Free Text Diff Checker
for developers.
Compare two blocks of text instantly with this free online text diff checker. Highlight added, removed, and unchanged lines directly in your browser.
Original text
Updated text
Diff result
Added: 3 · Removed: 2 · Unchanged: 2
Supported
- Line-by-line text comparison
- Added lines
- Removed lines
- Unchanged lines
- Live diff updates as you type
- Copyable diff summary
Automatically handled
- Windows and Unix line endings are normalized automatically
- Line numbers are displayed for both sides
- Added and removed lines are color-highlighted
- Empty lines are preserved in the comparison
Not supported yet
- Word-level inline diff highlighting
- Character-level diff mode
- File upload support
- Git-style moved block detection
Free online text diff checker
This tool compares two blocks of text instantly in your browser and highlights added, removed, and unchanged lines. It is useful for code snippets, documentation, notes, config files, and plain text comparisons.
Developers often need a quick text diff checker to compare versions of a file, inspect edits, validate updates, or spot changes without opening a full diff tool. This version keeps the experience simple and fast.
The comparison runs locally in your browser. Your text is not uploaded, stored, or sent anywhere.
Example
Original:
John Doe
Tokyo
Frontend Developer
Updated:
John Doe
Kyoto
Frontend EngineerPaste two text blocks into the diff checker above to instantly compare the differences.
Compare text online
Use this text diff checker to compare content changes, verify edits, inspect updated text, and spot differences between two versions of plain text.
Common use cases
- Compare two versions of documentation or notes
- Check text changes before publishing updates
- Inspect config or code snippet revisions quickly
- Spot added and removed lines in plain text
How it works
The tool compares the left and right inputs line by line after normalizing line endings. Matching lines are marked as unchanged, while differences are shown as removed and added lines.
This makes it easy to scan two text blocks visually and understand what changed without needing Git, a local editor, or a dedicated desktop diff application.
The result is a fast browser-based comparison view that works well for quick developer workflows.
FAQ
What is a text diff checker?
A text diff checker compares two versions of text and highlights what was added, removed, or left unchanged.
Does this tool compare text line by line?
Yes. This version compares text line by line, which is ideal for documentation, notes, config files, and many developer workflows.
Is my text uploaded anywhere?
No. The diff checker runs locally in your browser and your text is not uploaded.
Does it support word-level diff?
Not yet. This first version focuses on line-by-line comparison for speed and simplicity.
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