

🔒 Runs entirely in your browser — nothing you type is uploaded or stored on a server.

The Comma Separator turns any list into a clean comma separated list the moment you paste it. It auto-detects how your list is separated — one item per line, commas, semicolons, tabs from a spreadsheet, or plain spaces — and joins the items with the separator you choose: comma, semicolon, pipe, tab, new lines or any custom text. The result updates live as you type, ready to copy with one click.

Also on Txtset: create a structured CSV spreadsheet file.

Converting lists between formats is one of those small jobs that eats time all day long. Spreadsheets hand you a column, but SQL IN (...) clauses, code arrays, tag fields and email To-lines all want a single delimited line — usually quoted. Pick single quotes and a pasted spreadsheet column becomes a ready-to-run 'a', 'b', 'c' list for SQL; pick double quotes for a JSON-style array — wrap that in brackets and the JSON Formatter will tell you whether it is valid. Quote characters inside items are escaped automatically (O'Brien becomes 'O''Brien'), so the output is safe to use as-is.

The separator also works in reverse: set the output to “New line” and a comma-crammed sentence unfolds into a tidy column you can sort or count. Along the way you can trim whitespace, drop empty entries and remove duplicates. Everything happens locally in your browser — nothing you paste is uploaded — which makes it safe for customer IDs, email lists and other data you'd rather keep private. Need a proper CSV file with a header row and columns instead of a single delimited line? Use the companion List to CSV Converter.

How to use

  1. Paste your list — the input separator is detected automatically, and you can override it with the dropdown if needed.
  2. Choose an output separator: comma, semicolon, pipe, tab, new line, or type your own custom one.
  3. Optionally wrap every item in double or single quotes — quotes inside items are escaped for you.
  4. Use the checkboxes to trim whitespace, remove empty items and delete duplicates.
  5. Click “Copy result”, or “Download .txt” to save the separated list as a file.

Examples

SQL IN clause
A spreadsheet column of 40 customer IDs becomes '1001', '1002', '1003'… — paste it straight into WHERE id IN (…). Apostrophes in names are doubled automatically, so the query still runs.
Code array
A list of tags converts to "news", "sports", "tech" with double quotes, ready for a JSON or JavaScript array.
Unpacking a list
Set the output separator to “New line” and “apples, pears, plums, cherries” splits into four lines you can sort alphabetically or count.
Email To-line
Paste a column of email addresses and it becomes a comma separated line you can drop straight into an email's To, Cc or Bcc field.

Frequently asked questions

Is this the same as a comma delimiter tool?
Yes — comma separator, comma delimiter and comma separated list generator are different names for the same job: joining list items with commas (or another separator). This tool does all of it, in both directions.
What's the difference between this and the List to CSV Converter?
The Comma Separator produces one delimited line of text — perfect for SQL IN clauses, code arrays and email fields. The List to CSV Converter builds a spreadsheet-ready .csv file, with a header row, multiple columns and standard CSV quoting.
How does the separator auto-detect work?
If your input spans several lines, each line is treated as one item. Otherwise the tool counts the tabs, semicolons and commas in your text and splits on the most frequent one; failing that, it falls back to spaces. If it ever guesses wrong, pick the separator yourself from the Input separator dropdown.
Can I get quotes around each item?
Yes. Choose single quotes for SQL-style lists or double quotes for JSON-style arrays. Quote characters that appear inside an item are escaped by doubling them — 'O''Brien' — which is exactly what SQL and CSV parsers expect.
How do I split a comma separated list back into lines?
Leave the input separator on Auto-detect (or set it to Comma) and choose “New line” as the output separator. Each item lands on its own line.
Can I use my own separator?
Yes — choose “Custom…” as the output separator and type anything you like, such as “ - ” or “ / ”. The custom text is used exactly as typed, so the “Space after separator” option doesn't apply to it.
What does “Remove duplicates” do?
Each exact item is kept only once, in its original order. Combine it with the Sort Lines tool if you also want the list alphabetized before converting.
Is my list uploaded anywhere?
No. Detection, conversion and even the file download all happen inside your browser — safe for internal IDs, customer data and anything else sensitive.

Related tools

List to CSVTurn a plain list into a downloadable, spreadsheet-ready CSV file — or turn a CSV back into a plain list.CSV to JSONTurn CSV data into clean JSON — or JSON back into CSV — with proper handling of quotes, headers and data types.Sort LinesAlphabetize, reverse, shuffle, de-duplicate and clean any list — one line at a time.Email & URL ExtractorPull every email address, URL or number out of any text — de-duplicated and one per line.Remove Line BreaksStrip line breaks, collapse extra spaces, trim whitespace and delete blank lines — all with simple toggles.