Text Diff Tool
Compare two texts side by side and highlight additions, deletions, and changes line by line.
How to read the diff
Comparison is position-based, not aligned
Line 5 in the original is compared against line 5 in the modified text. If you insert a new line near the top, every line after it will show as changed — even if the content only shifted down.
Best for texts that grow in place
Works cleanest when you're editing an existing line (fixing a typo, changing a value) rather than inserting or deleting whole lines.
For code with inserted/deleted lines, use git diff
Git's diff algorithm aligns matching lines even when content shifts position. This tool is best for quick side-by-side text checks, not as a replacement for source control diffing.
How it works
Paste Texts
Copy your original text into the first box and modified text into the second box.
Compare
Click "Compare Texts" to analyze differences line by line.
Review Changes
See highlighted additions (green), deletions (red), and unchanged lines.
Common use cases
Code Review
Compare code versions to see what changed between commits or revisions.
Document Editing
Track changes between document versions to see edits and revisions.
Content Comparison
Compare two articles, contracts, or agreements to identify differences.
Translation Review
Compare original and translated text to ensure accuracy and completeness.
Frequently asked questions
Is my text data stored or sent to a server?
No. All text comparison happens entirely in your browser using JavaScript. Your data never leaves your computer, ensuring complete privacy and security.
How does the diff tool work?
The tool compares texts line by line and highlights additions (green), deletions (red), and unchanged lines (gray).
Can it compare large texts?
Yes, this tool can compare texts with thousands of lines. Very large files may take a moment to process.
Does it show character-level differences?
This tool shows line-level differences. For character-level comparison, consider breaking text into smaller chunks.
Can I use this tool offline?
Yes, once the page loads, the tool works completely offline since all processing happens in your browser.
What file formats are supported?
This tool works with plain text. For comparing code files, paste the code content directly into the text boxes.