Remove duplicate lines

Client

Case-sensitive exact line dedupe.

About Remove duplicate lines

Keep first occurrence of each line. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

a\nb\na\nc

Nearby workflows on Toolcore

  • Remove duplicate lines — Collapse repeated lines in pasted text—trim or case-fold keys, optional sort—browser-only deduper. for the next text or markup step in your edit loop.
  • Sort lines alphabetically — Locale-aware A→Z / Z→A line sorts plus reverse—optional trim or case folding, browser-only. for the next text or markup step in your edit loop.
  • Trim lines — Strip leading and trailing whitespace on each line—optionally remove empty lines locally. for the next text or markup step in your edit loop.
  • Word & character count — Words, characters, lines, and reading time—paste any text, all client-side. for the next text or markup step in your edit loop.

Common use cases

  • Remove duplicate lines for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.