What spreadsheet file formats can I open?

Our viewer supports all common spreadsheet formats: Excel files (XLSX from Excel 2007+, XLS from older Excel versions), CSV (comma-separated values), TSV (tab-separated values), and ODS (OpenDocument Spreadsheet from LibreOffice/OpenOffice). XLSX is the most common modern format with full support for multiple sheets, formulas, formatting, and charts. CSV and TSV are simple text formats containing only data (no formatting or formulas) but work universally. When opening files, the viewer automatically detects the format and displays the data appropriately. For best compatibility and feature support, use XLSX format for complex spreadsheets with formulas and formatting.

Can I edit spreadsheet data and formulas?

Yes! The viewer functions as a basic spreadsheet editor. Click any cell to edit its content—type text, numbers, or formulas starting with equals sign (e.g., =SUM(A1:A10), =A1*B1). Common functions are supported: SUM, AVERAGE, COUNT, IF, VLOOKUP, and basic arithmetic. Changes are made in your browser only—the original file remains unchanged until you download the modified version. For complex Excel features (macros, pivot tables, advanced charts, conditional formatting), use Excel or LibreOffice. This viewer is perfect for quick edits, data entry, formula calculations, or viewing spreadsheets without installing software. All processing happens client-side for complete privacy.

How do I sort and filter spreadsheet data?

Click on any column header to access sorting and filtering options. Sorting arranges data alphabetically (A-Z or Z-A for text), numerically (smallest to largest or reverse for numbers), or chronologically for dates. Filters let you show only specific data: text filters (contains, equals, starts with), number filters (greater than, less than, between), date filters (before, after, between), or custom filters with multiple conditions. Sorting and filtering don't change your data—they just reorganize the view. This is essential for analyzing large datasets, finding specific records, or identifying trends. Clear filters to restore the original view. Filters work per-column and can be combined across multiple columns.

Are my spreadsheet files secure when using this viewer?

Absolutely! All spreadsheet processing happens entirely in your browser using JavaScript. Your Excel or CSV files are never uploaded to any server, transmitted over the internet, or stored anywhere except temporarily in your browser's memory while you work on them. This makes it completely safe to view and edit sensitive data like financial records, customer information, employee data, or proprietary business information. Once you close the browser tab or navigate away, all data is immediately cleared from memory. No server logs, no data retention, complete privacy. Always verify tools claiming client-side processing by checking network activity in browser developer tools.

Can I export the spreadsheet to different formats?

Yes! After viewing or editing, you can export to multiple formats: Excel XLSX (preserves formulas, formatting, multiple sheets), CSV (plain text, data only—best for compatibility), TSV (tab-separated, good for databases), JSON (structured data for programming), or HTML table (for embedding in web pages). When exporting to CSV, choose delimiter (comma, semicolon, tab) and whether to include headers. XLSX export maintains most features, while CSV is universally compatible but loses formulas (calculated values are exported as static numbers). Choose format based on your use case: data exchange (CSV), further editing in Excel (XLSX), or web display (HTML).

What's the maximum file size for spreadsheet viewing?

Since the viewer runs in your browser, limits depend on available device memory (RAM). Most modern computers with 8GB+ RAM handle spreadsheets up to 50-100MB (hundreds of thousands of rows) without issues. Mobile devices with 4GB RAM may struggle with files over 20MB. Very large files (200MB+, millions of rows) might cause browser slowdowns or crashes. For huge datasets, consider splitting into smaller files, using desktop software (Excel, LibreOffice), or specialized data analysis tools. The browser-based approach provides instant access for typical spreadsheets (financial reports, customer lists, inventory) which are usually under 10MB. Performance also depends on formula complexity—many calculated cells slow rendering.

How do I work with multiple sheets in an Excel file?

Excel files often contain multiple sheets (tabs) for organizing related data. In the viewer, sheet tabs appear at the bottom of the spreadsheet—click any tab to switch between sheets. Each sheet is independent with its own data, formulas, and formatting. You can rename sheets, add new sheets, delete sheets (except the last one), or reorder sheets by dragging tabs. Formulas can reference cells in other sheets using syntax like Sheet2!A1 or 'Sales Data'!B5 (quotes needed for sheet names with spaces). Multi-sheet workbooks are great for organizing: raw data on one sheet, calculations on another, summaries on a third. All sheets are included when exporting to XLSX format.

Can I create charts and graphs from spreadsheet data?

Basic charting may be available depending on the viewer implementation. Typically, select your data range (including headers), click 'Insert Chart' or similar button, and choose chart type: column/bar (comparing categories), line (trends over time), pie (parts of a whole), scatter (correlations), or area charts. The viewer generates a visual chart from your data, useful for presentations or quick analysis. However, for advanced charts with custom styling, multiple data series, or complex layouts, use Excel or Google Sheets which offer more charting features. Charts created in the viewer can usually be exported with the spreadsheet or saved as images. Simple charts help communicate data insights more effectively than raw numbers.

What Excel formulas are supported in the online viewer?

Common formulas work in most online spreadsheet viewers: arithmetic (addition, subtraction, multiplication, division), SUM, AVERAGE, COUNT, MIN, MAX, IF (conditional logic), VLOOKUP/HLOOKUP (lookup values), CONCATENATE or text joining with ampersand, DATE and time functions (TODAY, NOW, YEAR, MONTH, DAY), and basic text functions (LEFT, RIGHT, MID, TRIM, UPPER, LOWER). Advanced Excel features may not work: macros (VBA code), array formulas, SUMIFS/COUNTIFS with complex criteria, pivot tables, or specialized financial/statistical functions. When opening Excel files with unsupported formulas, you'll see the last calculated value but can't recalculate. For full formula support, use Excel or compatible desktop software.

How do I freeze rows or columns for easier scrolling?

Freezing (pinning) rows or columns keeps them visible while scrolling through large datasets. To freeze the top row (headers), click the 'Freeze Top Row' option—the header row stays visible as you scroll down through data. To freeze the first column, use 'Freeze First Column'—helpful when the first column contains row labels or IDs. For custom freeze positions, select the cell below and to the right of where you want the freeze, then click 'Freeze Panes'—everything above and to the left of that cell stays fixed. Frozen rows/columns are essential for navigating large spreadsheets while keeping context (headers, labels) always visible. Unfreeze when you need to edit those fixed areas.

Online Spreadsheet Viewer

View and edit Excel, CSV, and other spreadsheet files in your browser. Sort, filter, edit data, and export to multiple formats—no installation required.

Drop spreadsheet here or click to select

Supports CSV, XLSX, and XLS files

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