Original Text
Modified Text
About Text Diff Checking
A diff (short for "difference") compares two texts and highlights what changed between them. This is useful for proofreading, reviewing edits, comparing document versions, or verifying content changes. Unlike code-focused diff tools, this checker is optimised for plain text — paragraphs, articles, notes, and documents.
Complete Guide to Text Comparison
Free Online Text Diff Checker
Paste two versions of any text and instantly see every difference highlighted in colour. Added lines are shown in green and removed lines in red. Modified lines show word-level detail so you can pinpoint exactly what changed. No sign-up required and your data never leaves your browser.
How It Works
The tool uses a longest-common-subsequence (LCS) algorithm to compare lines from both texts. When it detects a removed line immediately followed by an added line, it runs a second word-level diff to show precisely which words were changed. The result is presented in either inline view or side-by-side view.
Text Diff vs Code Diff
While code diff tools are designed for programming languages with syntax highlighting and bracket matching, a plain-text diff checker focuses on readability for everyday content: articles, essays, emails, legal documents, contracts, meeting notes, and more. If you need syntax-aware comparison, try ourCode Diff Tool.
Key Features
Comparison Options
- Inline and side-by-side diff views
- Word-level change detail on modified lines
- Ignore extra whitespace toggle
- Ignore letter casing toggle
- Swap texts with one click
Output & Export
- Colour-coded additions & removals
- Copy unified diff to clipboard
- Download as .txt or .html
- Diff statistics (added, removed, unchanged)
- Line numbers for easy reference
Common Use Cases
- Proofreading and reviewing document edits
- Comparing contract or legal document revisions
- Checking copied text against the original
- Verifying content before and after translation
- Comparing configuration or log file changes
- Reviewing student assignment submissions