Line Numberer

About Line numberer

The line numberer adds numbers to the start or end of every line, and it can strip existing numbers back off. You control the first number, the step between numbers, zero padding and the text placed after each number. It is handy for referencing lines in a review, preparing a numbered list, or recovering plain text from code pasted with line numbers.

How to use it

1. Paste your lines into the Text box.
2. Choose Add numbers or Remove numbers under Action, and Prefix or Suffix under Position.
3. When adding, set Start at, Step, Zero padding (0 = off) and Separator, and tick Skip blank lines if wanted.
4. Review the Result and copy it, or download it as numbered.txt or unnumbered.txt.

Numbering by tens with padding

alpha

beta
gamma  (start 10, step 10, padding 4, separator ': ', skip blank lines)

0010: alpha

0020: beta
0030: gamma

When to use it

• Numbering the lines of a contract clause, poem or script so people can cite them.
• Creating BASIC-style line numbers in steps of ten to leave room for insertions.
• Stripping the numbers from code or a log copied from a viewer that included a line-number column.
• Appending a running counter to the end of each line for a checklist or import file.

Questions about Line numberer

Does skipping blank lines change the count?

Yes. With Skip blank lines on, empty lines are left unnumbered and the counter does not advance for them, so numbering stays continuous across the text that does appear.

Which numbering formats can it remove?

It recognizes numbers followed by a period, bracket, colon, dash, pipe or tab, as well as (1) and [1] styles, and matching patterns at the end of a line in suffix mode. Lines without a recognized number are left alone.

Can I use a tab or a custom symbol after the number?

Yes. The separator box accepts any text, and typing \t inserts a tab. The default is a period followed by a space.

What are the limits for padding and negative values?

Padding goes up to 12 digits. The start and step can be negative or zero, although a step of zero is treated as one, so numbers always change.

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