Does it ignore case when comparing lines?

No — comparison is case-sensitive by default, so lines that only differ in capitalization are kept as separate entries.

Does it ignore extra spaces?

No — lines are compared exactly as typed. Use the Remove Extra Spaces tool first if you need to normalize whitespace.

No — the first occurrence of each unique line keeps its original position.

Remove duplicate lines from a list. Paste your text and get back only the unique lines, in the order they first appeared.

Keeps the first occurrence of each line and preserves the original order.
Comparison is exact and case-sensitive, so "Apple" and "apple" are treated as different lines.
Runs entirely in your browser.

快速

无需等待或注册。大多数文件几秒钟内即可完成。

隐私保护

文件在内存中处理，处理完成后立即删除 — 绝不存储或分享。

免费

每个工具均可免费使用，核心功能无隐藏限制。