Original text

Updated text

Paste text here, or DRAG AND DROP a text / spreadsheet file here
Each line is compared for differences with results shown below

🔒 IMPORTANT: Your data is secure! This tool runs entirely in your local browser, and no information is ever sent to the internet.

Lines are compared characTER by character

Lines replaced are detected



Common line example 1
Common line example 2
Common line example 3

Additional lines are marked green

Limits: 100,000 lines, 10 MB file size, and 100,000 characters per line.

Compare Text and Find Differences Online

Welcome to the fastest and most secure way to compare text online. Whether you're a developer checking code changes, a writer reviewing edits, or a student verifying documents, our free text diff checker instantly highlights additions, deletions, and modifications. Just paste your original and updated content to compare text side by side securely in your browser.

What is a Text Diff Tool?

A text diff tool (short for text difference) is an essential utility that analyzes two pieces of text to find precisely what has changed. Instead of manually reading line by line, our online compare text tool automatically scans both versions. It highlights exact word and character differences, making it effortless to compare text and find differences in seconds.

How to Compare Text Files Online

Using our compare text app is incredibly simple:

Step 1: Copy your original text and paste it into the left panel.
Step 2: Paste your modified text into the right panel.
Step 3: The tool will instantly compare text and highlight differences using color-coded indicators. Green indicates additions, while red shows deletions.

Why Use Our Text Difference Checker?

Privacy First

Everything runs completely locally in your browser. When you compare text files here, your sensitive data is never sent to any server.

Lightning Fast

Our text diff online engine is optimized for large files, allowing you to instantly compare text differences without lag.

Detailed Accuracy

Switch between character, word, or line-level comparison to get the exact granularity you need for your text diffs.

Mobile Friendly

Need to compare text files online on the go? Our responsive design ensures the diff viewer works perfectly on phones and tablets.

Frequently Asked Questions

Is it safe to compare sensitive text files here?

Yes, absolutely. Our text diff tool operates 100% locally within your device's web browser. No data is ever transmitted, uploaded, or saved to any external servers.

Can I use this text difference checker for code?

Yes. While it's great for prose and documents, our tool is also highly effective as a code diff utility. It accurately highlights syntax and character-level changes across large blocks of code.

How to compare text in Excel?

To compare text in Excel, you can use the EXACT function (e.g., =EXACT(A1, B1)) for case-sensitive comparison, or a simple formula like =A1=B1. For larger datasets, you can use Conditional Formatting to highlight differences or the "Compare and Merge Workbooks" feature.

How to compare text in Notepad++?

In Notepad++, you can compare text by installing the "Compare" plugin. Go to Plugins > Plugins Admin, search for "Compare", and install it. Once installed, open the two files you want to compare and go to Plugins > Compare > Compare (or press Ctrl+Alt+C).

How to compare text in Word?

To compare text within a single Word document, you can use the "Track Changes" feature. To compare two different versions of the same document, go to the Review tab, click Compare, and select Compare.... Choose your original and revised documents to see the differences highlighted.

How to compare two Word documents?

Open Microsoft Word, go to the Review tab, and click the Compare button. Select Compare... from the dropdown. In the dialog box, choose the "Original document" and the "Revised document". Word will then create a new document showing all the differences between the two.

What is compare and contrast text?

Compare and contrast text is a method of analysis that identifies the similarities (comparing) and differences (contrasting) between two or more subjects, ideas, or pieces of writing. It helps readers understand the relationship between different items and provides a deeper insight into their unique characteristics.

How to compare text in Sublime Text?

In Sublime Text, you can compare files by selecting two files in the sidebar (hold Ctrl or Cmd while clicking), right-clicking one of them, and choosing Diff Files.... Alternatively, you can install the popular "FileDiffs" or "SublimeMerge" plugins via Package Control for more advanced comparison features.

1	-	Paste text here, or DRAG AND DROP a text or spreadsheet file here	1	+	Paste text here, or DRAG AND DROP a text / spreadsheet file here
2		Each line is compared for differences with results shown below	2		Each line is compared for differences with results shown below
3			3
4		🔒 IMPORTANT: Your data is secure! This tool runs entirely in your local browser, and no information is ever sent to the internet.	4		🔒 IMPORTANT: Your data is secure! This tool runs entirely in your local browser, and no information is ever sent to the internet.
5			5
6	-	Lines are compared character by character	6	+	Lines are compared characTER by character
7			7
8	-	Replaced lines are detected	8	+	Lines replaced are detected
9			9
10	-	And so are deleted lines
11	-
12		Common line example 1	10		Common line example 1
13		Common line example 2	11		Common line example 2
14		Common line example 3	12		Common line example 3
			13	+
			14	+	Additional lines are marked green