Diff Viewer
Developer ToolsCompare two text or code blocks with side-by-side and unified diff views, syntax highlighting, and line-level change highlighting online.
+7 added−6 removed4 unchanged
Original (A)
Modified (B)
Diff Result
Original (A)
Modified (B)
1−function greet(name) {
1+function greet(name, greeting = "Hello") {
2− console.log("Hello, " + name + "!");
2+ console.log(greeting + ", " + name + "!");
3− return true;
3+ return greeting.length > 0;
4 }
4 }
5
5
6 const config = {
6 const config = {
7− debug: false,
7+ debug: true,
8− timeout: 5000,
8+ timeout: 8000,
9− retries: 3,
9+ retries: 5,
10+ verbose: true,
10 };
11 };
About Diff Viewer
The Diff Viewer lets you instantly compare two texts, code snippets, or configuration files side-by-side or in unified format. Paste your original and modified content to see exactly which lines were added, removed, or changed — with color-coded highlighting for at-a-glance clarity. Whether you're reviewing a code change, comparing config files, or checking a document revision, the diff viewer makes it easy to spot every difference without a local tool.
Features
- ✓Side-by-side and unified diff display modes
- ✓Line-level addition, deletion, and modification highlighting
- ✓Syntax highlighting for popular languages
- ✓Character-level inline diff within changed lines
- ✓Line number display for easy reference
- ✓Copy diff output as plain text or unified patch format
- ✓Ignore whitespace and case-insensitive comparison options
- ✓Diff statistics: lines added, removed, and unchanged
Common Use Cases
- Reviewing code changes before committing to version control
- Comparing two versions of a configuration file
- Checking differences between API response payloads
- Validating template output against an expected result
- Proofreading document revisions side-by-side
- Auditing infrastructure-as-code changes
Frequently Asked Questions
QWhat diff algorithm does this tool use?
The viewer uses the Myers diff algorithm, the same algorithm used by Git, which produces minimal and human-readable diffs.
QCan I compare binary files?
The tool is designed for text-based content. Binary files such as images or compiled executables are not supported.
QDoes the tool support unified patch format output?
Yes, you can copy the result as a standard unified diff (--- / +++ / @@ format) suitable for use with patch or git apply.
QIs my content sent to a server?
No. All diffing is performed entirely in your browser. Your text never leaves your device.