The million-row problem
If you work with large datasets — server logs, financial transactions, sensor data, CRM exports — you've hit the wall. Excel hard-caps at 1,048,576 rows. Google Sheets slows to a crawl past 100,000. Even paid tools like Tableau require complex setup for data this size.
You shouldn't need to learn Python or spin up a database just to look at your data. You need a spreadsheet that can handle it.
How Viztab handles millions of rows
- No row limit — open files with 1 million, 5 million, or 10 million+ rows without any artificial caps
- Instant scrolling — virtualized rendering means you can jump to row 5,000,000 as fast as row 5
- Fast import — import a 2 GB CSV in under 10 seconds with streaming parsing
- Full spreadsheet features — sort, filter, search, and apply 370+ formulas across your entire dataset
Viztab vs. the rest
| Feature | Excel | Google Sheets | Viztab |
|---|---|---|---|
| Max rows | 1,048,576 | ~200,000 usable | 10,000,000+ |
| 2 GB CSV import | Crashes / truncates | Refuses to open | Under 10 seconds |
| Scrolling at 1M rows | Severe lag | Not possible | 60 fps, zero lag |
| Privacy | Local file | Uploaded to Google | Local, never uploaded |
| Cost | $99.99/year | Free | Free (1K rows) / Pro |
How it works
Import your file
Drag in a CSV, TSV, or XLSX file of any size. Viztab streams and indexes it for instant access.
Explore millions of rows
Scroll, sort, filter, and search across your entire dataset with zero lag. Jump to any row instantly.
Analyze and export
Apply formulas, compute aggregates, then export the results as CSV or XLSX.
Frequently asked questions
Viztab has been tested with datasets exceeding 10 million rows. The practical limit depends on your device's available memory, but it routinely handles files that are 10x larger than what Excel or Google Sheets can manage.
Excel loads the entire file into memory and renders all cells upfront. This approach doesn't scale past about 1 million rows. Viztab uses virtualized rendering and streaming parsing, only processing and displaying the rows you're actually looking at.
Yes. Viztab's formula engine supports over 370 functions including SUMIF, COUNTIFS, VLOOKUP, and more. Formulas are computed efficiently even across very large ranges.
Viztab is optimized to work well on standard laptops and desktops. A machine with 8 GB of RAM can comfortably handle multi-million-row files. For the largest datasets (10M+ rows), 16 GB is recommended.
Stop fighting row limits
Viztab handles the files that crash everything else. Try it now with your biggest dataset.
Open Viztab