Text Diff - Free Online Tool | PivaBox

Compare two texts side by side and highlight differences

Text Diff Checker — Compare Two Texts and Find Differences Instantly

  1. Paste the original text in the left panel and the modified text in the right panel. The tool handles any text — code, prose, configuration files, legal documents, or data exports. Large texts up to several megabytes are processed efficiently.
  2. The diff algorithm compares both texts line by line and word by word, highlighting additions in green, deletions in red, and modifications with inline change markers. The side-by-side view makes it easy to spot exactly what changed.
  3. Review the highlighted differences, navigate between changes, and copy the diff output. Use it for code reviews, document versioning, plagiarism checking, or verifying edits before committing changes.

Frequently Asked Questions

Is the Text Diff Checker free?

Yes, completely free with no text size limits. Compare documents of any length — from short paragraphs to full-length manuscripts.

Are my texts uploaded to any server?

No. All comparison is performed locally in your browser. Your documents remain private — essential for confidential contracts, proprietary source code, legal filings, and personal writing.

How does text diffing work and what are common use cases?

Text diffing uses the Longest Common Subsequence (LCS) algorithm to find the minimal set of changes between two versions of text. Common uses: (1) Code review — compare a developer's changes against the original file before merging. (2) Document versioning — track changes between contract revisions, policy updates, or article drafts. (3) Plagiarism detection — compare student submissions or article drafts against originals. (4) Configuration management — verify what changed between server config versions. (5) Data validation — compare CSV exports or log files from different runs to identify anomalies. The unified diff view (additions in green, deletions in red) is the same format used by Git and most version control systems, making it familiar to developers.