Quick Answer
Duplicate text usually comes from copied reports, exported lists, merged spreadsheets, or repeated notes. Remove duplicates by choosing the right unit first: lines, words, sentences, or paragraphs.
Step-by-Step
- Decide whether each item is a line, word, sentence, or paragraph before deduplicating.
- Trim whitespace and optionally ignore case so hidden spacing and capitalization do not create false unique values.
- Choose whether to keep the first occurrence, last occurrence, or only values that appear once.
- Copy or download the cleaned result, then spot-check removed items before using it in production.
Recommended Workflow
Open the most relevant calculator or utility first, enter a realistic starting point, then use the supporting tools to check assumptions, clean inputs, or prepare the final output.
FAQs
Should I ignore case when removing duplicates?
Ignore case when Apple and apple should count as the same item. Keep case-sensitive matching when capitalization changes the meaning.
What does unique lines only mean?
Unique lines only usually means keeping lines that appear exactly once and removing every repeated value, including the first copy.