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A numbered list needs a specific start value, step, and format more often than a plain "1, 2, 3" - invoice line items that should start at 100, a step-by-step guide numbered by tens so items can be inserted later, or IDs that need zero-padding to a fixed width. This prefixes every line with a sequential number built exactly to those specs.
When you'd use this
Turning a plain list into a numbered guide or invoice line-item list, or generating a sequence of zero-padded IDs (like item-001, item-002) by pairing a custom separator with zero-padding.
Common errors
If numbers don't line up the way you expect with zero-padding on, check the padding width covers your largest number - padding to 2 digits will still let a 3-digit number through unpadded rather than truncating it, since truncating would silently lose data.
Frequently asked questions
Can I number by tens or skip values?
Yes - the step value controls the increment between lines, not just 1. A start of 10 with a step of 10 produces 10, 20, 30, and so on, which is useful for outline-style numbering where you want room to insert items later without renumbering everything.
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