Join Integers

The Join Integers tool takes a list of numbers and combines them into a single line using whatever delimiter you want. It’s perfect for converting newline-separated integers into a CSV line, a space-separated string, or something totally custom just flip the options and it updates instantly.

You can paste your list in, import a file, pick how to join them, and you’ll get a clean string in the output box. And yeah it updates live as you change anything.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total characters: 0
Options
Trim values
Ignore empty lines
Maximize output

How to Use:

  • Paste a list of numbers into the Input Text box (one per line).
  • Or click Choose File to import a supported text file.
  • Use the Trim values toggle to remove whitespace from each number.
  • Use the Ignore empty lines toggle to skip any blank inputs.
  • Select your delimiter: comma, space, newline, or enter a custom one.
  • The output updates live below as you change anything.
  • Click Copy Output to copy the joined string.
  • Use Export to File to download it.
  • Toggle Maximize output to expand the preview area.
  • Hit Clear All to reset everything.

What Join Integers can do:

This tool makes it super easy to turn a long list of numbers into something cleaner. Whether you’re building a CSV row, flattening data for scripts, or reformatting logs, Join Integers gives you total control. You can trim whitespace, skip blanks, and pick exactly how to separate your numbers. It handles files, has smart toggles, and gives you instant feedback while you tweak things.

Example:

Input:

1
2
3
4
5

Output (delimiter = comma):

1,2,3,4,5

Output (custom delimiter = dash):

1-2-3-4-5

Common Use Cases:

It’s great for reformatting number lists into clean inline strings for scripts, spreadsheets, or programming. You can quickly turn logs or column data into comma-separated values or custom formats for JSON, config files, or shell arguments no extra cleanup needed. Just paste, tweak, and grab your string.

Useful Tools & Suggestions:

After using Join Integers, try Add Commas to an Integer to make the output easier to read, especially if it’s a long sequence. And if you’re joining grouped data, Generate Integer Pairs helps prep structured sets before flattening them.

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