Should I use side-by-side or unified view?

Side-by-side is easier for short files where you want to see both versions at the same time. Unified scales better to long files because deletions and insertions are interleaved in a single column — that is the format git uses by default.

Can I diff at the word level?

Yes. Toggle word-level diff and the tool highlights the specific words that changed within a line, instead of marking the whole line as different. That is the right view for prose or wording changes.

Is whitespace ignored?

By default, yes. Toggle whitespace-sensitive mode on if you are diffing code where indentation matters. The tool also has an option to ignore trailing whitespace and case differences.

How large can the input be?

Multi-megabyte text files diff in a few seconds. Beyond that, expect a slowdown — the diff algorithm is quadratic in the worst case, so very large inputs with many small changes get slow.

Is my text sent anywhere?

No. The diff runs entirely in your browser. Nothing is uploaded or logged.

Text Diff Checker — Compare Text Side-by-Side Online

Compare two text inputs side by side or in unified form, with insertions, deletions, and changes highlighted clearly. Toova diffs anything — code, config, prose, JSON — entirely in your browser, with no upload and no signup.

Side-by-side and unified views

Side-by-side shows the two inputs next to each other with changes lined up — best for short files where you want to read both versions at once. Unified shows a single column with insertions and deletions interleaved, the classic git diff format that scales to longer files. Toova lets you switch between views without losing your input.

Word-level and line-level diff

Line-level diff treats each line as the atomic unit of comparison, which is what most version control systems use. Word-level diff highlights the specific words that changed inside an otherwise-similar line, which is useful when reviewing prose or rewording paragraphs. Toova offers both — pick the granularity that fits the content you are comparing.

Local-only diff

Every diff happens entirely in your browser. The two inputs never leave the page. That makes the tool safe for comparing internal documents, configuration files, code reviews, or anything covered by privacy rules. The page works offline after first load and there are zero outbound requests during the diff.

Frequently Asked Questions

Should I use side-by-side or unified view?: Side-by-side is easier for short files where you want to see both versions at the same time. Unified scales better to long files because deletions and insertions are interleaved in a single column — that is the format git uses by default.
Can I diff at the word level?: Yes. Toggle word-level diff and the tool highlights the specific words that changed within a line, instead of marking the whole line as different. That is the right view for prose or wording changes.
Is whitespace ignored?: By default, yes. Toggle whitespace-sensitive mode on if you are diffing code where indentation matters. The tool also has an option to ignore trailing whitespace and case differences.
How large can the input be?: Multi-megabyte text files diff in a few seconds. Beyond that, expect a slowdown — the diff algorithm is quadratic in the worst case, so very large inputs with many small changes get slow.
Is my text sent anywhere?: No. The diff runs entirely in your browser. Nothing is uploaded or logged.