Are UtiliTools really 100% free?

Yes, all 115+ tools on UtiliTools are completely free with no hidden costs, no premium plans, and no usage limits. The site is supported by non-intrusive advertising.

Do I need to create an account or sign up?

No, UtiliTools requires no sign-up, no email, and no account. Just open any tool and start using it immediately.

Are my files safe? Do you upload them to a server?

Your files are 100% safe. Almost all UtiliTools process files directly in your browser using JavaScript and WebAssembly. Your files never leave your device and are never uploaded to any server.

What tools are available on UtiliTools?

UtiliTools offers 115+ tools across 6 categories: PDF tools (convert, compress), Image tools (convert, compress, resize), Video tools (convert, extract audio), Text tools (case converter, diff, markdown), Developer tools (JSON formatter, Base64, hash generator, regex tester, and more), and Utilities (QR codes, unit converter, password generator, timer).

Does UtiliTools work on mobile devices?

Yes, UtiliTools is fully responsive and works on smartphones, tablets, and desktops. All tools are optimized for touch interfaces and smaller screens.

How is UtiliTools different from other online tool websites?

Unlike most online tool websites, UtiliTools processes your files directly in your browser — no uploads, no server processing, no waiting. This means faster results and complete privacy. Plus, there are no file size limits or daily usage caps.

How does the code diff work?

UtiliTools Code Diff uses a Longest Common Subsequence (LCS) algorithm to compare two texts line by line. It identifies added, removed, and unchanged lines and displays them with color coding for easy visual comparison.

What is the difference between unified and side-by-side view?

Unified view shows all changes in a single column with + and - prefixes, similar to git diff output. Side-by-side view shows the original and modified code in parallel columns, making it easier to see exactly what changed on each line.

Can I ignore whitespace differences?

Yes, enable the Ignore Whitespace toggle to skip differences caused only by spaces, tabs, or trailing whitespace. This is useful when comparing code that has been reformatted but not functionally changed.

Can I ignore case differences?

Yes, enable the Ignore Case toggle to treat uppercase and lowercase letters as identical. This is helpful when comparing case-insensitive content like SQL queries or configuration values.

Is there a size limit?

There is no hard limit. The diff runs entirely in your browser, so performance depends on your device. It handles thousands of lines efficiently on modern hardware.

Yes, all diff computation happens locally in your browser. Your code is never uploaded to any server, making it safe for proprietary source code and sensitive content.

home/developer/code-diff

Code Diff

Compare two code snippets line by line with an LCS-based diff algorithm. Unified and side-by-side views.

Original

Modified

View:

Ignore whitespaceIgnore case

LCS-based Diff

Uses a Longest Common Subsequence algorithm to accurately detect additions, deletions, and unchanged lines between two code snippets.

Two View Modes

Switch between unified diff (like git diff) and side-by-side view for the comparison style that works best for your workflow.

Flexible Options

Ignore whitespace to focus on real changes, or ignore case for case-insensitive comparison. Copy the diff output for code reviews.

How to Use Code Diff

The Code Diff tool compares two code snippets using a Longest Common Subsequence algorithm to produce accurate line-by-line diffs. It offers unified and side-by-side views, ignore whitespace/case options, and detailed statistics. All processing runs in your browser.

Open the Code Diff Tool

Navigate to the Code Diff tool from the tools menu. The LCS-based diff algorithm runs entirely in your browser for complete privacy.

Paste the Original Code

Enter the original version of your code into the left text area. This serves as the baseline for comparison.

Paste the Modified Code

Enter the modified version into the right text area. The tool will identify every addition, deletion, and unchanged line between the two versions.

Configure Options

Toggle Ignore Whitespace to skip formatting-only changes, or Ignore Case for case-insensitive comparison. Choose between unified and side-by-side views.

Compare and Review

Click Compare to generate the diff. Review color-coded results showing additions in green, deletions in red, and unchanged lines in gray. Copy the diff output for documentation or code reviews.

Common Use Cases

Pull Request Review

Compare the before and after versions of a function or configuration to understand the impact of a proposed change before approving.

Debugging Regressions

Compare a working version of code against a broken version to quickly identify the exact lines that introduced a bug.

Migration Verification

Compare output from old and new systems, APIs, or code generators to verify that a migration preserved all expected behavior.

Configuration Auditing

Compare configuration files across environments (dev, staging, production) to catch unintended differences that could cause deployment issues.

Pro Tips

-Use Ignore Whitespace when comparing code that has been reformatted but not functionally changed to focus on real differences.
-Side-by-side view makes it easy to see exactly what changed on each line, especially for large files.
-Copy the unified diff output for pasting into pull request descriptions or code review comments.
-The stats summary gives a quick overview of how much changed without reading every line.

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