Can I compare code files with this diff tool?

Yes. The tool works on any plain text, including source code in any language. Paste JavaScript, Python, JSON, YAML, SQL, or any other text-based content and differences are highlighted immediately.

Does it show character-level differences?

Yes. In addition to highlighting changed lines, the tool highlights the specific characters or words within a line that changed, making it easy to spot minor edits like renamed variables or changed values.

Is there a limit on how much text I can compare?

There is no hard limit, but very large texts (tens of thousands of lines) may take a moment to process since the diff runs in your browser. For most developer use cases, the comparison is instant.

Can I ignore whitespace differences?

Yes. Toggle the 'Ignore whitespace' option to exclude indentation and spacing changes from the diff, which is helpful when comparing reformatted code where only logic changed.

Is my text kept private?

Completely. Both text panels are processed entirely in your browser. Nothing you paste is uploaded or stored anywhere. This makes the tool safe for proprietary code, legal documents, or any sensitive content.

All Tools›Data & Text›

Text Diff

Free · No Server

Compare two texts side-by-side or inline — highlights added, removed, and changed lines.

Original Text

Drag & drop a file, upload, or paste directly

Modified Text

Drag & drop a file, upload, or paste directly

What is Text Diff?

The Text Diff Checker on AiTechWorlds is a browser-based tool for comparing two pieces of text, code, or configuration side by side and instantly highlighting every addition, deletion, and unchanged line. Developers use it to review changes between config file versions, compare API response payloads, audit copy edits, or verify that a refactored function produces the same output as the original. The diff engine highlights changes at both the line level and the character level, so you can see exactly which word or character changed. All comparison happens in your browser — neither text block is sent to any server, making this tool safe for proprietary code or private content. AiTechWorlds provides this tool as a fast alternative to opening a code editor just to compare two snippets.

How to Use

1
Paste original text
Enter the original or 'before' version into the left panel.
2
Paste modified text
Enter the updated or 'after' version into the right panel.
3
View the diff
Differences are highlighted automatically: green for additions, red for deletions, and neutral for unchanged lines.
4
Toggle diff modes
Switch between side-by-side and unified diff views depending on your preference.
5
Copy or share
Copy the diff output or share the result for code review discussions.

Common Use Cases

Developers comparing two versions of a configuration file after an environment change
Code reviewers checking what changed between two function implementations
Technical writers diffing two versions of documentation before publishing
QA engineers comparing expected vs actual API response bodies
DevOps engineers auditing changes between two Dockerfile or YAML versions

Key Features

Line-level and character-level diff highlighting
Side-by-side and unified diff views
Handles large text blocks efficiently
Ignores whitespace option for cleaner diffs
Syntax-aware coloring for common languages
100% browser-based — no server, no upload
Copy diff output to clipboard

🔒

100% Private — No Server Required

All processing happens directly in your browser. No data is uploaded, stored, or transmitted to any server.

Frequently Asked Questions

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AiTechWorlds

What is Text Diff?

How to Use

Paste original text

Enter the original or 'before' version into the left panel.

Paste modified text

Enter the updated or 'after' version into the right panel.

View the diff

Differences are highlighted automatically: green for additions, red for deletions, and neutral for unchanged lines.

Toggle diff modes

Switch between side-by-side and unified diff views depending on your preference.

Copy or share

Copy the diff output or share the result for code review discussions.

Common Use Cases

Developers comparing two versions of a configuration file after an environment change

Code reviewers checking what changed between two function implementations

Technical writers diffing two versions of documentation before publishing

QA engineers comparing expected vs actual API response bodies

DevOps engineers auditing changes between two Dockerfile or YAML versions