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Text Tool · Client-Side · Instant Compare

Diff
Checker

Compare two texts and find differences instantly. See additions, deletions, and changes highlighted. Side-by-side or inline view with line numbers.

⇄ Compare ✓ Client-Side Line · Char · Word Free Forever
// view modes
2
Side-by-side, Inline
// diff types
3
Line, Word, Character
// total uses
253
100% in browser
diff_checker.js LIVE
Original Text A
Modified Text B
Output
Diff Result
Added
Removed
Unchanged
⇄
Enter text in both fields and click "Compare Texts" to see differences
§ Docs
How to Use
Paste Your Texts
Enter or paste the original text in the left panel (Text A) and the modified version in the right panel (Text B). You can also use the "Paste" buttons for quick clipboard access.
Configure Options
Toggle options like Ignore Whitespace or Ignore Case for flexible comparison. Choose between Line, Word, or Character-level diff modes.
Compare
Click the Compare Texts button to analyze differences. Results appear instantly with color-coded highlighting — green for additions, red for deletions.
Review & Export
Switch between Side-by-Side and Inline views. Copy the diff output or download it as a file for documentation or code review purposes.
⊞ Reference
Diff Granularity & View Modes Comparison
Diff Mode Granularity Highlight Behavior Best For
Line Diff Per-line Entire modified lines highlighted Source code, Git commits, configuration files
Word Diff Whitespace-separated words Specific changed words within lines Articles, blog posts, contract revisions
Character Diff Individual characters Exact single-letter and symbol changes Hashes, UUIDs, typos, punctuation tweaks
</> Code
How to Generate Diffs in Code
⚡ Node.js (diff package)
const Diff = require('diff');

const diff = Diff.diffLines(oldText, newText);
diff.forEach(part => {
  const color = part.added ? 'green' : part.removed ? 'red' : 'grey';
  console.log(part.value[color]);
});
🐍 Python 3 (difflib)
import difflib

# Unified diff lines
diff = difflib.unified_diff(
    text1.splitlines(),
    text2.splitlines(),
    lineterm=''
)
print('\n'.join(diff))
💻 Linux / Git CLI
# Compare two files
diff -u fileA.txt fileB.txt

# Word diff with Git
git diff --word-diff fileA.txt fileB.txt
? FAQ
Frequently Asked Questions
A diff checker (or diff tool) compares two pieces of text and identifies the differences between them. It shows what was added, removed, or changed, making it easy to track modifications in code, documents, or any text content.
Line diff compares entire lines — if anything changes on a line, the whole line is marked. Word diff highlights individual words that changed within lines. Character diff shows the exact characters that were added or removed, useful for spotting typos or small changes.
When enabled, the tool ignores differences in leading/trailing spaces and treats multiple spaces as equivalent. This is useful for comparing code where indentation might differ, or when formatting changes shouldn't be flagged as meaningful differences.
Absolutely! This diff checker is perfect for comparing code, configuration files, JSON, HTML, or any text-based content. The syntax highlighting and line numbers make it easy to navigate and understand code changes.
Yes, completely. All comparison happens locally in your browser using JavaScript. Your text is never sent to any server. You can even disconnect from the internet after loading the page and the tool will continue to work.