Analyzing CSV Data Locally: Vizmatiq and Its Online Features
Understand which Vizmatiq workflows process local files in your browser and when data is sent to online services.
Updated October 11, 2026. This guide describes Vizmatiq's local and online workflows. It does not compare providers' security or establish regulatory compliance.
Local file analysis
You can import a local CSV or Excel file while signed out, then use manual charts, local SQL, and correlation calculations in your browser. Browser storage still contains real data, so use a trusted device and handle it according to your organization's rules. We do not promise that the entire application works offline.
When data leaves your browser
Vizmatiq processes local CSV and Excel files in your browser when you work without signing in or using online features. Signing in automatically syncs dashboards and your most recently loaded dataset to cloud storage. AI features send prompts and feature-dependent data context, which can include sample rows (with personal data masked by default), statistics, and query results, to our server and Anthropic. A sample can include all rows of a small dataset. Sharing uploads a dashboard snapshot; database and Google Sheets imports use server endpoints. Browser processing alone does not establish suitability for regulated or confidential data. See our privacy policy.
Masking covers recognisable personal data such as names, emails and phone numbers; other values are sent as they are, so AI context is not necessarily anonymous. Avoid sending information you are not authorized to disclose, including in prompts. Auto Mode and natural-language analysis use online AI services; they are not part of a local-only workflow.
Try local analysis
- Start with sample or approved data while signed out.
- Import a local CSV or Excel file.
- Use manual chart building, SQL, or the Correlations page.
- Before signing in, using AI, sharing, or connecting an external source, review the associated data transfer.
Local processing can reduce transfers for this particular workflow. It does not remove the need to assess device security, permissions, or applicable requirements. Neither a browser-based product nor a cloud service is automatically suitable or unsuitable for confidential data.