Text Diff Checker – Compare Two Texts Instantly

Paste two versions of any text and instantly see what changed. Additions are highlighted in green, deletions in red, and unchanged lines remain neutral. All processing happens in your browser — nothing is uploaded or stored.

Input Texts

Diff Result

Diff results will appear here.

Why Use the Tools Oasis Text Diff Checker?

Tools Oasis provides a clean, fast way to compare any two blocks of text and spot every difference. Whether you're reviewing code changes, comparing document drafts, or verifying data updates, our diff tool highlights exactly what was added, removed, or kept the same.

  • Color-Coded Results: Green for additions, red for deletions — differences are instantly visible.
  • 100% Private: All comparisons happen locally in your browser. Your text is never sent anywhere.
  • Instant Comparison: Results appear immediately with no loading or processing delay.
  • Developer Friendly: Perfect for code reviews, config file comparisons, and changelog verification.

How to Compare Text Online

Using the diff checker is simple: paste your original text in the first field (A) and the modified version in the second field (B). Click Compare Texts and the tool will perform a line-by-line comparison, clearly marking every change. You can also swap the inputs or copy the diff output for sharing.

Related Tools You Might Need

Frequently Asked Questions

How does the text diff comparison work?

The tool performs a line-by-line comparison of both texts. Lines present only in the original (A) are marked as deletions (red), lines present only in the modified text (B) are marked as additions (green), and matching lines remain neutral. It uses a longest common subsequence algorithm for accurate results.

Is my text uploaded to a server?

No. All processing is done entirely in your browser using JavaScript. Tools Oasis never sends, stores, or logs any of your text. Your data stays 100% on your device.

Can I compare code with this tool?

Absolutely. This diff checker works great for comparing code snippets, configuration files, SQL queries, JSON data, and any other text-based content. It performs a clean line-by-line diff that developers rely on.

What do the colors mean in the diff output?

Green lines represent additions (text that exists in B but not in A). Red lines represent deletions (text that exists in A but not in B). Unmarked lines are identical in both texts.

Is there a size limit for the texts?

There's no hard limit, but very large texts (over 50,000 lines) may be slower because everything runs in your browser. For typical use cases — documents, code files, configs — performance is instant.

Can I swap the two inputs?

Yes. Click the Swap A ↔ B button to instantly switch the original and modified texts. This is useful for reversing the perspective of your diff.

More Questions About Text Comparison

What is a diff tool?

A diff tool compares two versions of text and highlights the differences between them. Lines added in the new version appear in green, deleted lines appear in red, and unchanged lines remain neutral. It is essential for code reviews, document editing, and version tracking.

Can I compare code with this tool?

Absolutely. This diff checker performs clean line-by-line comparisons that work great for code snippets, configuration files, SQL queries, JSON data, and any other text-based content developers work with daily.

Does the diff output show line numbers?

Yes. Each line in the diff output includes a line number reference so you can easily locate changes in the original or modified text. This makes it straightforward to communicate specific changes to teammates.

Is my data stored or sent to a server?

No. All comparison processing happens entirely in your browser using JavaScript. Tools Oasis never sends, stores, or logs any of your text. Your data stays 100% on your device.