How it works?
- Paste one item per line.
- Choose case and whitespace options.
- Remove duplicates and review the list.
- Copy or download the unique lines.
Remove Duplicate Lines
Clean duplicate lines from a list with case, whitespace, blank-line and sorting options.
- ✓Free to use
- ✓No registration
- ϟSimple workflow
- ✓Works on any device
Input & results
Enter your content and choose the action you need.
Paste text to begin. Up to 1,000,000 characters and 10,000 data rows.
Your Security, Our Priority
- Input stays in your browser.
- No input is uploaded for processing.
- Reports are generated on your device.
- Clear removes input from the workspace.
Processed locally in your browser
Supported
- Plain text, one item per line
- 1 million input characters / 10,000 lines
- Case, whitespace and sorting options
- Download format: TXT
Tips
- The first matching line is kept.
- Whitespace options affect matching only.
- Sorting is optional.
- Keep your original list for reference.
Practical guide
How to use Remove Duplicate Lines
What this tool helps you do
Remove repeated items from a plain-text list while keeping the first occurrence of each matching line. Case and surrounding-space options control which lines count as duplicates; they do not rewrite the retained line.
When it is useful
- Cleaning a copied list of identifiers
- Removing repeated names or labels
- Preparing a unique list for another tool
A practical example
apple, banana, apple, orange, banana on five separate lines produces apple, banana, orange: three unique lines and two removed duplicates. With Ignore letter case, APPLE and apple match; the first spelling remains in the output.
Limitations and common mistakes
Exact matching is the default. Ignoring case can merge identifiers that should stay distinct. Ignoring surrounding spaces does not collapse spaces inside a line. The first retained line keeps its original whitespace. Sorting changes order, so leave it off when sequence matters.
How to use Remove Duplicate Lines
- Paste one item per line.
- Choose whether to ignore letter case or surrounding spaces.
- Optionally remove blank lines or sort the result.
- Remove duplicates and review the counts, then copy or download.
Inputs and processing
Runs in the browser. Limits: 1,000,000 characters and 10,000 lines. CRLF and CR line endings are normalized to LF. A single final line terminator does not create an extra input line. Blank-line removal treats whitespace-only lines as blank. Sorting uses the browser locale; accented-character order can vary by browser settings.
Frequently asked questions
Does this change capitalization?
No. Case-insensitive matching keeps the first original line exactly as entered.
Can I undo changes?
The original input remains in the left field until you edit it or choose Clear. Keep a source copy if you need to return later.