Merge Two Lists
Append a second list to the first. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Merge Two Lists
- 1. Paste the first list. Put one item per line into the main input pane. This list comes first in the merged result.
- 2. Paste the second list. Add the items to append into the Second list field, one per line. They are joined onto the end of the first list in order.
- 3. Decide whether to remove duplicates. Turn on Remove duplicate items if the same entry might appear in both lists and you only want it to show up once in the merged result.
- 4. Copy the merged list. Copy the combined list, first list followed by second list (and deduplicated if selected), into wherever the full combined set is needed.
When to use Merge Two Lists
Merge Two Lists appends a second list onto the end of the first, with an option to drop repeats so the union only contains each item once. Use Merge Two Lists whenever two separate lists need to become one combined list.
- Combining two contact exports without duplicates. You exported contacts from two different apps and some people appear in both. Merge the lists with Remove duplicate items on to get a single clean combined list.
- Building a full guest list from two RSVP forms. Two separate signup forms each collected names for the same event. Merge both lists into one master guest list before printing name tags.
- Combining tag lists from two articles. Two blog posts have their own tag lists and you want one combined tag set for a related-posts widget. Merge them and remove duplicates so each tag appears once.
- Appending new items to an existing list. You have an existing shopping list and a second list of items you just thought of. Merge the new items onto the end of the existing list in one step.
Examples
Append cherries and dates
Input
apples bananas
Output
apples bananas cherries dates
About the Merge Two Lists tool
Merge Two Lists does its work locally, right in the browser. Append a second list to the first. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the List Tools collection on EditSafely, a set of 114 small, focused List utilities that share the same instant, private workspace.
You can shape the output with 2 settings, including Second list (one item per line) and Remove duplicate items, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Merge Two Lists 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.