Change the Length of a List
Add or remove list items to make it a certain length. 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 Change the Length of a List
- 1. Paste your list. Enter your items into the input pane, one per line. This works whether the list needs to grow, shrink, or stay the same length.
- 2. Set the new length. Enter the target number of items in New length. If it is greater than the current length, items get added; if smaller, items get cut from the end.
- 3. Enter a pad item. Type the value to insert when the list needs to grow in Pad item. This filler value is appended as many times as needed to reach the target length.
- 4. Copy the resized list. The output pane shows the list adjusted to exactly your requested length. Copy the resized result wherever a fixed-length list is required.
When to use Change the Length of a List
Change the Length of a List forces a list to a specific item count, either trimming it down or padding it out with a filler value. Use it whenever a downstream system expects an exact number of entries.
- Padding a list to fit a fixed-size table. A report template has exactly ten rows regardless of data, and if your list is shorter, padding it out with a placeholder value fills the remaining rows.
- Trimming a list to match an array length limit. An import script only accepts a fixed number of entries, and setting the new length shorter than your current list trims off the extras from the end automatically.
- Matching two lists to the same size for pairing. You are pairing up two lists that need equal length before zipping them together, and setting one list's new length to match the other prepares it.
- Filling out a placeholder grid with default values. A grid layout expects a set number of cells, and padding a shorter list with a default filler item like 'x' gives you the exact count the layout needs.
Examples
Grow a list to four items
Input
one two
Output
one two x x
About the Change the Length of a List tool
Change the Length of a List is a free online tool that works entirely inside your web browser. Add or remove list items to make it a certain length. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 114 List utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 2 settings, including New length and Pad item, 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.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Change the Length of a List free to use?
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?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
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?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
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.