Case study · Custom Systems
Spreadsheet viewer (free tool)
Open and edit Excel files with no Excel. A free tool on our site: open .xlsx, .xls, .ods and .csv files in the browser, edit them with working formulas, and save them back. Nothing is uploaded.
- Market
- International
- Industry
- Our own free tool
- Launched
- October 2026
The problem
Someone sends you a spreadsheet and you don't have Excel to hand, or you're on a borrowed computer and don't want to upload a private file to a website.
What we built
Drop a file on the page and it opens as a grid, with every sheet in tabs and a formula bar. Change a number and every formula recalculates, including references to other sheets. Sort, filter, add and delete rows, then save as Excel or CSV. It all runs in the browser, so the file stays on your computer.
Features
- Opens .xlsx, .xls, .ods and .csv
- Over 280 Excel functions
- Sheet tabs and a formula bar
- Sort, filter, add and delete rows
- Save as Excel or CSV
- Nothing is uploaded
See it working
Built with: Next.js · SheetJS · fast-formula-parser
Want a system like this for your business?
Tell us how your business runs today. We'll show you what we'd build on a free 30-minute call.