What is Modern Text Diff Checker?

A Text Diff Checker is a utility that compares two blocks of text and highlights the differences between them. It is widely used by developers to compare code versions, writers to track changes in drafts, and legal professionals to review contract revisions. This tool uses a 'diff' algorithm to identify lines that have been added, removed, or modified. It presents the comparison in a side-by-side or inline view, using color-coding (typically green for additions and red for deletions) to make the changes instantly visible. Our tool processes the text locally in your browser, ensuring that your sensitive code or documents are never uploaded to a server.

Input Formats

Original Text (Left)
Modified Text (Right)
Code snippets
JSON/XML/YAML

Output Results

Highlighted differences
Line numbers
Diff statistics (lines added/removed)

Key Features

Visual Comparison: Instantly spot differences with color-coded highlighting

Side-by-Side View: Compare texts in a clear, split-pane layout

Privacy: 100% Client-side processing; sensitive docs stay private

Multi-Format: Works perfectly with code, JSON, XML, or plain text

Line Numbers: Quickly reference specific changes by line

Diff Stats: See the total number of additions and deletions

Developer Tool: Essential for reviewing code snippets or config files

Advanced & Secure: The most advanced secure text diff checker for developers

Shareable LinksShare the comparison result via a link. (Limit: 10KB)

Who is this for?

Code Review

Developers comparing two versions of a file to see what changed before committing.

Git diffCode compareVersion control

Content Editing

Writers comparing an original draft with an edited version to accept or reject changes.

Draft comparisonEditingRevision tracking

Data Validation

Comparing two JSON responses or configuration files to spot discrepancies.

Config compareJSON diffData verification

How to Use

Paste the original text in the left panel.

Paste the modified text in the right panel.

The tool will automatically highlight the differences.

Scroll to view all changes.

Examples

Input

Left: Hello World
Right: Hello Python

Output

[Visual Diff showing 'World' removed and 'Python' added]

Frequently Asked Questions

Is my data secure?

Yes. I compare everything right here in your browser. Nothing is sent to a server, so your code and documents are safe.

Does it support code syntax highlighting?

I focus on highlighting the *differences* first. Syntax highlighting is coming soon!

Can I compare files?

Just copy and paste the text from your files. I'll handle thousands of lines without breaking a sweat.

Is there a limit on text size?

I can handle very large files. If your browser can handle the copy-paste, I can handle the diff.

Does it ignore whitespace?

I show every difference, including spaces, because sometimes a space makes a big difference in code.

Can I share the results?

Yes! Click 'Share' to get a link. Just remember, the link contains the text, so don't share sensitive passwords.

Does it work offline?

Yes. Once you're here, you don't need the internet to compare text.

What algorithm does it use?

I use the Myers diff algorithm. It's the industry standard for finding the shortest set of changes.

What is Modern Text Diff Checker?

Key Features

Visual Comparison: Instantly spot differences with color-coded highlighting

Side-by-Side View: Compare texts in a clear, split-pane layout

Privacy: 100% Client-side processing; sensitive docs stay private

Multi-Format: Works perfectly with code, JSON, XML, or plain text

Line Numbers: Quickly reference specific changes by line

Diff Stats: See the total number of additions and deletions

Developer Tool: Essential for reviewing code snippets or config files

Advanced & Secure: The most advanced secure text diff checker for developers

Shareable LinksShare the comparison result via a link. (Limit: 10KB)

Who is this for?

Code Review

Developers comparing two versions of a file to see what changed before committing.

Git diffCode compareVersion control

Content Editing

Writers comparing an original draft with an edited version to accept or reject changes.

Draft comparisonEditingRevision tracking

Data Validation

Comparing two JSON responses or configuration files to spot discrepancies.

Config compareJSON diffData verification

Frequently Asked Questions

Is my data secure?

Yes. I compare everything right here in your browser. Nothing is sent to a server, so your code and documents are safe.

Does it support code syntax highlighting?

I focus on highlighting the *differences* first. Syntax highlighting is coming soon!

Can I compare files?

Just copy and paste the text from your files. I'll handle thousands of lines without breaking a sweat.

Is there a limit on text size?

I can handle very large files. If your browser can handle the copy-paste, I can handle the diff.

Does it ignore whitespace?

I show every difference, including spaces, because sometimes a space makes a big difference in code.

Can I share the results?

Yes! Click 'Share' to get a link. Just remember, the link contains the text, so don't share sensitive passwords.

Does it work offline?

Yes. Once you're here, you don't need the internet to compare text.

What algorithm does it use?

I use the Myers diff algorithm. It's the industry standard for finding the shortest set of changes.

Online Text Diff Checker — Compare Two Texts

What is Modern Text Diff Checker?

Input Formats

Output Results

Key Features

Who is this for?

Code Review

Content Editing

Data Validation

How to Use

Examples

Input

Output

Frequently Asked Questions

Online Text Diff Checker — Compare Two Texts

What is Modern Text Diff Checker?

Input Formats

Output Results

Key Features

Who is this for?

Code Review

Content Editing

Data Validation

How to Use

Examples

Input

Output

Frequently Asked Questions