Text Diff Checker
Compare two texts and see exactly what changed
🔒 100% бесплатно · без регистрации · файлы не покидают ваше устройство
Spotting the difference between two versions of a text by eye is unreliable — a swapped word, a changed number or a stray trailing space hides easily in a wall of similar-looking lines. A diff tool removes the guesswork: it aligns the two versions line by line, keeps everything they still have in common, and marks precisely what was added, removed or rewritten.
This text diff checker compares two texts side by side using a longest-common-subsequence alignment, the same approach version-control systems use, so a block of inserted lines does not knock the rest of the file out of alignment. Rewritten lines are paired and the changed words inside them are highlighted, long runs of identical lines fold away so only the interesting parts stay on screen, and a summary counts added, removed and unchanged lines at a glance. Toggle “ignore whitespace” when two files differ only in indentation or line endings, or “ignore case” when capitalisation is not meaningful. Everything runs locally in your browser — contracts, drafts and proprietary code are never uploaded.
Зачем нужен Text Diff Checker
Reviewing edits to a contract or policy
Paste the version you sent and the version you got back to see every clause that was altered, including single words swapped inside a long paragraph.
Comparing two config files that behave differently
When one environment works and another does not, diffing the two configuration files usually surfaces the single changed value in seconds.
Checking what an AI or a colleague rewrote
Drop the original draft and the rewritten version side by side to see which sentences were genuinely changed rather than re-reading the whole piece.
Diffing code snippets outside a repository
For pasted logs, SQL queries or functions that are not under version control, this gives you a git-style comparison without creating a commit.
Полезные советы
- Turn on “ignore whitespace” first when a diff looks like everything changed — the usual cause is one file using tabs or CRLF line endings and the other spaces or LF.
- “Collapse unchanged” folds long identical stretches into a single marker, which makes a small change buried in a 2,000-line file easy to find.
- Word-level highlighting only appears on lines that were paired as edits; if a line shows as fully added or removed, its neighbour was too different to pair.
- Use “Swap sides” to check a diff in the other direction — what reads as a confusing deletion often becomes an obvious insertion.
- Ignore case is useful for comparing lists of names, emails or slugs where capitalisation varies but the entries are meant to be the same.
Как пользоваться: Text Diff Checker
- 1Paste the original text on the left
- 2Paste the changed version on the right
- 3Toggle ignore whitespace or ignore case if needed
- 4Read the highlighted added, removed and changed lines
Часто задаваемые вопросы
Is my text sent to a server?▾
No. The comparison runs entirely in your browser, so confidential documents and source code never leave your device.
How large a text can I compare?▾
Up to 8,000 lines per side. If both texts are very long and differ almost everywhere, the tool asks you to compare a smaller section instead of freezing the page.
Why is a line marked as changed instead of added and removed?▾
When a deleted line and an inserted line sit in the same position, they are paired so you can see the two versions side by side with the differing words highlighted.