FileGizmo — Text tools
Remove duplicate lines
Deduplicate lists and pasted text while preserving the first occurrence and original order.
Simple by design
Remove duplicate lines in three steps
Clean email lists, keywords, identifiers, URLs, log excerpts, inventory values, or any multiline text without uploading it. FileGizmo preserves the first occurrence of each line and removes only later matches, so the original order remains stable and predictable.
Enable surrounding-space handling when lines should match despite accidental indentation or trailing spaces. The kept line retains its original formatting; trimming is used only to create the comparison key. Optional case-insensitive matching treats values such as Example and example as duplicates while preserving the first spelling. The result reports exactly how many lines were removed and how many remain.
All comparison work happens immediately in the browser using a set-based algorithm that scales linearly with the input size. No text is sent to a server or stored in an account. Review the cleaned output separately, copy it to the clipboard, or download a UTF-8 text file. Keyboard-friendly controls and responsive layouts keep the workflow comfortable on desktop and mobile.
- 1
Paste a list or multiline text
- 2
Choose space and letter-case matching rules
- 3
Remove duplicates copy or download the cleaned result
Good to know
Frequently asked questions
Is the original order preserved?
Yes. FileGizmo keeps the first occurrence and removes only later matches.
Can spaces be ignored?
Yes. Surrounding spaces can be ignored when comparing lines without rewriting kept lines.
Can matching ignore capitalization?
Yes. Enable case-insensitive matching to treat Example and example as duplicates.
Is pasted text uploaded?
No. Deduplication happens entirely within the browser.