Text Diff — Compare Lines, Local | How to use and interpret results
Compare text lines and produce a diff with plus additions and minus removals. An 800-line-per-side cap keeps the operation suited to short drafts and configurations.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
How to use this tool
Place the old version on the left and the new one on the right. Line boundaries determine comparison, so automatic rewrapping can create many apparent changes.
Results and examples
An old line A and new line B produce - A and + B. This records a line removal and addition rather than a character edit, and can be saved as diff.txt.
Worked example
An old line A and new line B produce - A and + B. This records a line removal and addition rather than a character edit, and can be saved as diff.txt.
Limitations
- Word-level and binary-file comparison are not supplied.
- Inputs over 800 lines per side need to be split for review.
Fields
| Field | Guidance and constraints |
|---|---|
| Original | Check the unit and format displayed beside this field. |
| Revised | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
How does changing A to B appear?
An old line A and new line B produce - A and + B. This records a line removal and addition rather than a character edit, and can be saved as diff.txt.
Can a large file be compared in one pass?
Word-level and binary-file comparison are not supplied. Inputs over 800 lines per side need to be split for review.
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