Calculator
What the Add Prefix and Suffix to Lines does
Add Prefix and Suffix to Lines: calculates Lines and Output from Lines, Prefix and Suffix. Example: prefix - , suffix (empty) and line numbers None gives lines 3.
The Add Prefix and Suffix to Lines takes Lines, Prefix, Suffix and Line numbers and returns Lines and Output. The result recalculates on every keystroke without a button press or a page reload.
It is mostly used by people preparing copy for publishing. Doing this by hand is tedious and error-prone once the text runs past a few lines.
This runs client-side, which means we never receive what you enter and could not retrieve it if asked.
Further down the page: what each field expects, how the result is derived, and one example worked from the defaults.
What do the Add Prefix and Suffix to Lines fields mean?
The Add Prefix and Suffix to Lines uses 7 inputs. The form opens pre-filled, so the fastest way in is usually to overwrite the one field you actually care about.
| Field | What to enter | Default |
|---|---|---|
| Lines | paste or type any amount of text | apple banana cherry |
| Prefix | optional | - |
| Suffix | optional | none |
| Line numbers | choose from None, 1. 2. 3., 1) 2) 3) or 01 02 03 (padded) | None |
| Wrap each line in | choose from Nothing, Double quotes, Single quotes, Backticks or <li> tags | Nothing |
| Join lines with | choose from New line (keep as lines), Comma and space or Space | New line (keep as lines) |
| Skip blank lines | choose from Yes or No | Yes |
How does the Add Prefix and Suffix to Lines work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
The guard clauses run before the formula does, which is why mistakes surface next to the field.
Worked example
These are the values the Add Prefix and Suffix to Lines loads by default, and the result it produces from them. These are the tool’s own default values and the result they produce, not an invented illustration.
| Lines | apple banana cherry |
|---|---|
| Prefix | - |
| Suffix | (empty) |
| Line numbers | None |
| Wrap each line in | Nothing |
| Join lines with | New line (keep as lines) |
| Skip blank lines | Yes |
| Lines | 3 |
|---|---|
| Output | - apple - banana - cherry |
How to use it
- Paste your content into Lines.
- Key in Prefix.
- Fill in Suffix.
- Pick a value for Line numbers: the options are None, 1. 2. 3., 1) 2) 3) or 01 02 03 (padded).
- Pick a value for Wrap each line in: the options are Nothing, Double quotes, Single quotes, Backticks or <li> tags.
- Pick a value for Join lines with: the options are New line (keep as lines), Comma and space or Space.
- Pick a value for Skip blank lines: the options are Yes or No.
- The tool reacts immediately rather than waiting for you to finish the form.
- The results panel then shows Lines and Output.
- Both Copy Link and Print capture the current state, so pick whichever suits how you file things.
What this tool does not do
- Word and character definitions vary between tools: this one counts whitespace-separated tokens.
- Very large pastes are limited by your browser memory rather than a server quota.
- It does not account for anything you did not enter, by definition.
Frequently asked questions
Lines, Prefix, Suffix, Line numbers, Wrap each line in, Join lines with and Skip blank lines. That is the whole form. A starting value is in place for each, which means a single edit is enough to get a meaningful answer.
With the values loaded when the page opens, lines comes out as 3. It recalculates the moment an input changes, which makes comparing scenarios quick.
It never leaves the tab. The page does the work itself rather than asking a server to.
It costs nothing, and there is no limit on repeat use.
Reliable for the case described. Where more than one convention exists, the method section says which one is used.