Text Compare – Online Diff Checker
100% client-side text compare and diff check. Zero server uploads.
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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 there a file size limit?
Because the processing happens locally on your computer, the only limit is your browser's memory. We officially support file uploads up to 2MB, which easily covers massive log files, config files, and standard codebases.
Does it auto-detect programming languages?
Yes. If you upload files using the upload buttons, our JavaScript reads the file extension (e.g., .py, .json, .js) and switches Monaco's syntax highlighting to the correct language profile.
Can I share my diff with a colleague?
Yes. Click the Share button in the toolbar. Both texts are compressed and encoded directly into the URL using LZ compression — no server or account required. Share the link and your colleague opens the exact same comparison instantly.