Text Compare & Diff Checker
100% client-side text compare and diff check. Zero server uploads.
Original
Modified
Why This Text Compare is Better (and Safer)
100% Client-Side Privacy
Other popular diff checking and text compare websites upload your pasted code to their backend servers. If you are comparing proprietary source code, database dumps, or files containing API keys, that is a massive security risk. Our tool runs the comparison engine entirely in your local browser memory. Your code never traverses the internet.
Editable Merge Resolution
Most diff checkers only let you view the differences. Because we utilize the VS Code engine, our comparison viewer is fully editable. You can spot differences, type directly into the viewer to merge your code manually, and copy the final output immediately.
Frequently Asked Questions
Is it safe to paste proprietary code or API keys into this diff checker?
Yes, completely safe. Unlike popular diff checkers such as Diffchecker that process your text on their servers, our tool runs the entire comparison engine locally in your browser using Monaco. Your code never leaves your device, making it enterprise-secure.
How do I ignore timestamps, UUIDs, or specific noise in a diff?
You can use standard JavaScript (ECMAScript) Regular Expressions to strip out specific text before the diff is calculated. Check the Ignore Regex box in the toolbar and enter your pattern.
Common examples:
- Ignore brackets & contents (e.g.
[2026-10-08]):\[.*?\] - Ignore standard UUIDs:
[a-f0-9\-]{36} - Ignore IPv4 addresses:
\d{1,3}(\.\d{1,3}){3}
How do I compare JSON while ignoring key order?
Comparing semantic JSON data can be frustrating when keys are simply out of order. Paste your JSON payloads into both inputs, select JSON from the Language dropdown, and click the Format button. Our tool will automatically parse the JSON and rebuild it with keys sorted alphabetically, allowing the engine to highlight true structural differences instead of meaningless layout changes.
How can I easily diff minified code?
Because diff checkers use line-based comparison algorithms, they struggle to compare minified files where all the code is compressed onto a single massive line. Our Format button will automatically unminify and sort JSON data. However, for minified JavaScript or CSS, we strongly recommend running your code through a dedicated formatter before pasting it here to prevent the diff engine from hanging or timing out.
What is the difference between a text compare tool and a diff checker?
They are the same thing. A diff checker compares two versions of text or code and highlights what has been added, removed, or changed. Text compare tools display these differences visually, often side-by-side or inline.
What keyboard shortcuts are available?
- Compare Texts:
Ctrl + Enter(or Cmd + Enter) - Swap Inputs:
Ctrl + Shift + S - Toggle Fullscreen: Press native browser
F11
Can I compare code files, not just plain text?
Yes. Our diff tool supports syntax highlighting for JavaScript, TypeScript, Python, CSS, HTML, XML, JSON, SQL, and Bash. If you upload a file, the tool automatically detects the language from the file extension.
Can I edit the code while viewing the diff?
Yes. The comparison viewer is fully editable. You can type directly into either side of the diff to manually merge changes, resolve conflicts, and then copy the final output using the Copy Original or Copy Modified buttons.
Is there a file size limit for the diff checker?
The tool officially supports file uploads up to 2MB. Because all processing happens locally in your browser, the practical limit is your device's available memory. For files larger than a few megabytes, your browser may experience a delay while parsing.
How do I ignore whitespace changes in a diff?
Check the Ignore Whitespace checkbox in the toolbar before clicking Compare. This tells the diff engine to skip changes that are only spaces, tabs, or indentation differences, allowing you to focus on logic changes.
Can I share my diff with someone else securely?
Yes. Click the Share button to generate a shareable permalink. Both texts are compressed and encoded directly into the URL fragment hash. Because the data is stored in the URL fragment, it is processed entirely locally and is never sent to a server. Note: Browser URL limits safely allow around 8,000 characters.
Does this text compare tool work offline?
Once the page has loaded and Monaco editor assets are cached, the comparison works fully offline since all processing is client-side. The initial page load requires an internet connection.