Does this remove whitespace from the middle of an item?

No, only leading and trailing whitespace is removed, exactly what `String.prototype.trim()` does; internal spaces within an item are left alone.

What happens to an item that's only whitespace?

It becomes an empty string, since trimming removes all of its characters. Use Empty List Item Remover afterward if you want those items dropped entirely rather than kept as blanks.

Why would a pasted list have stray whitespace in the first place?

It's common when copying from spreadsheets, PDFs, or tables, where cell padding or alignment spaces get included in the copied text.

Does trimming affect the separator itself?

No, only the item content is trimmed; the separator between items is untouched (though comma-separated output is always rejoined with ", " for readability, per this category's separator convention).

List Item Trimmer - Trim Whitespace from List Items

Overview

Introduction

Data pasted from spreadsheets, PDFs, or web pages often carries stray leading and trailing spaces on each line, which can silently break comparisons, sorting, or lookups.

List Item Trimmer cleans this up by trimming whitespace from the start and end of every item in a list, leaving the actual content untouched.

What Is List Item Trimmer?

This is a per-item cleanup tool: it walks every item in a list and applies a standard trim operation to remove surrounding whitespace.

It's a common first step before deduplication, sorting, or statistical analysis, since stray whitespace can make otherwise-identical items look different.

How List Item Trimmer Works

The list is split into items using your chosen separator, then each item is passed through `String.prototype.trim()`, which removes whitespace from both ends.

The trimmed items are rejoined using the same separator to produce the cleaned-up output.

When To Use List Item Trimmer

Use this right after pasting data from an external source (spreadsheet, PDF, table) where stray whitespace is common.

It's a good first step before List Statistics Generator, since untrimmed whitespace can inflate duplicate counts and skew average lengths.

Often used alongside Empty List Item Remover, List Left-Padder and List Right-Padder.

Features

Advantages

Fixes a very common data-quality issue with a single click, no manual find-and-replace needed.
Never touches whitespace inside an item, only at the edges.
Works with any separator style.

Limitations

Doesn't remove internal whitespace or collapse repeated internal spaces; it only trims the edges of each item.
Items that are only whitespace become empty strings rather than being removed, pair with Empty List Item Remover if that's what you need.

Examples

Trimming stray spaces from pasted data

Input

"  a  ", "b ", "   c"

Output

a, b, c

Leading and trailing spaces are removed from all three items.

Trimming a whitespace-only item to empty

Input

a, "   ", c

Output

a, , c

The whitespace-only middle item becomes an empty string after trimming.

Best Practices & Notes

Best Practices

Run this before List Statistics Generator or any deduplication step, since stray whitespace makes otherwise-identical items look different.
Follow up with Empty List Item Remover if trimming reveals items that are now completely blank and should be dropped.

Developer Notes

Each item is passed through JavaScript's built-in `String.prototype.trim()`, which strips all leading and trailing Unicode whitespace characters, not just plain ASCII spaces.

List Item Trimmer Use Cases

Cleaning up a list pasted from a spreadsheet where cell padding added stray spaces
Normalizing data before comparing or deduplicating list items
Preparing a list for import into a system that's strict about exact string matches

Common Mistakes

Expecting internal whitespace within an item to be collapsed or removed; trim only affects the leading and trailing edges.
Not following up with Empty List Item Remover when whitespace-only items should be dropped rather than kept as blanks.

Tips

Combine with Empty List Item Remover for a complete cleanup pass: trim first, then drop anything that's now empty.
Run this before List Left-Padder or List Right-Padder so padding widths are based on the real content, not stray whitespace.

List Item Trimmer