100% Private
Your data files never leave your device. No uploads, no server processing, no data retention.
Free Online Spreadsheet & Data Viewer
Open CSV, Excel, SQLite, Parquet, and DBF files directly in your browser. Preview tabular data with pagination, column inspection, and automatic formatting — no software needed, 100% private.
🔒 100% Private
📊 5 Data Formats
⚡ Instant Preview
Spreadsheet & Data Viewers
Choose the viewer for your data file format
CSV Viewer
View comma-separated values files with automatic delimiter detection (CSV, TSV, TXT) and table preview.
Open CSV Viewer →Excel Viewer
View Excel spreadsheets (XLSX/XLS) with multiple worksheets, formatting, and large file support.
Open Excel Viewer →SQLite Viewer
Browse SQLite databases — view tables, schema, and data. Run queries with sql.js entirely in-browser.
Open SQLite Viewer →Parquet Viewer
Inspect Apache Parquet columnar data files with schema, metadata, row groups, and data preview.
Open Parquet Viewer →DBF Viewer
View dBASE database files with encoding detection. Commonly used alongside Shapefiles for GIS data.
Open DBF Viewer →Open Data Files Without Installing Software
DataViewer parses your data files entirely in the browser using optimized JavaScript libraries. There's nothing to download — just drag and drop your file.
Our data viewers are ideal for:
- Quick data preview — Instantly inspect CSV or Excel files without opening a full spreadsheet app
- Database inspection — Browse SQLite tables and schema without a database client
- Big data formats — Read Parquet columnar data without setting up Spark or Pandas
- Legacy data — Open DBF files from GIS, accounting, or archival systems
- Data engineering — Validate file contents before loading into pipelines
Features Across All Data Viewers
- Tabular PreviewClean table rendering with rows, columns, and pagination
- Delimiter DetectionCSV viewer auto-detects commas, tabs, semicolons, and pipes
- Multi-Sheet SupportExcel viewer handles workbooks with multiple worksheets
- Schema InspectionView column types, schema, and metadata for Parquet and SQLite
- Encoding SupportDBF viewer detects and handles multiple character encodings
- 100% Client-SideAll processing happens locally — files never leave your device
Why Use DataViewer for Data Files?
The fastest way to preview spreadsheets and databases online
Instant Processing
Files up to 100MB parse in seconds using optimized in-browser JavaScript libraries.
Smart Detection
Auto-detects delimiters, encodings, sheet structures, and column types for hassle-free viewing.
Pro Analytics
Upgrade to Workspace Pro for charts, pivot tables, data profiling, AI insights, and export to PDF.
Data Viewer FAQ
What data formats are supported?
We support CSV (with automatic delimiter detection for commas, tabs, semicolons), Excel (XLSX and XLS with multiple sheets), SQLite database files, Apache Parquet columnar files, and DBF (dBASE) database files.
What's the maximum file size?
CSV and DBF files up to 50MB, Excel up to 50MB, SQLite and Parquet up to 100MB. These limits ensure smooth performance in the browser.
Can I view an Excel file with multiple sheets?
Yes! The Excel viewer fully supports multi-sheet workbooks. You can switch between sheets using a tab interface to browse each one.
Can I run SQL queries on my data?
The SQLite viewer supports browsing tables and schema. For advanced SQL queries on any data file, try Workspace Pro's AI-powered "Ask SQL" feature which converts natural language questions into SQL.
How is my data kept private?
All file processing happens 100% in your browser using JavaScript. Your files are never uploaded to any server. We have no way to see or access your data.
Can I create charts from my data?
Chart creation is available in Workspace Pro, which offers both basic charts (bar, line, pie) and advanced visualizations (heatmaps, treemaps, sankey diagrams, radar charts, and more).