Join Strings
Join a list of strings (one per line) with a delimiter. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Join Strings
- 1. Paste your list. Enter the items you want joined into the input pane, one per line, such as names, tags or values pulled from a spreadsheet column.
- 2. Choose a delimiter. Type whatever should sit between items into Delimiter, such as a comma and space, a pipe character, or a custom separator matching a downstream format.
- 3. Trim and skip blank lines if needed. Turn on Trim each line first to remove stray whitespace from each item, and Skip empty lines to drop blanks so they don't produce doubled delimiters in the result.
- 4. Copy the joined string. Copy the single combined line from the output pane into a CSV cell, a SQL IN clause, or anywhere a delimited list is expected.
When to use Join Strings
Join Strings collapses a list of lines into one delimited string, the reverse of splitting text apart. It's for turning a column of values, pasted one per line, into the comma-separated or pipe-separated form another tool or query expects.
- Building a SQL IN clause. You copied a list of IDs from a spreadsheet, one per row, and need them as a comma-separated list to paste into a SQL WHERE id IN (...) clause.
- Formatting tags for a CMS field. A blog post's tags are stored as separate lines in your notes but the CMS expects a single comma-separated tags field. Joining them produces the exact string to paste in.
- Preparing a CSV cell from multi-line notes. A multi-line note needs to become a single CSV cell without breaking the row structure. Joining with a semicolon keeps the values together on one line.
- Assembling a path from separate segments. You have folder names listed one per line and need them joined with slashes into a single file path for a script or config value.
Examples
Join lines with commas
Input
a b c
Output
a, b, c
About the Join Strings tool
Join Strings does its work locally, right in the browser. Join a list of strings (one per line) with a delimiter. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the String Tools collection on EditSafely, a set of 159 small, focused String utilities that share the same instant, private workspace.
You can shape the output with 3 settings, including Delimiter, Trim each line first and Skip empty lines, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Join Strings cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.