Multi-Line to Single Line
Join multiple lines of text into a single line. Choose your separator: space, comma, pipe, semicolon, or custom. Optionally trim whitespace and skip blank lines.
Input Text (0 lines)
Lines: 0Output Length: 0
About Multi-Line to Single Line
This tool joins multiple lines of text into a single line with a separator of your choice. It is useful for converting CSV-style data, building command-line arguments, processing log output, or preparing data for spreadsheets. The trim option removes leading and trailing whitespace from each line before joining. The skip blank lines option removes empty lines that would otherwise produce consecutive separators.
Built and maintained by Meet Shah · Last updated
What this tool is used for
- Collapsing a multi-line value into one line for a field that requires it.
- Joining a list with a chosen separator for a config value.
- Producing a single-line string for a CSV cell or a URL parameter.
- Joining lines with a chosen separator so the parts stay distinguishable afterwards.
- Flattening a block before hashing or comparing it.
Frequently Asked Questions
- Which separators are available?
- Space, comma, pipe, semicolon, a real tab, or anything you type in the custom box. The comma, pipe and semicolon options include their surrounding space, so the result reads as a list rather than as one run-on string.
- What does trimming actually do to Windows text?
- More than it looks. A Windows file ends every line with CR LF, and splitting on the newline leaves the carriage return dangling at the end of each line. Trimming removes it; with trimming off, an invisible U+000D lands before every separator.
- Why does the output end with a stray separator?
- A file that ends in a newline has an empty final line, and with "skip blank lines" switched off that empty string is joined like any other. Leave the option on — it is the default — or delete the trailing newline first.
- How do I build a list for a SQL IN clause?
- Pick the comma separator with trimming on, and the result drops straight in: SELECT * FROM t WHERE id IN (1, 2, 3). Quote the values yourself if they are strings, and use proper CSV quoting for any value that contains a comma.
- Does it change anything inside a line?
- Only whitespace at the two ends, and only when trimming is on. Internal spacing, tabs and punctuation are untouched, so the join is reversible — split the result on your separator to get the lines back, provided no line contained that separator itself.
- Should the joined lines get a separator?
- Almost always — joining with nothing runs the last word of one line into the first of the next. A space suits prose; a comma or semicolon suits a list being flattened into a single value.
Common errors and gotchas
- Joining without a separator, which runs the last and first words together.
- Including blank lines, which produce doubled separators.
- Losing paragraph structure that the line breaks were carrying.
- Joining code, where a line break can be syntactically significant.
- Producing a line longer than the destination field will accept.
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