Join Lines
Merge a list of lines into a single line with any separator — comma, space, tab or your own. Optionally trim each line, drop blanks, and wrap lines with a prefix/suffix. Everything runs in your browser.
About this tool
Join Lines merges a list of lines into a single line — paste your lines and choose what goes between them.
- Separator — the text placed between lines. Type a comma, a space, a pipe
|, or anything you like. Use\tfor a tab and\nfor a newline, and\\for a literal backslash. Leave it blank to concatenate the lines with nothing in between. - Trim each line — strip leading and trailing whitespace from every line before joining.
- Remove blank lines — drop empty or whitespace-only lines instead of joining them.
- Prefix each line / Suffix each line — wrap every line, for example with
quotes to build a comma-separated list or parentheses for a SQL
IN (…)clause.
Everything runs locally in your browser via WebAssembly — your text is never uploaded.
Handy for
- Turning a column of values into a comma-separated list for a spreadsheet, CSV or config file.
- Building a SQL
IN ('a', 'b', 'c')clause from a pasted list of IDs. - Collapsing a multi-line snippet into one line for a single-line field or log.
- Joining words or tokens with a custom delimiter such as a tab or pipe.
FAQ
How do I use a tab (or a literal backslash) as the separator?
Type the escape into the separator box: \t becomes a tab, \n a newline,
\r a carriage return, and \\ a literal backslash. Any other backslash
sequence is kept as-is, so a separator like \d really joins with the two
characters \d.
How do I turn a list of IDs into a SQL IN (...) clause?
Set Prefix and Suffix both to ' and keep the default , separator:
alice
bob
joins to 'alice', 'bob' — paste it straight into IN (…). The prefix and
suffix wrap every line before joining, so quotes never end up around the
separator.
What counts as a blank line for "Remove blank lines"?
Empty lines and whitespace-only lines (spaces or tabs) are dropped, even
when "Trim each line" is off. Dropped lines get no prefix, suffix or
separator, so you never see '', '' artifacts from stray empty rows at the
end of a paste.
What happens if I leave the separator blank?
The lines are concatenated with nothing between them — useful for stitching a
wrapped Base64 string or hex dump back into one unbroken token. (The default,
when the field is untouched, is ", ".)
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool join-lines "Paste lines to join…"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/join-lines/?text=Paste%20lines%20to%20join%E2%80%A6&separator=%2C%20&trim=true&remove_blank=true&prefix=%27&suffix=%27Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.