Free Tool — Private & Fast

Diff Checker

Compare two texts and find differences. Line & word-level diff with ignore options. Upload .txt files.

Show:
Summary +0 -0 =0 unchanged
Why Use AFFLIGO?
Fully Private
Your text never leaves your browser. 100% client-side.
Color-Coded
Green for additions, red for removals, amber for word-level changes.
LCS Algorithm
Accurate line & word-level diff. Ignore whitespace/case options.
Read the Guide
How to Use Diff Checker
Step-by-step guide to compare text differences online.
Read Guide →
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How to Compare Texts

Step 1
Paste Texts
Add the original and changed texts into the two boxes.
Step 2
Set Options
Toggle ignore whitespace, ignore case, or word-level mode.
Step 3
Compare & Copy
Click Compare to see differences, then Copy Diff to export.

Frequently Asked Questions

What types of text can I compare?
Compare any two blocks of text - code, documents, or plain text.
How are differences shown?
Added lines are highlighted in green, removed lines in red, and changed lines in amber.
Is my text private?
Yes, all comparison happens in your browser. No text is sent anywhere.
Can I compare code?
Yes, works with any text including source code in any programming language.
Can I copy the diff?
Yes, copy the comparison results to clipboard with one click.