Text Diff Checker — Compare Two Texts Online Free
Paste two pieces of text to instantly see what changed. Added lines are highlighted green, removed lines in red. Choose between inline diff, side-by-side comparison, and a stats view showing similarity percentage. Export results as a .patch file. Everything runs in your browser — nothing is uploaded anywhere.
100% private. Text comparison runs entirely in your browser. No content is sent to any server.
How to Compare Texts Online Free
- 01
Paste both texts
Paste your original text in the left panel and the modified text in the right panel. Click "Load sample" to try a quick example.
- 02
Choose your view
Switch between Inline diff (single view with highlights), Side by side (two panels), and Stats (numbers only). Set ignore options as needed.
- 03
Export the result
Copy the diff to clipboard or download as a .diff / .patch file compatible with git and other tools.
Frequently Asked Questions
What is a text diff checker?
A text diff checker compares two pieces of text and highlights the differences between them. It shows which lines or words were added, removed, or unchanged. Diff tools are widely used in software development to review code changes, but are equally useful for comparing document revisions, article drafts, or any text content.
What is the difference between inline and side-by-side diff?
Inline diff shows additions and deletions in a single view — added text is highlighted in green and deleted text in red with strikethrough. Side-by-side diff shows the original text on the left and the modified text on the right, making it easier to read large changes without losing context.
What does "ignore whitespace" do?
When "Ignore whitespace" is enabled, the diff treats lines that differ only in spaces, tabs, or indentation as identical. This is useful when comparing code that has been reformatted or text where trailing spaces may differ.
Can I download the diff result?
Yes. Click "Download .diff" to save the diff as a standard .patch file. This file format is compatible with git, patch utilities, and most code review tools. You can also click "Copy patch" to copy the diff to your clipboard.
How is similarity percentage calculated?
Similarity is calculated as (unchanged lines / total lines) × 100. A similarity of 100% means the texts are identical. A similarity of 0% means no lines are shared. This gives a quick measure of how similar the two texts are overall.