Left-pad Integers is a simple browser tool that takes numbers and pads them from the left with a specific character. Want to turn 7 into 007? Or make every number exactly 5 characters long? This tool’s got your back. It’s perfect for formatting lists, aligning outputs, or preparing data for fixed-width columns all in real time.
It works entirely in the browser, with no loading or server calls, and you can paste, import, or type freely.
How to Use:
- Paste your numbers into the input box on the left one integer per line
- You can also import a file (like
.txt
,.csv
, or.json
) using the “Choose File” button - Adjust the Options:
- Ignore non-integers – skip any lines that aren’t valid integers
- Remove duplicates – only keep unique numbers
- Maximize output – stretch the output area to see more results
- Set Pad to length – the final length you want all integers to be (e.g.
5
turns8
into00008
) - Choose Pad with – the character you want to fill with (default is
0
, but it could be*
,_
, etc.) - Output updates live whenever you change anything
- Use Copy Output to copy the result to clipboard
- Use Export to File to download your padded integers
- Hit Clear All to reset everything
What Left-pad Integers can do:
Left-pad Integers helps you bring structure to your numeric lists. Whether you’re prepping values for a log file, padding database IDs, or generating visually aligned output, this tool ensures every number reaches the exact width you set. It works great for both personal and technical uses no installs, no config, just a clean UI with all the controls in one place.
You can import data, set padding rules, trim bad input, and even de-dupe in a click. And with live updates and a counter below the output, you’ll know exactly what it’s doing the whole time.
Example:
Before (input):
7
42
123
8
1024
After (pad to length = 5, pad with = 0):
00007
00042
00123
00008
01024
Common Use Cases:
Left-pad Integers is ideal when you need consistent-length numbers like in CSV files, logs, or terminal tables. It’s great for formatting IDs, sorting values that need visual alignment, or ensuring output doesn’t shift around when printed. You can paste or import big lists, adjust the padding in real-time, and copy or export the final list with ease.
Useful Tools & Suggestions:
After padding with Left-pad Integers, try Right-pad Integers to balance things out or match a specific format. And if you’re displaying columns of numbers, Center Integers can help align everything neatly in the middle.