± Text Diff Checker
Compare two blocks of text side by side and see differences highlighted. Line-by-line and word-level diff view. Free online text diff tool — no signup, works in browser.
How to Use
1
Paste your texts
Paste the original text in the left box and the modified text in the right box.
2
Click Compare
Press Compare to instantly highlight all additions, deletions, and unchanged lines.
3
Read the results
Green lines are additions, red lines are deletions, grey lines are unchanged.
Frequently Asked Questions
How does the diff checker work?
The tool compares your two texts line by line. Lines only in the first text are shown in red (removed), lines only in the second text are shown in green (added), and matching lines are shown in grey (unchanged).
Can I compare code files?
Yes. Paste any code, configuration files, JSON, SQL, or plain text. The tool highlights exactly which lines changed.
What does "ignore whitespace" do?
When enabled, lines that differ only in leading/trailing spaces or tabs are treated as equal. Useful when comparing code that was reformatted.
Is there a size limit?
There is no hard limit, but very large texts (100,000+ lines) may be slow since all processing happens in your browser.
Is my text sent to a server?
No. The entire comparison is done in JavaScript in your browser. Your text never leaves your device.
Guide : Comparateur de Texte
Qu'est-ce que c'est ?
Le Comparateur de Texte identifie les différences caractère par caractère ou ligne par ligne entre deux textes, avec surlignage coloré des modifications.
Utile pour comparer des versions de documents, des messages d'erreur ou des sorties de commandes.
Comment utiliser
- Collez le premier texte dans le panneau gauche.
- Collez le second texte dans le panneau droit.
- Choisissez le mode : diff par ligne ou par mot.
- Consultez les différences surlignées (vert=ajout, rouge=suppression).
Conseils professionnels
- Le mode "mot" est plus précis pour les textes en prose avec peu de différences.
- Utilisez ce comparateur pour valider les traductions — comparez l'original et la traduction terme à terme.