Text Diff Checker
Compare two texts and see the differences. Free, no signup.
How It Works
Paste the original text on the left and the changed text on the right, then click Compare. Lines that were removed are highlighted in red, lines that were added are highlighted in green, and unchanged lines are shown in gray. The exact words that changed within a line are highlighted too.
Why Use a Diff Checker?
Diff checking is essential for comparing code changes, reviewing document edits, verifying configuration updates, and spotting unintended modifications between two versions. It is far faster and more reliable than reading two versions side by side by eye.
Frequently Asked Questions
How do I compare two texts?
Paste the original text on the left and the changed text on the right, then click Compare. The differences are highlighted so you can see exactly what was added, removed, or left unchanged.
What do the colors mean?
Green marks lines that were added, red marks lines that were removed, and gray marks unchanged lines. Within changed lines, the specific words that differ are highlighted too.
Can I use it to compare code?
Yes. It compares any plain text line by line, so it works for source code, config files, JSON, logs, and prose alike.
Does it compare line by line or word by word?
Both. It aligns the two texts line by line and then highlights the individual words that changed within each differing line, so small edits are easy to spot.
Is my text private?
Yes. The comparison runs entirely in your browser, so neither text is uploaded to a server. It is safe for confidential documents and code.