Remove duplicate lines from any list — case-sensitive optional, whitespace-trim optional, count duplicates — browser-only
- Runs locally
- Category Text
- Best for Removing repetitive cleanup work from everyday writing and operations.
Original
0
Unique
0
Removed
0
What this tool does
Free online line deduplicator. Paste any list, remove duplicate lines with options to ignore case and trim whitespace. See how many lines were removed and the original count. Preserves order of first occurrence. 100% client-side.
Tool details
- Input
- Text
- The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
- Output
- Live result + Copy
- The result area focuses on usable output, with copy, download, or preview actions when supported.
- Privacy
- Browser-side processing
- The main tool logic does not call an external API, so inputs normally stay in the current tab.
- Save / share
- No account required
- Open the page and use it; whether results survive refresh depends on the tool.
- Performance budget
- Initial JS <= 8 KB
- No WASM budget is declared, keeping the tool quick to open on mobile.
- Best fit
- Text · Developer
- Category and role tags drive related tools, internal links, and quick fit checks.
How to use
-
1. Input
Paste or drop your content into the tool panel.
-
2. Process
Click the button. All processing is local in your browser.
-
3. Copy / Download
Copy the result or download to disk in one click.
How Text Deduplicator fits into your work
Use it to clean, compare, reshape, or extract plain text before it goes into a document, CMS, spreadsheet, or prompt.
Text jobs
- Removing repetitive cleanup work from everyday writing and operations.
- Making text easier to compare, paste, publish, or feed into another tool.
- Working with content locally when the text is private or unfinished.
Text checks
- Scan for unintended whitespace, duplicate lines, and lost punctuation.
- For long text, test the first few lines before applying the whole change.
- Copy the final output only after checking the preview.
Good next steps
These links move the current task into a more complete workflow.
- 1 Text Sorter Sort lines alphabetically, numerically, by length, or reverse — case-sensitive optional — browser-only Open
- 2 Word Counter Count words, characters, sentences, paragraphs and reading time in any text — instant, browser-only Open
- 3 Text Diff Compare two blocks of text — line-by-line additions, deletions, equal — colour highlighted, browser-only Open
FAQ
Tool combos
Folks in your role tend to reach for these alongside this tool.
- AES Text Encryptor Encrypt & decrypt text with a password — AES-256-GCM + PBKDF2 via WebCrypto — 100% in your browser, nothing uploaded
- Affine Cipher Encoder & Decoder Encrypt and decrypt the ax+b affine cipher with live modular-inverse check, browser-only
- Age Difference Calculator The exact gap between two birthdays — years/months/days, percentage, and the date one person is twice the other's age — browser-only
- AI Eval Planner Generate eval cases, pass criteria, and edge cases from an AI feature, risks, and user path.