How do I merge lines with a comma?

Simply type a comma (,) followed by a space into the custom delimiter box. The tool will instantly join all your vertical lines horizontally, separated by that comma.

Can I merge lines without any spaces?

Yes. Just clear the delimiter input box entirely. The tool will stitch the lines together with absolutely no spaces or characters between them.

Is there a limit to how many lines I can join?

Because the joining process happens locally in your browser, you can instantly merge tens of thousands of lines without experiencing lag or reaching a server limit.

What is the difference between this and removing line breaks?

Removing line breaks usually just replaces them with a space. Merging lines allows you to define exactly what character (like a comma, pipe, or dash) replaces the line break.

Are my merged lists kept private?

Yes. No text data is sent to our servers. The JavaScript executes the merge directly on your device.

Merge Lines Tool — Join Text Lines Online

What Is the Merge Lines Tool?

The Merge Lines Tool joins multiple vertical lines of text into a single continuous string, replacing each line break with a custom separator — a comma, space, pipe, or any character you choose. It is the exact complement of the Split Text tool: where Split breaks one string into many lines, Merge collapses many lines into one.

How to Combine Multiple Lines into One

Copy your vertical list of items — from a spreadsheet column, text file, or database export.
Paste the list into the left text area.
Set your desired Separator in the input box, or click a preset button (Comma + Space, Pipe, etc.).
The merged output appears instantly in the right box. Click the copy icon to save it.

Where Can You Use the Merge Lines Tool?

SQL IN Clause Queries

Take a column of 500 IDs from Excel, paste them here, and instantly produce a comma-separated string ready to drop inside an SQL IN (id1, id2, id3) clause.

SEO & CMS Tag Fields

Merge a list of researched keywords into a comma-separated string to paste into WordPress, YouTube, or any CMS tag input that expects a delimited list.

Boolean Search Strings

Enter OR as the separator to join keyword lines into a Boolean search query for LinkedIn Recruiter, Google, or legal research databases.

Code Array Literals

Convert a vertical list of strings into a single-line array literal for JavaScript, Python, or any language — use , and wrap with brackets after copying.

Separator Options

Comma + Space (, ): Standard CSV-style separator. Suitable for SQL, JSON arrays, and tag inputs.
Space Only: Joins lines as words in a sentence — useful for merging a broken paragraph back into one line.
No Space: Concatenates lines with nothing between them — for building compound strings or identifiers.
Pipe ( | ): Common delimiter for database exports, TSV variants, and Boolean OR searches.
Custom separator: Type any string — a word, \n for a newline, \t for a tab, or any multi-character delimiter.

Best Practices and Limitations

All processing runs locally in your browser — no text is sent to any server, making it safe for confidential IDs, API keys, or internal data exports.

Empty lines in your input are automatically skipped — they are not joined with the separator. This prevents extra delimiters in the output when your list has blank rows between items. The tool handles tens of thousands of lines instantly; performance only degrades for inputs above several megabytes, where a command-line tool would be faster.

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Merge Lines Tool