Line Joiner (Merge Lines)
Join multiple lines into one, with a custom separator.
What is the Line Joiner?
This tool does the opposite of a line-splitter: it takes text with one item per line and merges it all into a single line, joined by whatever separator you choose — a comma, a space, a pipe, or anything custom.
How to use it
- Paste your list into the box, one item per line.
- Pick a separator, or choose "Custom" to type your own.
- Copy the joined result.
This comes up when you need to turn a column of spreadsheet data into a comma-separated list for a formula or an API parameter, build a single search query from a list of keywords, or convert a list of tags on separate lines into a single tag string. Skipping blank lines and trimming whitespace avoids stray separators or extra spaces sneaking into the joined result from a messy paste. Everything runs locally in your browser, so lists of any length can be joined instantly.
Want the "why" behind this tool? Read Why a Comma-Separated List Breaks If the Separator Isn't Consistent.