// compare two texts · highlight added · removed · unchanged lines · nothing leaves your browser
0 added0 removed0 unchanged
original text
modified text
diff result
What is a diff checker?
A diff checker compares two versions of text and highlights what changed — lines added, removed, or unchanged. It's essential for code reviews, comparing document versions, spotting API response changes, or verifying that a refactor didn't accidentally change logic.
How to use this tool
Paste your original text in the left panel
Paste the modified text in the right panel
Click Compare to see the diff
Green lines were added, red lines were removed
Gray lines are unchanged
Frequently Asked Questions
Does this work for code?+
Yes — paste any code, JSON, config files, or plain text. The diff is line-based so it works the same regardless of whether you're comparing prose, Python, YAML, or SQL.
Is my text kept private?+
Yes. All comparison happens in your browser using JavaScript. Nothing is sent to any server. This makes it safe to compare sensitive config files, private documents, or proprietary code.