Remove Duplicates Online
Paste text, drop a .txt or .csv file, and get a clean deduplicated list — sort, ignore case, trim whitespace, or find duplicates. Deduplication runs in your browser.
Paste/type up to 300 KB · local text files up to 10 MB per file and batch · CSV is plain text
Duplicate-removal workflows
Choose the workflow that matches your input
Each route uses the local processing engine with defaults and guidance for one clearly defined task.
Text and list dedupe
Duplicate Remover Online for Text & Lists
Choose matching, keep, sorting, and result-view rules for mixed text or list input.
Line dedupe
Remove Duplicate Lines Online
Treat each newline as one item, then remove, find, or count repeated lines.
List dedupe
Remove Duplicates From a List Online
Split one list by comma, tab, or another delimiter and keep stable item order.
TXT and local text files
Remove Duplicates From TXT Files
Start with local TXT or plain-text files, process them in the browser, and download the result.
What is Remove Duplicates Online
A free browser-based tool to remove duplicate lines or items from text, lists, and text files. Use new lines, commas, semicolons, tabs, or a custom delimiter; preserve order or sort; and switch between deduped, repeated, and once-only results.
- Simple & FastClean your lists in seconds with our straightforward, efficient deduplication tool.
- No InstallationWorks directly in your browser - no downloads, plugins, or software installation required.
- Privacy-FocusedDeduplication runs locally in your browser. Processed text and file contents are not uploaded; when enabled, Microsoft Clarity and Google Analytics may process limited usage telemetry.
How to Use Remove Duplicates Online
Clean your lists in four simple steps — no button clicks needed, results update as you type.
Key Features of Our Deduplication Tool
Everything you need to efficiently clean and organize your text lists.
Duplicate Removal
Identify duplicate lines or items, keep the first or last occurrence, and preserve input order unless you choose sorting.
Case Sensitivity Options
Choose whether to treat differently capitalized words as duplicates (e.g., 'Apple' vs 'apple').
Leading Space Preservation
Option to maintain spaces at the beginning of lines for preserving formatting.
Alphabetical Sorting
Automatically organize your deduplicated list in alphabetical order for easier reference.
Bounded Large-Result Preview
Large results use a bounded on-page preview, while Copy and Download continue to use the complete result.
Automatic Local Processing
Results update in the browser as the input or options change; no server round trip is required for deduplication.
Example Use Cases
Frequently Asked Questions
Have questions about our duplicate removal tool? Find answers below.
Is this tool completely free to use?
Yes, Remove Duplicates Online is completely free to use with no limitations on the number of lists you can process.
Is there a limit to how much text I can process?
Pasted or typed text is limited to 300 KB of UTF-8 data. Each selected file must be 10 MB or smaller, and one file batch must total 10 MB or less.
Is my text uploaded for processing?
No. Deduplication runs locally in your browser, so the text and file contents you process are not sent to a server for processing.
Does the tool parse CSV columns and quoted fields?
No. CSV files are read as plain text. You can dedupe complete lines or raw delimiter-separated items, but the tool does not parse headers, columns, quoted delimiters, escaped quotes, or multiline fields.
Can I use this tool for commercial purposes?
Yes, you can use Remove Duplicates Online for both personal and commercial purposes without any restrictions.
How does Ignore case work?
When enabled, values such as 'Apple', 'apple', and 'APPLE' match as duplicates. The retained output still follows your Keep first or Keep last setting.
Can I save my results for future use?
Copy the complete result to your clipboard or download it as a TXT file. The site does not create an account or cloud history for your processed text.
Ready to Clean Your Lists?
Try our free duplicate removal tool now - no registration required.