Does Undouble Space Lines upload my file or text to Tool-You servers?

No. Undouble Space Lines runs in this browser tab. Files stay on the device. Limit note: Non-empty text.

Should I use Double Space Lines instead of Undouble Space Lines?

Use Undouble Space Lines when you need Collapse double-spaced lines. Use Double Space Lines when you need Insert blank lines between lines. They share a category (Text) but not the same job.

Undouble Space Lines

Collapse double-spaced lines.

Turns blank-line gaps back into single newlines. Unlike Double Space Lines this compresses. Empty fails.

What Undouble Space Lines does

Turns blank-line gaps back into single newlines. Unlike Double Space Lines this compresses. Empty fails.

The interactive controls for Undouble Space Lines load after this article so crawlers still read the instructions. Path /text/undouble-space-lines is the canonical address. Work happens on this device; Tool-You does not take a copy of the file or pasted text for Undouble Space Lines.

How to use Undouble Space Lines

Keep this tab on Undouble Space Lines (/text/undouble-space-lines). Pasting into the wrong Text tool (for example Double Space Lines) changes the job.
Paste or type the input Undouble Space Lines expects. Path hint: text · undouble space lines. Collapse double-spaced lines.
Apply the Undouble Space Lines action only. Collapse Whitespace is a different transform (Squeeze spaces/tabs; optional end trim.). Turns blank-line gaps back into single newlines. Unlike Double Space Lines this compresses. Empty fails.
Copy the output of Undouble Space Lines if you need it elsewhere. Size/complexity still follows: Non-empty text.
If the text job is actually Insert blank lines between lines., leave Undouble Space Lines and open Double Space Lines.

When not to use Undouble Space Lines

Skip Undouble Space Lines when a neighbor tool matches better — start with Double Space Lines or Collapse Whitespace — or when the description already warns the job will fail. In the tool’s own words: Turns blank-line gaps back into single newlines. Unlike Double Space Lines this compresses. Empty fails.

Questions about Undouble Space Lines

What does Undouble Space Lines do that other Text pages on this site do not?: Turns blank-line gaps back into single newlines. Unlike Double Space Lines this compresses. Empty fails. Short version: Collapse double-spaced lines.
Does Undouble Space Lines upload my file or text to Tool-You servers?: No. Undouble Space Lines runs in this browser tab. Files stay on the device. Limit note: Non-empty text.
Should I use Double Space Lines instead of Undouble Space Lines?: Use Undouble Space Lines when you need Collapse double-spaced lines. Use Double Space Lines when you need Insert blank lines between lines. They share a category (Text) but not the same job.
What are the limits of Undouble Space Lines?: Non-empty text. Also: Turns blank-line gaps back into single newlines. Unlike Double Space Lines this compresses. Empty fails.