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

No. Number Lines runs in this browser tab. Files stay on the device. Limit note: Start index integer. Empty fails.

Should I use Count Lines instead of Number Lines?

Use Number Lines when you need Prefix lines with 1. 2. 3. Use Count Lines when you need Line count and non-empty lines. They share a category (Developer) but not the same job.

Number Lines

Prefix lines with 1. 2. 3.

Adds numbered prefixes starting at N. Unlike Prefix Lines this auto-increments. Empty fails.

What Number Lines does

Adds numbered prefixes starting at N. Unlike Prefix Lines this auto-increments. Empty fails.

This URL is only for Number Lines (developer · number lines dev). Prefix lines with 1. 2. 3. Other Developer tools on Tool-You look similar in the chrome, so the job definition below is the part that belongs to Number Lines alone: Adds numbered prefixes starting at N. Unlike Prefix Lines this auto-increments. Empty fails.

How to use Number Lines

Keep this tab on Number Lines (/developer/number-lines-dev). Pasting into the wrong Developer tool (for example Count Lines) changes the job.
Paste or type the input Number Lines expects. Path hint: developer · number lines dev. Prefix lines with 1. 2. 3.
Apply the Number Lines action only. Prefix Lines is a different transform (Prefix lines with counts.). Adds numbered prefixes starting at N. Unlike Prefix Lines this auto-increments. Empty fails.
Copy the output of Number Lines if you need it elsewhere. Size/complexity still follows: Start index integer. Empty fails.
If the text job is actually Line count and non-empty lines., leave Number Lines and open Count Lines.

When not to use Number Lines

Skip Number Lines when a neighbor tool matches better — start with Count Lines or Prefix Lines — or when the description already warns the job will fail. In the tool’s own words: Adds numbered prefixes starting at N. Unlike Prefix Lines this auto-increments. Empty fails.

Questions about Number Lines

What does Number Lines do that other Developer pages on this site do not?: Adds numbered prefixes starting at N. Unlike Prefix Lines this auto-increments. Empty fails. Short version: Prefix lines with 1. 2. 3.
Does Number Lines upload my file or text to Tool-You servers?: No. Number Lines runs in this browser tab. Files stay on the device. Limit note: Start index integer. Empty fails.
Should I use Count Lines instead of Number Lines?: Use Number Lines when you need Prefix lines with 1. 2. 3. Use Count Lines when you need Line count and non-empty lines. They share a category (Developer) but not the same job.
What are the limits of Number Lines?: Start index integer. Empty fails. Also: Adds numbered prefixes starting at N. Unlike Prefix Lines this auto-increments. Empty fails.