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How to Use Join Lines: Complete Guide (2026)
Learn how to use join lines free online — no signup, no download. Follow our step-by-step guide below.
What is Join Lines?
Join multiple text lines into a single line with a custom separator. Optionally remove blank lines and trim trailing spaces from each line. The inverse of the Split Text tool.
- 100% browser-based — no data uploaded to servers
- Free to use — no signup required
- Instant results — no waiting
- Works on all devices — mobile, tablet, desktop
How to Use Join Lines: Step-by-Step
- 1
Enter text lines
Type or paste text with multiple lines in the input box.
- 2
Set separator
Choose the separator to insert between lines (comma, space, newline, etc.).
- 3
Configure options
Toggle blank line removal and trailing space trimming.
- 4
Join
Click Join Lines. The merged line appears in the output.
Common Use Cases
CSV creation
Join lines with comma separator to create CSV data.
Array creation
Join lines with comma+space to create JavaScript/Python arrays.
Sentence merging
Join lines with space to merge broken sentences into paragraphs.
FAQ About Join Lines
What happens to blank lines?
When 'Delete blank lines' is enabled, blank lines are removed before joining. Otherwise, they produce empty segments in the output.
Is this the inverse of Split Text?
Yes. If you split by comma and then join by comma, you get back the original text (minus blank lines and trailing spaces if those options are enabled).
Ready to Try Join Lines?
No signup. No download. 100% free.