How does the diff algorithm work?

The tool performs line-by-line comparison. It compares each line at the same position in both texts, marking lines as added, removed, or unchanged.

Can I hide unchanged lines?

Yes. Toggle Show Unchanged Lines off to see only the differences, making it easier to focus on what changed in long documents.

What do the colors mean?

Green lines with a + prefix are additions (in modified but not original). Red lines with a - prefix are deletions (in original but not modified). Grey lines are unchanged.

Is there a size limit for text comparison?

No strict limit. Very large texts may take a moment to process but the comparison happens entirely in your browser.

How does the diff algorithm work?

The tool performs line-by-line comparison. It compares each line at the same position in both texts, marking lines as added, removed, or unchanged.

Can I hide unchanged lines?

Yes. Toggle Show Unchanged Lines off to see only the differences, making it easier to focus on what changed in long documents.

What do the colors mean?

Green lines with a + prefix are additions (in modified but not original). Red lines with a - prefix are deletions (in original but not modified). Grey lines are unchanged.

Is there a size limit for text comparison?

No strict limit. Very large texts may take a moment to process but the comparison happens entirely in your browser.

Text Diff Checker — Compare Two Texts Online

How to Use

1

Enter original text

Paste the original version of your text in the left text area.

2

Enter modified text

Paste the updated or modified version in the right text area.

3

View the differences

Added lines are highlighted in green, removed lines in red, and unchanged lines in grey.

4

Use the swap button

Click Swap to exchange original and modified text if you need to reverse the comparison.

About This Tool

Free Online Text Diff Checker Tool

The Versatools Text Diff Checker is a powerful utility designed to check difference between two texts side by side. It highlights every modification, making it an essential tool for writers tracking revisions, developers reviewing code changes, and anyone who needs to identify exactly what changed between two versions of a document.

How Text Diffing Works

Our tool simplifies the process to show differences between two texts through a precise line-by-line comparison. Lines that exist in the modified version but not the original are highlighted in green as added content. Conversely, lines from the original that are missing in the modified version appear in red. Any lines that remain identical are shown in grey, allowing you to quickly spot difference in text without manual scanning.

Common Use Cases

Writers use diff checkers to compare drafts and track editing changes over time. Developers rely on them to review code logic before committing changes. Students can check difference between two texts to compare their work against a reference, while legal professionals use text comparison to identify subtle changes between contract versions. Our tool provides clear visual differentiation so you can immediately spot difference in text and verify that only intended changes were made.