Remove duplicate lines from your text with various options.
A duplicate line remover is essential for cleaning up messy lists, CSV data, log files, contact lists, and any text with repeated entries. Our free online duplicate line remover lets you remove duplicate lines from text instantly in your browser with options for case-insensitive matching, preserving blank lines, and sorting results alphabetically. Whether you're a developer cleaning log data, a marketer deduplicating email lists, a data analyst preparing datasets, or a student organizing research notes, this tool makes removing duplicate text lines fast and free.
The tool processes your text entirely in your browser — no server uploads, no data storage, complete privacy. You can toggle three options: ignore capitals (case-insensitive deduplication), keep blank lines at line starts, and sort results alphabetically. The output replaces the input text so you can quickly compare before and after by using undo or re-pasting your original.
From students cleaning up notes and programmers removing duplicate imports to business analysts preparing clean datasets, content creators organizing keyword lists, and everyday users tidying up copied text — this tool helps anyone remove duplicate lines quickly. No registration, no server uploads, no limits.
Tip: For large datasets, use a separate sample to test options first. The "Ignore capitals" option converts all lines to lowercase for comparison but preserves the original line casing in the output.
Removes repeated lines from text, keeping only unique entries. Options include case-insensitive matching and alphabetical sorting.
Yes, completely free with no limits, subscriptions, or hidden fees. Process unlimited text.
No. Start removing duplicates immediately without any account.
Yes. Processing happens entirely in your browser. Your text never leaves your device. No server upload occurs.
Treats lines as duplicates regardless of letter case. For example, "Hello" and "hello" are considered duplicates. Output uses the original line casing.
Preserves blank lines and leading whitespace in the output. Without this checked, blank lines and whitespace differences are trimmed.
Sorts the deduplicated lines alphabetically. With "Ignore capitals" checked, sorting is case-insensitive.
Any text with line breaks: lists, CSV data, log files, contact lists, code imports, keyword lists, notes, transcripts.
Browser memory limits apply. For best performance, keep text under 10MB. Very large files may slow down older devices.
Chrome, Firefox, Safari, Edge, and Opera. Works on desktop and mobile.
Yes, fully responsive for smartphones and tablets.
The output replaces the input. Copy your original text before processing if you need to keep it. Or use Ctrl+Z to undo the replacement.
Duplicate lines in text files waste space, cause errors in data processing, and make lists harder to read. Manually removing duplicates is tedious and error-prone. Our free online duplicate line remover solves this instantly.
A tool that scans text line by line, identifies repeated entries, and removes all but the first occurrence. Includes options for case-insensitive matching, blank line preservation, and sorting.
No installation, instant processing, customizable options, client-side privacy, completely free.
Clean your text data instantly. Remove duplicate lines with case-insensitive matching, sorting, and blank line control — entirely in your browser. No registration, no costs — try it now.