🔍
Diff Checker
Compare two texts and instantly highlight every difference — added, removed and changed lines.
✓ Free✓ No Login✓ Line-by-line✓ Instant✓ Private
🎯 Common Use Cases
→Compare code versions
→Review document edits
→Check copy/paste accuracy
→Spot accidental changes
→Compare API responses
→Review config file changes
📖 How to Use the Diff Checker
1
Paste Both Texts
Paste your original text in the left panel and your modified or updated text in the right panel. Works with any plain text or code.
2
Click Compare
Hit the Compare Texts button. Toggle Ignore Whitespace to skip spacing-only differences. The tool analyses both texts line by line instantly.
3
Review the Results
Green lines were added, red lines were removed. Line numbers are shown on the left. A summary at the top shows the total count of each type.
❓ Frequently Asked Questions
What does a diff checker do?+
A diff checker compares two pieces of text and highlights the differences between them. Added text is shown in green, removed text in red, and unchanged text in white. This makes it easy to spot changes at a glance.
What can I use a diff checker for?+
Diff checkers are useful for comparing code versions, reviewing document edits, checking if two files are identical, proofreading text changes, and verifying that a copy/paste was done correctly.
Does it compare line by line or word by word?+
Our diff checker compares line by line by default. Lines that changed are highlighted, and within changed lines the specific added or removed words are marked.
Is the text I compare stored anywhere?+
No. All comparison happens instantly in your browser. Your text never leaves your device and is never stored on any server.
Can I compare code with the diff checker?+
Yes — paste any code into both panels. It works with any plain text including JavaScript, Python, HTML, CSS, JSON and more.