Text comparison (diff)
Spot the differences between two texts.
- Instant
- Free
- Private (processed locally)
- No sign-up
See what changed, instantly
Comparing two versions by eye is tedious and error-prone. This diff tool aligns the two texts and highlights every addition and deletion, line by line, with a clear count.
How to use it
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Paste the original text
The reference version.
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Paste the changed text
The version to compare.
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Read the result
Added and removed lines are highlighted.
Use cases
- Document versions: spot what changed between two drafts.
- Code and config: review changes before committing them.
- Proofreading: compare a translation or edit against the original.
Comparison runs locally — your texts never leave the browser.
Frequently asked questions
How does the comparison work?
The tool compares the two texts line by line, finds the longest common sequence, then marks each line as unchanged, added or removed.
Does it compare letters or lines?
Lines. It is ideal for paragraphs, lists, code or configuration files.
What do + and − mean?
A line marked “+” exists only in the second text (added); a line marked “−” exists only in the first (removed).
Is there a size limit?
It handles large texts; for very large inputs the diff is simplified to stay fast.
Are my texts sent online?
No. Everything is computed locally in your browser.