Text Comparator
Compare two texts and highlight differences
How to use Text Comparator
Compare two texts and highlight differences side by side. Word and character level diff. Free online text comparison tool.
What is a text comparator used for?
Comparing two versions of a text to identify differences is essential in software development, legal document review, academic editing, and translation verification.
- Code review: Compare two versions of a function or configuration file to see exactly what changed — added lines in green, removed lines in red.
- Document versioning: Editors compare draft versions of contracts, articles or reports to track changes without using track-changes mode in Word.
- Translation verification: Compare source and translated text paragraph by paragraph to ensure nothing was omitted.
- Data validation: Compare two exports of the same dataset to find discrepancies — missing records, changed values.
- Plagiarism detection: Compare a student submission with a reference text to identify copied passages.
How diff works: The comparison algorithm (based on the longest common subsequence) finds the minimum number of changes needed to transform one text into the other. Lines present in text A but not B are marked as deleted; lines in B but not A are marked as added.
Frequently Asked Questions
What is the difference between character-level and line-level diff?
Line-level diff compares entire lines — a line is either present, absent, or changed. Character-level diff goes further and highlights the specific characters that changed within a line, making it easier to spot small edits like typos or number changes.
Can I compare two files instead of pasting text?
This tool works with pasted text. For file-based comparison, tools like Visual Studio Code's built-in diff, KDiff3, or WinMerge are more appropriate — they can handle large files and entire directory trees.
Is whitespace included in the comparison?
By default yes — extra spaces, tabs and newlines are significant. Most diff tools offer a 'ignore whitespace' option for cases where formatting differences are not relevant, such as comparing code that was reformatted.
What does 'unified diff' mean?
Unified diff format (used by Git) shows changed lines together with a few lines of context, prefixed with + (added) or - (removed). It is compact and the standard format for code patches and pull requests.
Can I use this to detect plagiarism?
It can identify identical or near-identical passages between two specific texts. For broader plagiarism detection across the internet, dedicated tools like Turnitin, Copyscape or Grammarly's plagiarism checker are more appropriate.
Text comparator vs Git diff vs Word track changes
Git diff is the standard for code — it tracks changes across commits and branches, with full history. Word track changes records edits inline with author and timestamp — ideal for collaborative document editing. Google Docs version history shows paragraph-level changes over time. A browser diff tool like this one is ideal for quick, one-off comparisons of any text without needing Git, Word or any installed software.