Can I compare code in any programming language?

Yes. The diff works on plain text so any language — Python, JavaScript, SQL, JSON, YAML — is supported.

Is there a size limit for the text I can compare?

No hard limit, but very large files (10,000+ lines) may slow down the browser. For large codebases, use Git diff on the command line.

Are my comparisons saved to a server?

No. Everything runs in your browser. Saved diffs are stored in localStorage on your device only.

developer

Code Diff Checker

Compare two blocks of text or code securely in your browser. Your code is never uploaded to a server—100% private diff checking with additions in green and deletions in red.

Built & maintained by Shakeel Ahmed · Full-Stack Developer & Privacy Tools Builder

Compare two blocks of text or code securely in your browser. Your code is never uploaded to a server—100% private diff checking with additions in green and deletions in red.

+3 added-3 removed

Original

Modified

Diff result

1function hello() {

2 console.log('hello world');

3 return true;

1function hello(name) {

2 console.log(`hello ${name}`);

3 return name;

Diffs saved locally

Found the differences? You might need to format messy code, or test a regex.Private JSON Formatter

Code Diff Checker

What is a diff checker?

Your data stays private

Code Diff Checker

What is a diff checker?

Your data stays private

Other Tools