0 lines, 0 characters
0 lines, 0 characters
How to Use Text Diff
Paste the original text on the left and the modified text on the right, then click Find Difference. The result is a side-by-side comparison with line numbers. Removed and changed words are highlighted in red. Added and changed words are highlighted in green.
Legend
- redText removed from the original, or the words that changed on that side
- greenText added in the modified version, or the words that changed on that side
- blankNo matching line on that side
Updated: October 2026
Note: Comparison runs in your browser. Nothing is uploaded. Very long texts are limited so the page stays responsive.
Related Dev Tools
Frequently Asked Questions
What is a text diff tool?
A text diff (difference) tool compares two text blocks line by line and highlights the differences. It shows which lines were added, removed, or changed. This is essential for comparing code versions, document revisions, configuration files, or any text content.
How do I read the diff output?
Click Find Difference to open a side-by-side view. The left pane is the original text and the right pane is the modified text. Red highlights mark removed or changed words. Green highlights mark added or changed words. A blank row means that line exists only on the other side. The headers show how many removals and additions were found, plus the line count for each side.
What are common uses for text diff?
Common uses include: comparing code before/after changes, reviewing document edits, checking configuration file updates, comparing database schemas, verifying API responses, debugging text processing issues, code review workflows, and tracking content changes over time.
Can I use this for large files?
This tool works best for small to medium-sized text files (up to a few thousand lines). For very large files or binary files, use command-line tools like diff, git diff, or specialized diff software.
Does this work like git diff?
It shows a split comparison with line numbers and highlights the words that changed, similar to a basic side-by-side diff. Git diff can also detect moved blocks and handle merge conflicts. For comparing two pasted texts, this view is faster to read.
Is my text data safe?
Yes! All text comparison happens entirely in your browser. No text is uploaded to any server. Your data stays on your device. The diff calculation is done client-side using JavaScript.