Text and File Diff Checker
Compare two texts or supported text files line by line and highlight added, removed and changed content. Processing takes place locally in your browser.
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What Text and File Diff Checker does
Compare two texts or supported text files line by line and highlight added, removed and changed content.
Worked example
Original: color=blue · Revised: color=green
One changed line, showing blue removed and green added
How it works
A line-diff algorithm aligns similar regions and labels unmatched lines as additions or removals. Character highlighting may then show changes inside matched lines.
Developer workflows
- Review configuration and document revisions
- Compare generated output with an expected fixture
- Locate small differences in copied text
Security and compatibility checks
- Line-ending and whitespace differences can create noisy results.
- This is not a semantic code review or merge tool.
- Large files can use substantial browser memory.
Frequently asked questions
Can the diff ignore whitespace?
Use the whitespace option when available, but keep it enabled when indentation or spacing is meaningful.
Are uploaded files sent to a server?
This tool reads supported text files locally in the browser.
Processing takes place locally in your browser.