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Compare two blocks of text or code side-by-side with character-level diff highlighting. Powered by Google's diff-match-patch algorithm — 100% browser-based.
Whether you are a software engineer reviewing pull requests, a solicitor comparing contract revisions, or an editor tracking article changes, a reliable diff checker is essential. devmeldex's free online diff checker compares text and code side-by-side with character-level highlighting — and processes everything locally in your browser. No data is ever uploaded to a server, making this the most secure way to compare text online for professionals across the US and UK.
Paste two texts above and click "Compare" to see the differences.
The quick brown fox jumps over the lazy dog.
The quick red fox leaps over the sleepy dog.
The diff checker highlights "brown" → "red", "jumps" → "leaps", and "lazy" → "sleepy" as three discrete changes.
Copy and paste your original text or code into the left panel labelled "Original Text".
Paste the modified or updated version into the right panel labelled "Modified Text".
Click the "Compare Text" button to instantly generate a colour-coded diff showing additions, deletions, and changes.
Toggle between "Side-by-Side" and "Inline" views depending on whether you prefer a split or unified comparison.
Added text appears in green, removed text in red. Character counts for additions and deletions are shown above the output.
Compare pull request changes, configuration file updates, and API contract modifications before merging.
UK solicitors and US attorneys can compare contract drafts without exposing client data to third-party servers.
Editors and writers can track changes between article drafts, catching every word-level modification.
Compare Terraform plans, Kubernetes manifests, and CI/CD pipeline configurations across environments.