SnapDiff is the fastest client-side redline tool. Compare Word, Excel, and text files side-by-side directly in your browser. Zero uploads, zero tracking, 100% private.
Trusted by professionals who handle sensitive data
No accounts, no uploads, no waiting. Just pure, instant comparison.
Select your original and revised documents (.docx, .xlsx, .txt, or .csv).
Our browser-based engine instantly highlights additions in emerald and deletions in red.
Close the tab. Your files were never uploaded to any server. Complete privacy guaranteed.
Unlike free online tools, we don't have a backend server to store your files. Processing happens locally via WebAssembly.
No upload or download wait times. Large documents are parsed and compared in milliseconds.
Native support for Word (.docx), Excel (.xlsx), CSV, and plain text files.
The quarterly revenue annual profit increased by 15%.
Please review the attached updated financial statements.
"Finally, a tool I can use for client NDAs without worrying about data leaks."
— Sarah J., Corporate Attorney
Absolutely not. SnapDiff runs 100% in your browser using client-side JavaScript. Your file is never uploaded to our servers, and we have no database to store it. Once you close the tab, it's gone forever.
We currently support Microsoft Word (.docx), Excel (.xlsx, .xls), CSV, and plain text (.txt) files. PDF support is coming soon for Pro users.
Yes, the free tier allows up to 3 document comparisons per day. For unlimited comparisons, larger file sizes (up to 50MB), and priority support, you can upgrade to Pro for $9/month.