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JSON formatter
↗Pretty-print, minify and validate JSON in your browser — nothing leaves your machine.
Text·Available now
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Text tool
Text diff checker
Compare two texts line by line and highlight added, removed and changed lines.
No files needed100% local · no upload
Guide
How to convert text diff checker
Paste the original
Drop the old version into the left pane.
Paste the new version
The right pane compares live as you type — no button needed.
Review the changes
Added lines are green, removed lines are red, unchanged context stays plain.
Frequently asked questions
How does the comparison work?
A line-level diff algorithm (LCS-based) matches unchanged lines and highlights insertions and deletions.
Is my text uploaded?
No — the diff runs in your browser. Sensitive configs and contracts stay on your device.
Can it compare code files?
Yes — anything text-based. Line numbers on the left show positions in the original document.
Keep converting
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