Text Diff Checker
TextCompare two texts line by line with our free online text diff checker. Added, removed and unchanged lines are shown side by side in your browser.
- Total lines
- 1
- Added
- 0
- Removed
- 0
- Unchanged
- 1
Line-based comparison. Matching lines are paired with LCS alignment; whitespace is compared as-is.
What is a text diff checker?
It compares two documents line by line and aligns them so matching lines stay paired. Lines that appear only in the first text are marked as removed, lines that appear only in the second are marked as added, while identical lines remain unhighlighted.
How should I use it?
- Paste the original text into the left box and the new version into the right box.
- Review the side-by-side view: amber removals on the left, green additions on the right.
- Check the summary tiles for total, added, removed and unchanged line counts.
FAQ
- Is my text uploaded anywhere? No — the comparison runs entirely in your browser and your text never leaves your device.
- Is the comparison case-sensitive? Yes, lines are compared exactly; a line that only differs in capitalization counts as changed.
- How are large texts handled? The comparison is line-based, so pairing stays correct across thousands of lines.
Frequently Asked Questions
What is Text Diff Checker?
Compares two texts line by line and highlights added, removed and unchanged lines side by side.
How do I use Text Diff Checker?
Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.
Is Text Diff Checker free?
Yes, Text Diff Checker is completely free. No signup, no downloads and no usage limits.
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