🔒 Enterprise-Grade Privacy: All file processing happens in your browser. We never see, store, or access your data.
Everything you need to know about VeriDiff smart file comparison
VeriDiff is a British-engineered file comparison tool that processes everything locally in your browser for complete privacy. It specializes in intelligent field mapping and tolerance settings for business data that is never perfect - perfect for finance teams, analysts, and consultants who need to compare Excel, CSV, PDF, JSON, XML, and TXT files.
No installation required! VeriDiff runs entirely in your web browser. Simply navigate to the application and start comparing files immediately. All processing happens locally on your device for maximum security.
Yes! Excel-Excel comparisons are completely FREE forever for signed-in users. You get unlimited comparisons, smart mapping, tolerance settings, and local processing - no credit card required. Premium (£19/month) unlocks all other file formats like CSV, PDF, JSON, XML, and TXT.
VeriDiff requires an internet connection for the initial loading and user authentication. Once loaded, all file processing happens locally in your browser, but you need to stay connected for the web application interface.
Recommended: Chrome (best performance), Firefox, Safari, Edge. Minimum versions: Chrome 80+, Firefox 75+, Safari 13+, Edge 80+. Not supported: Internet Explorer.
The free tier includes unlimited Excel-Excel comparisons with all smart features: intelligent header mapping, tolerance settings, local processing, GDPR compliance, and downloadable results. You just need to sign in with your email - no credit card required.
Premium adds: Excel-CSV comparisons, CSV-CSV comparisons, PDF text comparison, JSON comparison, XML comparison, TXT file comparison, advanced tolerance controls, priority support, and early access to new features. All with the same local processing security.
We use Stripe for secure payment processing. You can cancel anytime from your account dashboard - no hassle, no questions asked. We offer a 30-day money-back guarantee if you're not completely satisfied.
Yes! You can start a Premium trial which gives you full access to all formats and features. The trial includes our 30-day money-back guarantee, so you can test Premium risk-free with your real business data.
Currently we offer individual Premium subscriptions at £19/month. Enterprise features and team billing are planned for future releases. Contact us at sales@veridiff.com for early access discussions.
Free tier: Excel (.xlsx, .xls, .xlsm) to Excel comparisons with unlimited usage. Premium tier: Excel ↔ CSV, CSV ↔ CSV, PDF (.pdf) text-based, JSON (.json), XML (.xml), and Text (.txt). Cross-format combinations are a VeriDiff specialty.
Yes! VeriDiff automatically detects all worksheets in Excel files and lets you: Select specific sheets to compare, preview headers and row counts for each sheet, handle hidden sheets appropriately, and compare different sheets from the same workbook.
No, VeriDiff cannot process password-protected or encrypted files. You'll need to remove password protection before uploading. This is a security feature - we never want to handle your passwords.
Currently, VeriDiff only works with text-based PDFs where text can be extracted. Scanned PDFs (images) require OCR processing, which is planned for future Premium features.
Your files are completely private and secure: No server upload (files never leave your device), browser-only processing (all comparison logic runs locally), no data storage (no information is saved on external servers), session-only (data is cleared when you close the browser tab). This is our core security promise.
Absolutely not. VeriDiff processes files entirely within your browser using JavaScript. Our servers never receive your file contents, comparison results, or any data you process. Even we cannot see what you're comparing.
Yes, VeriDiff's client-side processing model supports compliance with: GDPR (no personal data processing on servers), HIPAA (suitable for healthcare data with proper organizational controls), SOX (maintains audit trail integrity), and other industry standards.
We use NextAuth for secure authentication. You can sign in with email or social providers. We only store your basic profile information (name, email, subscription tier) - never your file data. All authentication is handled securely through industry-standard protocols.
VeriDiff uses advanced JavaScript libraries to parse and compare files entirely in your browser. When you upload files, they're processed by client-side code running on your device. The comparison algorithms, tolerance calculations, and results generation all happen locally - nothing is sent to our servers.
VeriDiff can handle large files efficiently since processing happens on your device. Practical limits depend on your device's memory and browser capabilities. Most business files (up to 100MB+) work smoothly. For massive datasets, consider splitting files or contact us for optimization advice.
VeriDiff uses sophisticated algorithms to match columns even when headers don't match exactly. It considers: similarity scoring, data type analysis, position analysis, and contextual clues. You can always review and adjust mappings before running comparisons.
Currently VeriDiff is a standalone web application. API access and integrations are planned for future releases. You can export results in Excel or CSV format for use in other tools.
First, try refreshing your browser and ensuring you're using a supported browser version. Check that JavaScript is enabled. For persistent issues, contact us at support@veridiff.com with details about your browser, file types, and the specific problem.
Yes! Free users get community support through our help documentation. Premium users get priority email support with faster response times. We're a London-based team committed to helping you succeed with your data comparisons.
Absolutely! We love helping users optimize their comparison workflows. Premium users get priority consultation on complex mapping scenarios, tolerance settings, and best practices for their specific use cases.
Report bugs or suggest features by emailing support@veridiff.com. Premium users' requests get priority consideration in our development roadmap. We regularly update VeriDiff based on user feedback.