Text Diff help

Paste an old version on the left and a new one on the right. The tool lines the two up and marks what changed. Nothing you paste leaves the tab.

Steps

1. Paste or load text into both boxes. "Load a file" reads a text file from your device.
2. Read the result. Side by side pairs each line; unified shows one column with + and -.
3. On a changed line, the exact words that differ are highlighted.
4. Use "Copy patch" or "Save .patch" to take the unified diff into Git or an email.

Options

• Ignore whitespace. Lines that differ only in spacing or indentation count as unchanged.
• Ignore case. Upper and lower case are treated the same when matching lines.
• Context. How many unchanged lines to keep around each change in the unified view.

Limits

• The diff is line based. Moving a paragraph shows as a delete and an add, not a move.
• Very large inputs (tens of thousands of lines) use more memory because the whole comparison is held at once.
• The patch output is a standard unified diff. It is not a Git binary patch.

The comparison runs in your browser. Nothing you paste or load is uploaded.