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Code Diff Viewer Online — Free Tool

Perform side-by-side textual comparisons to easily spot differences between two versions of code or text.

Inputs
Paste two versions to compare. Diff runs locally in your browser.
+2-1
Diff
1
line 1
2
-
line 2
3
line 3
4
1
line 1
2
+
line two
3
line 3
4
+
line 4
5
Note: This is a fast line-based diff intended for tool usage. For semantic diffs, we can add an advanced mode later.
Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

Code Diff Viewer helps developers perform side-by-side textual comparisons to easily spot differences between two versions of code or text. Paste your payload or source text, run the tool, and copy the output into your editor, API client, or terminal.

Everything runs locally in the browser, which keeps tokens, queries, and proprietary data off third-party servers.

How to use

  1. Paste or type your input in the tool panel above.
  2. Choose formatting or conversion options if available.
  3. Copy the output for use in your document or project.

This page is available at /tools/code-diff-viewer/.

Related keywords

  • diff viewer
  • code diff
  • text diff
  • compare text
  • side by side diff

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FAQ

What is Code Diff Viewer?

Code Diff Viewer is an online developer tool that perform side-by-side textual comparisons to easily spot differences between two versions of code or text.

How do I use the Code Diff Viewer?

Paste your code, JSON, token, or query into the editor, run the tool, and copy the formatted or converted result into your project.

Is this tool free?

Yes—this tool is free to use with no account required.

Does it run locally in the browser?

Yes. Calculations and transformations run in your browser—your input stays on your device.