Remove Duplicate Lines
Deduplicate lines while keeping first-seen order.
How to use
- 粘贴文本后自动去重，重复行只保留第一次出现的位置。
- 「忽略首尾空格」会先修剪每行再比较；「忽略大小写」对英文行不区分大小写。
- 默认区分大小写、保留原始顺序，不会静默修改你的内容。
- 统计区显示原始行数、去重后行数和删除的重复行数。
FAQ
Does Remove Duplicate Lines upload my data?
No. Processing stays in your browser and is not uploaded.
Do I need an account?
No. Open and use — no signup.
How is this different from upload-based tools?
Tools run locally in your browser; content is not sent to our servers for processing.
Are there limits?
Limited by device memory and the browser; very large inputs may slow the page.