List to Comma-Separated Converter

How to use

1. 1Paste your items into the input area, one per line. Or change Split items on to comma, semicolon, tab, pipe, space, or Smart if your input uses a different separator.
2. 2Tick Trim each item and Drop empty items to clean stray spaces and blank lines. Tick Remove duplicates (and Match case-insensitively if needed) to dedupe.
3. 3Optionally pick a sort order (A to Z, Z to A, or Natural for item2 before item10) and a Letter case mode (keep, lower, or UPPER).
4. 4Pick an Output delimiter (comma, comma plus space, semicolon, tab, pipe, newline, or custom). Tick English Oxford comma if you want 'a, b, and c' instead of a plain join.
5. 5Pick a per-item quote style if you need each item wrapped (single quotes for SQL, double quotes for JS/JSON, backticks, parens, brackets, braces, angle brackets, or a custom pair). Leave Escape inner quotes on so values with quotes stay valid.
6. 6Pick a wrap style for the whole output if you need a SQL IN clause (parens), a JS or JSON array (square brackets), a set literal (curly braces), quotes around the whole list, or a custom prefix and suffix.
7. 7Or just click a preset: Plain comma list, SQL IN clause, JS array of strings, Python list of strings, CSV row, Semicolon list, English Oxford comma, or Markdown bullets.
8. 8Copy the result with Copy output, or click Replace input with output to round-trip the joined string back through the splitter for another pass.

About this tool

List to Comma-Separated Converter joins a list of items into a single string using whichever delimiter, quoting, and wrapper you need. Paste one item per line, or switch the input mode to comma, semicolon, tab, pipe, space, or Smart (which splits on any common separator at once) so you can also reformat a list that arrived in the wrong shape. The pipeline is deterministic and runs top to bottom: split, trim each item, drop empty items, change letter case (keep, lower, or UPPER), deduplicate (case sensitive or insensitive), sort (original, A to Z, Z to A, or natural so item2 sorts before item10), limit to the first N items, wrap each item with a per-item quote style (single, double, backtick, parens, square brackets, curly braces, angle brackets, or your own pair), join with the chosen output delimiter (comma, comma plus space, semicolon, semicolon plus space, space, tab, pipe, newline, or any custom string), and optionally wrap the whole output (none, parens for a SQL IN clause, square brackets for a JS or JSON array, curly braces for a set literal, quotes around the whole list, or a custom prefix and suffix). Eight quick presets cover the shapes most people search for: plain comma list, SQL IN clause, JavaScript array of strings, Python list of strings, CSV row, semicolon list, English Oxford-comma sentence, and Markdown newline list. Inner-quote escaping is on by default and uses the right convention for each quote style: single quotes are doubled (SQL-safe), double quotes and backticks are backslash-escaped (JS-safe), so values like O'Brien or quoted strings stay syntactically valid when you paste the output into your IDE or database client. Useful for building a SQL IN clause from a column of IDs, turning a vertical email list into a single comma-separated header, converting a spreadsheet column into a JavaScript or Python array, generating a clean CSV row from a multi-line paste, building an English Oxford-comma sentence from a list of names, deduplicating and sorting a list before joining, and reformatting any list that arrived with the wrong separator. Everything runs locally in your browser, so the values you paste here never leave your device.

Free to use. Works in your browser. No signup, no login.