Diff Checker
Client-Side SecureFree online Diff Checker. Compare text, code, or JSON files side-by-side to find differences. Highlight changes.
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The Ultimate Online Diff Checker
Compare text, code, or JSON files instantly to spot differences. Whether you are a developer resolving Git conflicts, a writer checking revisions, or a student comparing lists, RootUtils highlights every change with precision.
Paste your original text on the left and your modified text on the right. We detect added lines, deleted words, and even single character typos automatically. Prefer tidy diffs? Flip on whitespace ignoring or switch to word-level highlighting to keep focus on meaningful changes.
Understanding Colors
We use standard diff coloring:
Red Background = Content removed from the original.
Green Background = Content added to the new version.
Semantic JSON Diff
Comparing API responses? Select "JSON" mode. We format and sort keys before comparing, so you see actual data changes instead of just whitespace or ordering noise.
Private & Secure
Compare sensitive code or contracts safely. All processing happens locally in your browser. Your text is never sent to our servers or stored in any database.
Split vs. Unified View
Split View (Side-by-Side)
Best for humans. It shows the original text on the left and the new text on the right. This mimics modern IDEs like VS Code and is easiest for comparing full documents.
Unified View (Git Style)
Best for patches. It merges both texts into a single column, showing lines one after another. This is the standard output format for command-line tools like `git diff`.
Tip: Toggle word-level highlighting while keeping line mode on to see inline changes per line, and enable whitespace ignoring to focus only on meaningful edits. Your choices are remembered automatically for future visits.
Frequently Asked Questions
Can I ignore whitespace?
Yes. Toggle "Ignore Whitespace" in the toolbar to hide indentation changes or trailing spaces, then choose the diff style that fits your workflow.
Does this work with Word Documents?
This tool works with plain text. If you have a `.doc` or `.pdf`, you must copy and paste the text contents into the input boxes to compare them.
Can I compare line diffs but still highlight words?
Yes. Enable \"Word-Level Diff\" while keeping Line mode selected to show inline highlights inside each changed line—perfect for code reviews and prose edits.
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