This is a browser-based Excel editor built for quick spreadsheet tasks. No downloads, no account creation, and your files stay completely private on your device.
We created this tool for people who need to edit Excel files online without installing software. Whether you're checking data on a shared computer, making quick edits on the go, or just prefer working in the browser, this editor handles the essentials.
The editor runs on Univer, an open-source spreadsheet engine designed for modern web applications. Unlike basic online editors, Univer provides a full-featured spreadsheet experience with professional-grade capabilities.
We chose Univer after testing multiple spreadsheet libraries because it handles complex Excel files reliably and offers features you'd expect from desktop software. The engine processes everything locally in your browser, which keeps your data private and makes the editor fast.
After working with spreadsheets for years, we noticed a gap. Desktop Excel requires installation and licensing. Google Sheets needs a Google account and internet connection. Lightweight online editors are too basic for real work.
We wanted something in between: a full-featured editor that works in any browser, handles actual Excel files, and doesn't compromise on privacy. When we discovered Univer's open-source project, we realized we could build exactly that.
The result is a tool we use ourselves. It opens files our clients send us, handles financial models with hundreds of formulas, and works on hotel WiFi when we're traveling. If you need similar flexibility, this might work for you too.
Every file you open is processed entirely in your browser. When you upload an Excel file, it never reaches our servers. The Univer engine parses your data using JavaScript that runs on your own computer.
This architecture means we physically cannot access your spreadsheets. Your financial records, customer data, business plans, or personal information stays on your device. We built it this way deliberately, because privacy isn't optional when you're working with sensitive data.
The trade-off is that we can't offer cloud storage or automatic backups. When you close the browser tab, your work is gone unless you've downloaded it. This is intentional - no cloud storage means no data breach risk.
We do use standard analytics to understand which features people use most, but this tracks clicks and page views, not your actual spreadsheet content. You can verify this yourself by opening your browser's network tab and watching what data gets sent (spoiler: none of your Excel data does).
We're a small team that builds web tools for everyday tasks. This editor started as an internal project when we needed to check client spreadsheets without downloading them, and it turned out other people had the same problem.
The tool is maintained actively. We test it with files from our own work, fix bugs when users report them, and add features that make practical sense. Recent updates included better formula error handling and faster loading for large files.
We keep this tool free because the Univer library is open source, and we benefit from the broader community's improvements. When Univer adds new features or fixes compatibility issues, we integrate those updates here.
The editor uses React 18 for UI rendering, which keeps the interface responsive even with large spreadsheets. RxJS handles state management and ensures formula calculations propagate correctly across dependent cells.
Chart rendering uses ECharts, a mature visualization library that handles different chart types reliably. When you create a chart, ECharts generates an interactive SVG that updates in real-time as you edit the underlying data.
The Univer engine itself is modular. We load the core spreadsheet functionality, plus the sheets-core preset for Excel compatibility and sheets-drawing for shapes and objects. This modular approach keeps the initial download size reasonable while still providing comprehensive features.
All dependencies load from unpkg CDN, which means the editor works from a single HTML file without a build step. This architecture makes it easy to deploy anywhere and ensures consistent behavior across different environments.
Download your work regularly. The editor doesn't auto-save because there's nowhere to save to - everything stays in your browser's memory until you download it.
For files larger than 5 MB, expect a few seconds of loading time. The browser needs to parse the entire Excel file structure in JavaScript, which takes longer than native desktop applications.
If a formula isn't calculating correctly, check the cell references first. Excel files sometimes use absolute references ($A$1) or sheet references (Sheet2!A1) that need to be formatted exactly right.
The editor works offline after the initial page load. If you're on a plane or have spotty internet, you can still open and edit files as long as the page loaded completely before you went offline.
Found a file that doesn't open correctly? Hit a bug with a specific formula? Have a suggestion for a feature that would actually be useful?
Send us a message. We respond to every email and fix issues when we can. The tool gets better when people tell us what's broken or missing. Real feedback from real use cases helps us prioritize what to work on next.