Does this tool upload or store my texts?

No. Comparison happens in your browser. Only comparison options are saved; pasted text, loaded documents and patches are not persisted.

Do ignore options remove changes from the exported patch?

No. Ignore options affect the comparison view and its summary. The patch transforms the exact original text into the exact changed text and includes all differences.

How large can the inputs be?

Each input supports up to 5,000,000 UTF-16 units and 100,000 lines. Word and character modes allow 300,000 tokens per input. Very different inputs can reach a time or edit limit; previews cap rows and line length while patches retain all text.

ToolHub

Diff Checker

Compare two texts by line, word or character, review highlighted differences and export an exact unified diff patch in your browser.

Stable

Online

Original text

0 characters

Changed text

0 characters

Line endings remain significant. Word mode counts words, punctuation and whitespace tokens; character mode counts graphemes where supported. Changed lines show word highlights, or character highlights in character mode.

Enter or load text on either side, then compare.

Paste or load original and changed text to compare them locally. Choose line, word or character comparison, filter case and whitespace differences, and review numbered side-by-side or unified results. Unchanged regions collapse to the chosen context and long previews are capped. Large inputs use an explicit comparison and a cancellable local worker. Export a unified patch that retains all changes in the exact input texts, including differences hidden by filters. Text is never uploaded or saved.

Line, word-token and grapheme character comparisons
Case, edge whitespace, within-line whitespace and blank-line filters
Numbered side-by-side and unified views with text markers
Intra-line highlights and collapsible unchanged regions
Addition, deletion, unchanged and similarity summaries
Copy and download exact unified diff patches