Text guide
How to remove duplicate lines
Removing duplicate lines means comparing complete lines and keeping one occurrence of each. Case rules and whitespace determine which lines are considered equal.
Open the Remove Duplicate Lines toolDecide what duplicate means
An exact comparison treats Blue, blue, and Blue as different lines. A case-insensitive comparison treats the first two as equal, but trailing whitespace can still matter unless the text is normalized first.
InputOrchid
fern
Orchid
FERN
Exact matching keeps three unique lines. Case-insensitive matching keeps two, preserving the first spelling encountered.
How to remove duplicate lines
- Paste the list into the ToolPixels Remove Duplicate Lines tool.
- Choose case-sensitive matching when capitalization distinguishes records.
- Choose whether to preserve the original order.
- Run the tool and inspect the removed-count report.
- Copy or download the cleaned list.
Preserve order or sort the result
Preserving order keeps the first occurrence and removes later repeats. This is useful for logs, queues, and curated lists where position has meaning. Sorting can make a vocabulary or inventory easier to scan, but it discards that original sequence.
If you need both deduplication and sorting, remove duplicates first, verify the count, then use the Sort Lines tool with the intended comparison mode.
Normalize only when appropriate
Trimming whitespace or ignoring case can merge records that a strict system treats as distinct. Product codes, usernames, paths, and hashes may be case-sensitive. Human-entered labels often benefit from normalization, but inspect representative examples before applying it to the full list.
- Keep a copy of the source.
- Check blank lines separately.
- Confirm whether first or last occurrence should win.
- Compare the input and output line counts.
Common questions
Which copy is kept?
When order is preserved, ToolPixels keeps the first matching line and removes later duplicates.
Are near-duplicates removed?
No. Spelling differences and extra characters remain unless the selected case rule makes them identical. This avoids fuzzy matches deleting valid data.