Remove duplicate characters

Client

Keep the first occurrence of each character—distinct from duplicate line removal.

About Remove duplicate characters

Drop repeated characters while keeping first-seen order—optional case folding—in your browser. 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.

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.
  • Reverse text — Flip string character order by Unicode code point—copy reversed text locally in your browser. for the next text or markup step in your edit loop.
  • Remove accents — Strip diacritics with Unicode NFD—ASCII-friendly slugs and legacy normalization in the browser. for the next text or markup step in your edit loop.
  • String case converter — camelCase, snake_case, kebab-case, PascalCase, CONST_CASE from one paste—client-side. for the next text or markup step in your edit loop.

Common use cases

  • Collapse repeated punctuation in messy paste.
  • Build unique character sets for puzzles or tests.
  • Quick cleanup before line-level dedupe tools.

Common mistakes to avoid

  • Confusing with line dedupe

    This operates on characters, not whole lines.

  • Unicode combining marks

    Each code unit is deduped separately—normalize first if needed.

FAQ

Remove duplicate lines?

Use remove duplicate lines for row-level dedupe.

Case-insensitive?

Toggle case-sensitive dedupe off to fold A/a together.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • remove duplicate characters online
  • unique characters string tool
  • dedupe letters preserve order browser
  • collapse repeated chars in text

More tools

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