What does Concatenate Lines do?

Concatenate Lines joins multiple text lines into a single line using a separator of your choice (comma, space, semicolon, custom text, etc.).

What separators can I use?

You can use any separator including comma, semicolon, pipe, space, tab, newline, or any custom string you specify.

Does it handle empty lines?

Yes, you can choose to skip empty lines or include them in the concatenation. Empty lines are filtered out by default.

Can I reverse the operation?

To split concatenated text back into lines, use the Split String tool with the same separator.

Is there a line limit?

No, the tool handles any number of lines. Works with both small lists and large datasets.

Concatenate Lines

Concatenate multiple lines into one

Input Data (one per line)

4 lines

Output (result)

apple|banana|cherry|orange

1 line

Remove duplicates

Concatenate Mode

Concatenate all lines into one

Join all into one line

Concatenate consecutive lines

Join every N consecutive lines into one line

Delimiter

Enter Content

Enter your text with each line separated

Select Mode

Choose to concatenate all lines or consecutive lines by number

Concatenate

Click "Concatenate" to join lines with your chosen delimiter

Copy Result

Copy the concatenated text to clipboard or download as file

Enter Content

Enter your text with each line separated

Select Mode

Choose to concatenate all lines or consecutive lines by number

Concatenate

Click "Concatenate" to join lines with your chosen delimiter

Copy Result

Copy the concatenated text to clipboard or download as file

About Concatenate Lines

Concatenate Lines is a powerful, free online tool designed to transform multi-line text into single-line or grouped formats by joining lines with a custom delimiter of your choice. Whether you need to convert a vertical list into a comma-separated string, join every few lines into groups, or create pipe-delimited output from line-separated data, this versatile tool offers two powerful modes to suit your specific concatenation needs.

The "Concatenate All Lines" mode joins every line into a single output line, perfect for creating comma-separated lists, URL parameters, or single-line data strings. The "Concatenate Consecutive Lines" mode groups lines by a specified number—combine every 2 lines to create key-value pairs, every 3 lines for name-email-phone records, or any custom grouping that matches your data structure.

The flexible delimiter system supports any character or string—commas, pipes, semicolons, spaces, custom text like " | ", or even special characters—giving you complete control over your output format. With intelligent duplicate removal, you can clean your data before concatenation, ensuring that repeated lines do not clutter your output.

This tool works entirely in your browser - no data is sent to any server, ensuring your information remains completely private and secure. Designed for developers, data processors, content managers, and anyone working with line-separated data, it processes thousands of lines instantly with results that can be copied to clipboard or exported as a file.

Key Features:

Dual Concatenation Modes

Join all lines into one single line, or group consecutive lines by a specified number. Perfect for both complete merging and structured grouping.

Custom Delimiter

Use any character or string: comma, pipe, space, or custom multi-character delimiters. Complete control over your output format.

Duplicate Removal

Optional cleanup to remove duplicate lines before concatenation

Common Use Cases

CSV Data Formatting - Convert vertical lists to comma-separated values
URL Parameter Building - Create query strings from parameter lists
Code Array Creation - Format lists into JavaScript/Python array syntax
Tag Lists - Convert multi-line tags to comma or space-separated format
Key-Value Pairing - Group every 2 lines to create paired data (consecutive mode)
Contact Records - Combine every 3 lines for name-email-phone formatting

About Concatenate Lines

Key Features:

Dual Concatenation Modes

Join all lines into one single line, or group consecutive lines by a specified number. Perfect for both complete merging and structured grouping.

Custom Delimiter

Use any character or string: comma, pipe, space, or custom multi-character delimiters. Complete control over your output format.

Duplicate Removal

Optional cleanup to remove duplicate lines before concatenation

Common Use Cases

CSV Data Formatting - Convert vertical lists to comma-separated values
URL Parameter Building - Create query strings from parameter lists
Code Array Creation - Format lists into JavaScript/Python array syntax
Tag Lists - Convert multi-line tags to comma or space-separated format
Key-Value Pairing - Group every 2 lines to create paired data (consecutive mode)
Contact Records - Combine every 3 lines for name-email-phone formatting

Concatenate Lines

Concatenate multiple lines into one

Enter Content

Select Mode

Concatenate

Copy Result

Enter Content

Select Mode

Concatenate

Copy Result

About Concatenate Lines

Key Features:

Common Use Cases

Frequently Asked Questions

Related Tools

Hey there! 💕

Concatenate Lines

Concatenate multiple lines into one

Enter Content

Select Mode

Concatenate

Copy Result

Enter Content

Select Mode

Concatenate

Copy Result

About Concatenate Lines

Key Features:

Common Use Cases

Frequently Asked Questions

Related Tools

Hey there! 💕