Compare two text files or code snippets side by side with syntax highlighting. Free online diff checker. Spot additions, deletions, and changes instantly. No signup required.
Diff checking is essential for comparing two versions of a document, reviewing changes before a code commit, spotting differences between two configuration files, or verifying that a text transformation produced the expected output. The side-by-side view with colour-coded additions and deletions makes it immediately obvious what changed between two versions.
All processing for Text Diff Checker runs entirely in your browser. Your data — whether text, files, or other content — is never transmitted to any server. DevToolHub has no backend that receives or stores your inputs. This means the tool works even offline once the page has loaded, and there is no risk of your data being intercepted or stored by a third party.
Is my text stored on your server?
No. The entire comparison process is performed in your browser. Your text is never sent to any server, ensuring complete privacy.
Can this tool compare entire files?
While you cannot upload files directly, you can open your files in a text editor, copy the entire content, and paste it into the respective input boxes.
What types of changes does the diff highlight?
The tool highlights three types of changes: additions in green, deletions in red, and unchanged lines in neutral. This side-by-side view makes it easy to spot exactly what changed between two versions.
DevToolHub offers 25+ free browser-based developer tools. Explore the full toolkit — no signup or installation required for any of them.