How to use this tool
- Paste the original text on the left.
- Paste the changed version on the right.
- Added lines highlight green, removed lines highlight red — unchanged lines stay plain.
Why diff text in the browser?
This computes the diff locally using a standard longest-common-subsequence algorithm — the same family of algorithm behind git diff — so neither version of your text is ever sent anywhere, which matters when comparing drafts of something not yet public.
Frequently asked questions
- Does this compare word-by-word or line-by-line?
- Line-by-line — each line is treated as a unit, so a single-character change inside a long line will show that whole line as removed and re-added, not just the changed character.
- Why does a small edit show as a big change?
- If you move a block of lines to a different position, the diff shows it as removed from the old position and added at the new one — that's expected for a line-based diff, not a bug.
How GetByteRush compares
Most free tools for this online work the same way: you upload your file to their server, wait, then download the result — which means your file (and often your email, for a "free" account) sits on someone else's infrastructure. Here's the actual difference:
| Feature | GetByteRush | Typical online diff tools |
|---|---|---|
| Data ever leaves your device | No — 100% client-side | Often yes |
| Account required | Never | Sometimes |
("Typical online tools" reflects publicly documented behavior of common free file-processing sites as of 2026 — always check a specific competitor's own privacy policy and pricing page, since these details change.)