Diff Checker
Compare two blocks of text and see exactly what changed — instantly. Paste the original and the changed version; added, removed, and unchanged lines are highlighted as you type.
What is a diff checker?
A diff checker compares two texts line by line and highlights what was added, removed, or left unchanged. It’s the fastest way to review an edit, compare two versions of a document, check code changes, or see exactly what a copy-edit touched.
This tool does it entirely in your browser using a line-based longest-common-subsequence comparison — the same approach version-control tools use — so your text never leaves your machine and results appear the moment you paste.
Frequently asked questions
How do I compare two pieces of text?
Paste the original text into the left box and the changed version into the right box. The differences appear instantly below — added lines in green, removed lines in red, unchanged lines in muted text. There's no button to press.
What does a diff checker do?
A diff checker compares two texts line by line and shows what was added, removed, or kept the same. It's used to review edits, spot changes between versions of a document, compare code, or check what a copy-edit changed.
Is my text uploaded anywhere?
No. The comparison runs entirely in your browser with JavaScript. Nothing you paste is sent to a server, so it works offline and keeps your content private.
Is there a size limit?
Each side can hold up to 100,000 characters, which keeps the comparison instant. For larger files, compare them in sections.
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