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Deduplicate Lines

AI / Agent

Remove duplicate lines from text: exact, case-insensitive, trimmed, or normalized matching. Useful for RAG dedup.

This is the AI-category, RAG-focused sibling of Line Operations' dedupe mode, tuned specifically for avoiding near-identical passages in a document index before you embed and store them. Exact matching removes perfect duplicates keeping the first occurrence, case-insensitive and trimmed matching handle inconsistent capitalization or stray whitespace from copy-pasting, and normalized matching typically lowercases, trims, and collapses repeated spaces before comparing so lines differing only in formatting are treated as duplicates. All modes compare text directly; none of them detect semantically similar but differently-worded duplicates, since that would require embedding-based similarity rather than string comparison. Everything runs client-side, and the first occurrence of any duplicate is always what's kept.

deduplicatededuplinesuniqueragchunks

How to use Deduplicate Lines

  • 1.Paste a list of lines and choose exact matching to instantly remove perfect duplicates, keeping the first occurrence.
  • 2.Use case-insensitive or trimmed matching when your data has inconsistent capitalization or stray whitespace from copy-pasting.
  • 3.Apply normalized matching before feeding text chunks into a RAG index, to avoid storing near-identical duplicate passages.

Frequently asked questions

Does this run in my browser or on a server?
Deduplication runs entirely client-side — your list of lines never leaves your browser.
What does "normalized" matching actually normalize?
It typically lowercases, trims whitespace, and collapses repeated spaces before comparing, so lines that differ only in formatting are treated as duplicates.
Does it detect semantically similar but differently-worded duplicates?
No — all modes compare text directly. For semantic near-duplicate detection (different wording, same meaning) you'd need embedding-based similarity, which this tool doesn't do.
Which occurrence does it keep?
The first occurrence of each duplicate is kept and later ones are removed, preserving original ordering.

Use via API, SDK, or MCP

cURL# Free: 1,000 req/day · Pro: 10,000 req/day
curl -X POST https://api.utilix.tech/v1/tools/deduplicate-lines \
  -H "Authorization: Bearer utx_live_..." \
  -H "Content-Type: application/json" \
  -d '{"text":"apple\nbanana\napple\ncherry\nbanana","strategy":"exact"}'

Get an API key from your dashboard · Full API docs →

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