ToolHorizon

Text Comparison / Diff Checker

๐ŸŽจ How Differences Are Highlighted
Understanding the color coding in diff results
Green โ€” Added text (new in version 2)
Red โ€” Deleted text (removed from version 1)
Yellow โ€” Modified lines (changed content)

Unchanged lines appear in plain white/grey. The diff can be viewed side-by-side or as a single unified inline view depending on your preference.

๐Ÿš€ How to Use
Compare any two texts in seconds
1

Paste Original Text (Left Box)

Enter or paste the original version of your text into the left input box. This is your baseline โ€” the "before" version.

2

Paste Modified Text (Right Box)

Enter or paste the new/edited version of your text into the right input box. This is the "after" version you want to compare against.

3

Click "Compare"

Hit the Compare button and the tool will instantly highlight all differences โ€” additions in green, deletions in red, and modifications in yellow.

4

Review & Export

Browse the diff results line by line. You can switch between side-by-side and inline view, or download the diff report as a text file.

๐Ÿ’ก Use Cases
Who benefits from the diff checker most
๐Ÿ’ป

Developers

Compare code snippets before and after edits without using Git.

๐Ÿ“„

Document Review

Find what changed between two drafts of a contract, policy, or report.

๐ŸŽ“

Teachers

Compare a student's work against the original to check plagiarism or edits.

โœ๏ธ

Editors

Review writer revisions and quickly approve or request further changes.

โš–๏ธ

Legal Teams

Track exactly which clauses changed between contract versions.

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Translators

Compare original source text and translated text for accuracy.

โœจ Pro Tips
Get cleaner, more useful diff results
๐Ÿงน

Clean Before Comparing

Run both texts through the Text Formatting tool first to normalize casing and spacing so trivial differences don't clutter your diff.

๐Ÿ’ก

Line-by-Line Mode

For code or structured documents, use line-by-line mode. For prose, inline word-level diff is easier to read.

๐Ÿ“‘

Compare Versions

Great for comparing v1 and v2 of API documentation, terms of service updates, or employee handbook revisions.

๐Ÿ”

Ignore Whitespace

Enable "ignore whitespace" mode if you only want to see content changes, not formatting/indentation differences.

โ“ Frequently Asked Questions
Everything you want to know about the Diff Checker
What does "diff" mean? +
Diff is short for "difference." A diff checker compares two texts and shows the exact differences โ€” what was added, removed, or changed. The term comes from the Unix "diff" command used by developers to compare code files.
Can I compare code files, not just plain text? +
Yes! The diff checker works with any text-based content โ€” plain text, code (HTML, CSS, JavaScript, Python, etc.), JSON, XML, Markdown, CSV, and more. Just paste the content and compare.
Is the comparison case-sensitive? +
By default, yes โ€” "Hello" and "hello" are treated as different. Many diff tools offer a "case-insensitive" toggle if you want to ignore capitalization differences.
Can I compare very long documents? +
Yes, the tool handles large documents well. Thousands of lines can be compared. Performance depends on your device's browser, but modern devices handle large diffs smoothly.
Is my text sent to a server? +
No. All comparison happens in your browser locally. Neither of your texts is transmitted to or stored on any server. This makes it safe for comparing confidential contracts, private code, or sensitive documents.
What's the difference between side-by-side and unified (inline) view? +
Side-by-side shows both texts next to each other with differences highlighted in corresponding lines โ€” great for documents. Unified/inline view shows a single stream of text with insertions and deletions interleaved โ€” easier for prose review.
Can I use this to detect plagiarism? +
Yes, it's an effective way to compare a student's submission against a source text and identify exact copied passages. However, it only compares two specific texts โ€” for wider plagiarism detection across the internet, a dedicated plagiarism tool may be more appropriate.
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