This tool pads numeric lines with leading zeros to a fixed width, useful for IDs and sorting — in your browser.
How to use it
- Paste numbers, one per line.
- Numeric lines are padded to width 4.
- Copy the zero-padded result.
About Zero-Pad Numbers
Leading zeros keep identifiers aligned and sortable — 0001, 0002, … 0010 sort correctly where 1, 2, 10 do not. This tool pads each purely numeric line with leading zeros to a width of four. Non-numeric lines are left untouched. It runs entirely in your browser.
FAQ
What width does it pad to?
It pads numbers to four digits; longer numbers are left as-is.
Does it touch non-numeric lines?
No — only lines that are purely numeric are padded.
Why zero-pad?
So identifiers align visually and sort in the correct numeric order as text.