You shouldn't need a $100/year subscription to open a spreadsheet
XLSX is the standard file format for spreadsheets, but Microsoft charges $99.99/year for Microsoft 365 just to use Excel. Google Sheets is free but struggles with large files, strips formatting, and requires uploading your data to Google's servers.
Viztab opens XLSX files directly in your browser with full formula support, formatting preservation, and no file size restrictions. Your data never leaves your machine.
Full XLSX compatibility, zero compromises
- 370+ formulas supported — VLOOKUP, SUMIF, INDEX/MATCH, pivot-style calculations, and everything in between
- Multiple sheets — switch between tabs just like in Excel
- Handles massive workbooks — open XLSX files with millions of rows that crash Excel itself
- 100% private — your spreadsheet is processed locally, never uploaded to any server
Works everywhere Excel doesn't
Viztab runs in any modern browser — Chrome, Firefox, Safari, Edge. Whether you're on a Chromebook, a shared office computer without Excel installed, or a Linux workstation, you can open XLSX files in seconds. There's also a free desktop app for Windows, macOS, and Linux.
No Microsoft account. No Google account. No signup at all. Just drag your file in and start working.
How it works
Drop your XLSX file
Drag and drop your Excel file into Viztab, or click to browse. Multi-sheet workbooks are fully supported.
View and edit
All your data, formulas, and sheets load instantly. Sort, filter, search, and edit just like you would in Excel.
Save in any format
Export back to XLSX, save as CSV, or keep working in Viztab. Your original file is never overwritten.
Frequently asked questions
Viztab supports over 370 formulas, covering virtually all commonly used Excel functions including VLOOKUP, SUMIF, INDEX/MATCH, COUNTIFS, IF/AND/OR, text functions, date functions, and more. Macros (VBA) are not supported, as they are a security risk and specific to Excel.
Yes. You can edit cells, add formulas, insert rows and columns, and then export the file back as XLSX. You can also save as CSV if that's what you need.
Google Sheets requires you to upload your file to Google's servers and create a Google account. Viztab runs entirely in your browser — your data never leaves your computer. It also handles much larger files: Google Sheets caps at 10 million cells, while Viztab can handle files with tens of millions of rows.
Opening and viewing XLSX files up to 1,000 rows is completely free with no signup. Viztab Pro removes the row limit for users who need to work with larger datasets.
Open your XLSX file now
No Excel, no problem. Viztab opens any spreadsheet instantly, right in your browser.
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