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

No. Unique Lines Keep runs in this browser tab. Files stay on the device. Limit note: First-seen lines kept. Empty fails.

Should I use Count Lines instead of Unique Lines Keep?

Use Unique Lines Keep when you need Deduplicate lines keep order. Use Count Lines when you need Line count and non-empty lines. They share a category (Developer) but not the same job.

Unique Lines Keep

Deduplicate lines keep order.

Keeps first occurrence of each line. Unlike Remove Blank Lines this dedupes any lines. Unlike Count Lines this rewrites content. Empty fails.

What Unique Lines Keep does

Keeps first occurrence of each line. Unlike Remove Blank Lines this dedupes any lines. Unlike Count Lines this rewrites content. Empty fails.

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

How to use Unique Lines Keep

Keep this tab on Unique Lines Keep (/developer/unique-lines-keep). Pasting into the wrong Developer tool (for example Count Lines) changes the job.
Paste or type the input Unique Lines Keep expects. Path hint: developer · unique lines keep. Deduplicate lines keep order.
Apply the Unique Lines Keep action only. Join With is a different transform (Join lines with part count.). Keeps first occurrence of each line. Unlike Remove Blank Lines this dedupes any lines. Unlike Count Lines this rewrites content. Empty fails.
Copy the output of Unique Lines Keep if you need it elsewhere. Size/complexity still follows: First-seen lines kept. Empty fails.
If the text job is actually Line count and non-empty lines., leave Unique Lines Keep and open Count Lines.

When not to use Unique Lines Keep

Skip Unique Lines Keep when a neighbor tool matches better — start with Count Lines or Join With — or when the description already warns the job will fail. In the tool’s own words: Keeps first occurrence of each line. Unlike Remove Blank Lines this dedupes any lines. Unlike Count Lines this rewrites content. Empty fails.

Questions about Unique Lines Keep

What does Unique Lines Keep do that other Developer pages on this site do not?: Keeps first occurrence of each line. Unlike Remove Blank Lines this dedupes any lines. Unlike Count Lines this rewrites content. Empty fails. Short version: Deduplicate lines keep order.
Does Unique Lines Keep upload my file or text to Tool-You servers?: No. Unique Lines Keep runs in this browser tab. Files stay on the device. Limit note: First-seen lines kept. Empty fails.
Should I use Count Lines instead of Unique Lines Keep?: Use Unique Lines Keep when you need Deduplicate lines keep order. 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 Unique Lines Keep?: First-seen lines kept. Empty fails. Also: Keeps first occurrence of each line. Unlike Remove Blank Lines this dedupes any lines. Unlike Count Lines this rewrites content. Empty fails.