Why Use a Free Online Excel Viewer?
Doconut.app is a free, browser-based Excel viewer for anyone who needs to open a workbook and does not have Excel. It takes XLS, XLSX, CSV and ODS, plus the macro and binary variants (.xlsm, .xlsb) and the templates (.xltx, .xltm), up to 20 MB per file. Whether you are checking a financial sheet or verifying a data export, it renders in the browser tab you already have open.
No plug-ins, no account, no install — drop the file on the page and it opens. One thing worth knowing before you read the numbers: a viewer does not recalculate, so what you see is the result Excel stored at its last save.
Secure Browser-Based Preview for Excel Files
Security is a core part of DoconutApp’s design. Every Excel file you upload is handled safely:
| Security Feature | Description |
|---|---|
| Encrypted upload | The file travels to us over HTTPS. |
| Nothing kept | The workbook is deleted from our servers when the viewing session ends. |
| No account | The session is tied to your browser, not to a profile, so there is nothing to sign in to and nothing to delete later. |
This ensures that sensitive financial reports, internal spreadsheets, grades, or business data stay private throughout the viewing session.
Cross-Device Excel Viewing on Any Modern Browser
DoconutApp adapts smoothly to screens of all sizes:
- Works anywhere a modern browser does — laptop, desktop, tablet or phone.
- Responsive UI built for touch, scroll, and tap navigation.
- Clean layout that makes spreadsheets readable even on smaller displays.
You can open Excel files from home, the office, or while traveling — no installations required.
Embed DoconutApp Excel Viewer in .NET Applications
This page is the free viewer, and it stops at viewing: it does not convert files and it has no API of its own. The rendering engine behind it is sold separately as a .NET SDK at Doconut.com, for developers who want the same Excel rendering inside their own application on .NET Framework or .NET Core.
If spreadsheets are the format that keeps stopping you, the Excel viewer is the page worth a bookmark.