What This Tool Does
Sometimes you have a clean line-by-line list and need it as a single flat string — to paste into an SQL IN clause, a CSV cell, a configuration value, or a template field that expects comma-separated input. This tool takes one item per line and joins them with the separator you choose: comma, semicolon, pipe, or space. A space-after-separator option keeps the output readable (producing “apple, banana” rather than “apple,banana”), while the trim and skip-empty options clean up any accidental whitespace or blank lines before joining. The “Newline (no change)” separator is useful when you just want to deduplicate or trim a list without actually merging it.
How to Use
- Paste your line-by-line list into the input panel.
- Choose the separator that fits your target format — Comma for CSV, Pipe for SQL-style lists.
- Enable “Add space after separator” for more readable output (e.g., “a, b, c”).
- Keep “Trim each line” and “Skip empty lines” on to clean up the input automatically.
- Copy the merged result or download it as a text file.
Frequently Asked Questions
How do I create a comma-separated list for an SQL IN clause?
Paste your values one per line, select “Comma” as the separator, and enable “Add space after separator” if you prefer readable spacing. For SQL you may also want to wrap each value in single quotes first — you can do that with the Find & Replace tool by replacing the start of each line with a quote. The merged output is then ready to drop between the parentheses of anIN (...) expression.
What does the “Newline (no change)” separator do?
Selecting “Newline (no change)” keeps each item on its own line rather than joining them into a single string. The tool still applies any active trim and skip-empty options, so it acts as a quick cleaner for line-based lists without actually merging anything. This is handy as a lightweight preprocessing step before using the output in another tool.
Can I merge hundreds or thousands of lines at once?
Yes. The tool runs entirely in your browser with no server round-trip, so there is no practical file size limit other than your device's memory. Large lists from database exports, spreadsheet copies, or log files all process instantly. Just paste and copy — no upload, no waiting.
What is the difference between this and the List Splitter tool?
List Merger goes from many lines to one string; List Splitter goes the other direction — from a delimited string to one item per line. They are complementary tools: use List Splitter to break apart a CSV export for editing or sorting, then use List Merger to reassemble the modified items back into a flat string. Together they cover the full round-trip between line-based and delimiter-based list formats.