How does the diff checker identify changes at the word level?

The tool breaks both texts into words and uses the Longest Common Subsequence (LCS) algorithm to find the optimal alignment between them. This identifies which words are unchanged, which are added, and which are removed. The result highlights only the specific words that differ, rather than entire lines or sentences.

Can I compare texts that are in different formats?

The diff checker compares plain text, so any formatting differences in rich text (like fonts, colors, or styles) are not compared. If you paste formatted text, only the text content is compared. For best results, paste plain text without formatting. You can use 'Paste as plain text' to strip formatting before comparing.

Is there a limit on the text length I can compare?

The tool handles texts of any reasonable length, from a few sentences to full-length documents. Very large texts (over 100,000 characters) may take a few seconds to process. The comparison is performed entirely in your browser, so processing time depends on your device's performance.

How is this different from using Git diff?

Git diff is a command-line tool for comparing code versions in a Git repository. Our tool is a browser-based comparison that works with any text without requiring Git or a repository. It is more accessible for non-technical users and does not require any software installation. However, Git diff offers more advanced features for version control workflows.

Can I ignore whitespace differences in the comparison?

Yes, the tool offers an option to ignore whitespace differences, which is useful when you only care about content changes and not formatting differences like extra spaces or line breaks. This is particularly helpful when comparing code or data where whitespace normalization is expected.

What does the diff summary tell me?

The summary shows the total number of additions, deletions, and modifications found between the two texts. It also shows the percentage of text that changed. This gives you a quick overview of how significantly the two versions differ, which is useful for assessing the scope of edits at a glance.

Loading tool...

Text Diff Checker

Spotting differences between two versions of text shouldn't require squinting at every line. Our text diff checker online free tool compares your texts side by side and highlights every addition, deletion, and modification in color. See exactly what changed — instantly and accurately.

100% FreeNo Signup RequiredBrowser-BasedPrivate & Secure

What is Text Diff Checker?

A text diff checker is a comparison tool that identifies and highlights differences between two versions of text, showing additions, deletions, and modifications with color-coded visual indicators.

Complementary Tools

These tools work great alongside Text Diff Checker:

Word Counter Character Counter

Start Using Text Diff Checker Today

Comparing texts side by side is tedious and error-prone. Our free text diff tool highlights every addition, deletion, and modification with color-coded precision — at the word or character level — so you can review changes in seconds instead of hours, all while keeping your data completely private.

Use Text Diff Checker Free

Table of Contents