Text Diff Checker
Compare two texts side by side.
Resultado Diff
¿Por qué usar el Diff de Docuboxer?
A diferencia de otras herramientas online (como Diffchecker), Docuboxer procesa tus textos 100% en tu navegador usando WebAssembly local. No enviamos tu código, secretos o documentos privados a ningún servidor para calcular las diferencias, asegurando privacidad total.
How do you compare two texts and see the differences?
Docuboxer's text diff checker puts two versions of a text side by side and highlights exactly what changed between them: added lines in green, deleted lines in red, modified lines in yellow — and within each changed line, the comparison goes down to the character level, so you see the precise words or symbols that differ, not just "this line changed". Paste the original on the left, the revised version on the right, and read the changes at a glance, with a summary of the differences to navigate by. Everything runs in your browser: contracts, code, confidential drafts — none of it is uploaded to any server, and the tool keeps working offline once the page has loaded. It handles texts of any length and of different lengths, marking lines that exist in only one version clearly. Free, no signup, no size limits beyond your device's memory.
How to use Text Diff Checker
- Paste the original text into the left panel and the modified version into the right panel.
- The comparator automatically highlights the differences: added lines in green, deleted in red, modified in yellow.
- Review the changes side by side and use the difference summary to pinpoint exactly what was altered between versions.
Common use cases
Review changes in documents and contracts
Compare successive versions of contracts, policies or legal documents to quickly spot modified clauses, added paragraphs or deleted text before signing.
Verify code and config changes
Diff configuration files, scripts or code snippets before and after an edit to confirm only the intended changes were made — and catch accidental ones.
Check edits to articles and copy
See exactly what an editor, teammate or AI assistant changed in your draft, sentence by sentence, without rereading the whole piece.
Compare exported data snapshots
Diff two exports of the same list or report to find which entries were added, removed or modified between snapshots.
Compare confidential texts privately
Contracts and internal documents are diffed entirely in your browser — neither version is ever uploaded to a server.
Frequently asked questions
How do I compare two texts online for free?
Paste one version in each panel and the differences highlight instantly — additions in green, deletions in red, edits in yellow. Free, no signup, and both texts stay in your browser.
Does it compare whole lines only, or changes within a line?
The comparator works at the character level inside each line, precisely highlighting the specific words or symbols that changed even when the line wasn't entirely replaced.
Can I compare texts of different lengths?
Yes — the tool handles texts of any length. Lines that exist in one text but not the other are clearly marked as added or removed in the comparison result.
Can I diff code with this tool?
Yes. It's a plain-text comparison, so source code, configs, SQL, JSON or any other text diffs cleanly — useful when you don't have a git diff at hand.
Do whitespace and blank lines count as differences?
The comparison is faithful to the text you paste, so whitespace changes show up as differences. If you only care about content, normalize the formatting of both versions before comparing.
Are the texts I compare uploaded anywhere?
No. The diff is computed entirely in your browser's memory — no server, no logs, no retention — and the tool works offline once the page has loaded.