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Text Diff Checker

Compare two texts by line, word, or character, with side-by-side or unified views and options to ignore whitespace/case

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WHAT IS TEXT DIFF CHECKER?

Text Diff Checker compares two texts by line, word, or character, clearly marking additions, removals, changes, and unchanged content, with both side-by-side and unified view modes.

Line, word, and character comparison

  1. "Line" compares whole lines at a time — best for spotting structural changes in code or paragraphs.
  2. "Word" compares space/punctuation-delimited tokens — best for wording changes in prose. Since Chinese/Japanese text has no spaces between words, character mode is usually more useful for those languages.
  3. "Character" compares every character, including emoji — surrogate pairs and emoji are never split apart.

Ignore whitespace / case

"Ignore whitespace" treats pure whitespace differences as non-changes; "ignore case" treats text differing only in case as identical; "trim lines" strips leading/trailing whitespace from every line before comparing. CRLF and LF line endings are always normalized automatically.

Common use cases

  1. Comparing two versions of code, a config file, or a document.
  2. Checking what changed between drafts of a translation or edit.

All comparison happens locally in your browser — the text you enter is never uploaded or sent anywhere.

How to use?

  1. Paste the text you want to compare into the "Original" and "Changed" fields.
  2. Choose a precision (line/word/character) and view mode, and check any of the ignore-whitespace/case/trim options you need.
  3. Short input compares automatically as you type; for longer input, click "Compare".

Frequently asked questions

Does character mode ever split an emoji apart?

No. Character mode tokenizes with a Unicode-aware method (Intl.Segmenter, falling back to a code-point-safe method where unavailable) — a surrogate pair or emoji is never split into two broken characters.

Are CRLF and LF line endings treated as a difference?

No — both are normalized before comparing, so Windows (CRLF) and Unix (LF) formatted text is never mistakenly flagged as different on every line.

What happens if I paste very long text?

Above a safety threshold, live auto-compare is disabled and you're asked to click "Compare" manually; above a hard limit, the tool refuses to compare and shows a clear message, to avoid freezing the browser tab.

CRLF and LF line endings are automatically normalized before comparing. All comparison happens locally in your browser — nothing is uploaded or sent anywhere.