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Add Suffix
Put the same text at the end of every line.
Use {n} to insert the line number.
Quick Tool Overview
Add Suffix appends the same text to the end of every line — a file extension, a comma, a semicolon, a domain. Trailing whitespace is trimmed first by default, because a line ending in a space otherwise produces "name .txt" and the fault is invisible in a long list.
- What it does
- Adds text to the end of every line
- You give it
- A list, one item per line
- You get back
- The list with your suffix on every line
- Best for
- Extensions, delimiters, domains and statement terminators
About the Add Suffix
Appending to every line is the other half of the list-wrapping job, and it has its own set of everyday uses. A file extension after a list of names. A comma after every line to build a delimited list. A semicolon after a block of statements. A domain after a column of usernames to make email addresses.
The detail that matters here is trailing whitespace. A line that ends with a space gets the suffix after that space unless the line is trimmed first, which produces "name .txt" instead of "name.txt" — a small fault that is easy to miss in a long list. This trims by default for exactly that reason, and gives you the switch when you need the whitespace kept.
Key features of the Add Suffix
Trailing whitespace trimmed first
So the suffix sits against the text rather than after an invisible space that breaks the result.
Blank lines skipped
No line made up only of the suffix, unless you ask for every line to be treated identically.
The {n} placeholder
Annotate each line with its row position by putting {n} in the suffix.
Whole list at once
One action regardless of how many lines the list contains.
Points to the separator tool
The page says plainly when Prefix & Suffix Text is needed instead, for formats where the last line must differ.
How to use the Add Suffix
-
1
Paste your list
One item per line.
-
2
Type the suffix
The text to append to every line. Use {n} to insert the line number.
-
3
Check the trimming
Trailing whitespace is removed first by default, so the suffix sits directly against the text.
-
4
Copy the result
Copy or download the finished list.
Frequently asked questions
Because the suffix lands after it. A line ending in a space produces "name .txt" rather than "name.txt", which is invisible in the output and breaks whatever consumes it. Trimming first avoids it entirely.
Yes, every line is treated the same. If you need the separator omitted after the last item — as valid JSON and SQL require — use Prefix & Suffix Text, which has a proper separator mode.
Yes, and they are skipped by default. A line containing only the suffix is rarely intended, though there is a switch for the cases where every line must be treated identically.
Yes. Put {n} anywhere in the suffix and it is replaced with the line number, which is how you annotate a list with its row positions.
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