Diff Checker
Original Text
Modified Text
Frequently Asked Questions
How do I compare two texts online?
Paste your original text in the left panel and the modified text in the right panel. Click Compare to see added, removed, and changed lines highlighted in colour.
Is the Diff Checker free?
Yes, completely free. No signup or account required.
Is my text uploaded to any server?
No. All comparison happens in your browser using JavaScript. Your text never leaves your device.
What types of differences does the tool detect?
The tool detects added lines (green), removed lines (red), and unchanged lines (grey). It performs a line-by-line diff comparison.
Can I use this to compare code files?
Yes. The diff checker works on any plain text including source code, JSON, HTML, CSS, configuration files, and prose documents.
How to Use Diff Checker
Paste your original text or code into the left 'Original' panel.
Paste the modified version into the right 'Modified' panel.
Click Compare — added lines are highlighted green, removed lines red, and unchanged lines are shown in grey.
Use the summary stats to see the total number of additions and deletions at a glance.