Text ToolsFree

Text Diff Checker

Compare two blocks of text side by side and highlight every difference line by line with color-coded additions, deletions, and changes. Ideal for proofreading, reviewing document edits, comparing code versions, and spotting subtle content changes. Works entirely in your browser.

Frequently Asked Questions

How does the text diff checker highlight differences?▼
It compares texts line by line. Lines only in the first text appear in red (removed), lines only in the second appear in green (added), and unchanged lines are shown in neutral color.
Can I compare code files with the diff checker?▼
Yes. Any plain text — including code in Python, JavaScript, HTML, SQL, or any language — can be compared line by line.
Is there a character or length limit?▼
No. You can compare documents of any length, from a few words to thousands of lines.
Are the texts sent to a server for comparison?▼
No. The diff algorithm runs entirely in your browser. Your text never leaves your device.