Delete Unique List Items
Remove items that are unique. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Delete Unique List Items
- 1. Paste your list. Enter your items into the input pane, one per line. Any list where you want to keep only the values that show up more than once works here.
- 2. Check the filtered result. There are no settings to configure. The tool removes every item that appears exactly once, keeping only the entries that repeat somewhere in the list.
- 3. Copy the remaining list. The output pane shows every occurrence of the items that repeated, with singleton items removed. Copy the filtered result wherever it is needed.
When to use Delete Unique List Items
Delete Unique List Items removes every item that appears only once, leaving all occurrences of the values that repeat. This is the opposite of finding unique values, keeping the duplicates and dropping the singletons.
- Isolating values that occur more than once for review. A list of customer IDs mostly contains one-off entries, but you specifically want to review the ones that show up more than once, which this tool isolates directly.
- Finding recurring words in a text sample. A list of words extracted from a document is being checked for terms used more than once, and removing the unique words leaves only the recurring ones for further study.
- Auditing a list for accidental repeats worth investigating. An export of order numbers should have no repeats, so keeping only the repeated values shows exactly which ones need investigating as likely duplicates.
- Preparing input for a duplicate-focused frequency chart. You want a chart that shows only items appearing more than once, and stripping the singletons first with this tool gives you exactly that filtered input.
Examples
Keep only repeated items
Input
cat dog cat bird
Output
cat cat
About the Delete Unique List Items tool
Delete Unique List Items runs as plain JavaScript in your browser tab, with no server behind it. Remove items that are unique. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's List Tools section, 114 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Delete Unique List Items cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.