Text Diff – Free Online Text Comparison Tool

Compare two texts and see differences highlighted. Character-level and line-level diff views. Side-by-side or unified view.

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Features

📝

Character-Level Diff

See exactly which characters were changed, added, or removed with inline highlighting.

📄

Line-Level Diff

View differences at the line level for easier navigation in larger documents.

↔️

Side-by-Side View

View original and modified text in two columns for easy comparison.

📋

Unified View

View differences in a single column with added/removed markers — perfect for generating patches.

⚙️

Ignore Options

Toggle ignoring leading/trailing whitespace, all whitespace, or case differences.

📊

Similarity Score

See a percentage similarity score between the two texts.

How to Use

1

Paste Original

Paste the original text into the left panel.

2

Paste Modified

Paste the modified text into the right panel.

3

Choose View

Select side-by-side or unified view. Toggle character-level or line-level diff.

4

Copy Unified Diff

Copy the result as a unified diff/patch format if needed.

Frequently Asked Questions

What is a text diff?
A text diff (or text comparison) shows the differences between two versions of text. It highlights what was changed, added, or removed.
What's the difference between character-level and line-level diff?
Character-level diff shows exactly which characters changed within a line. Line-level diff shows which lines were added, removed, or modified — more useful for large documents.
What is a unified diff?
A unified diff (or patch) is a format that combines both texts into one view with + for added lines and - for removed lines. It's the standard format for sharing code changes.
Can I ignore whitespace when comparing?
Yes. Options include: ignore leading/trailing whitespace, ignore all whitespace changes, or ignore case differences.
Is my data sent to a server?
No. All diff computation is done locally in the browser using JavaScript. Your texts never leave your device.

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