XLSX Viewer Convert
Open an Excel workbook in your browser: switch sheets, search, sort by any column and see the formulas behind cells.
XLSX Viewer is a free online tool that open an Excel workbook in your browser: switch sheets, search, sort by any column and see the formulas behind cells. It runs entirely in your web browser using JSZip, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free: no account, no quota, no watermark
- Category
- Convert
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- JSZip
- Settings
- 1
- Works offline
- Yes, after the first visit
About XLSX Viewer
Sometimes you just need to look inside a spreadsheet: a report someone sent, an export you want to sanity-check, a file on a machine without Excel. This opens the workbook right here, unzips it in memory and turns every worksheet into a grid with column letters, row numbers and sticky headers. Type to search across every cell, click a column letter to sort, and hover a cell with a colored edge to read the formula behind it. Rows render in pages of 200 as you go, so a sheet with a hundred thousand rows stays responsive. It is a data viewer, not an editor: merged cells, colors, charts and images are not drawn.
How to use it
- Drop an .xlsx file on the page, or click to choose one.
- Switch sheets with the tabs above the grid. Hidden sheets are shown too, marked as hidden.
- Search, sort by clicking a column letter, and tick the box if the first row holds column names.
- Download the current sheet as CSV, or copy it as tab-separated text to paste into another app.
The one setting
| Setting | What it does | Default |
|---|---|---|
| First row holds the column names | On or off. When on, the first row is shown as column headings under the column letters and left out of sorting. | Off |
Under the hood
| Runs on | JSZip: unzips the workbook; plain JavaScript turns each sheet into the grid |
| Controls | First row holds the column names |
Questions
Can I edit the spreadsheet here?
No. This reads and shows what is in the file; it does not write. Use the XLSX to CSV tool if you want the data out of the workbook, then edit it wherever you like.
Why do formula cells show an old value?
Excel saves the result of each formula next to the formula itself, and this shows that saved result. Nothing is recalculated, so if a file was written by a script that skipped the results, those cells will be empty. Hover the cell to see the formula.
Why is a sheet marked as hidden?
The workbook hides it in Excel. It is shown here anyway, marked as hidden, because a viewer that skipped it would give you an incomplete picture of the file.
Why do dates look different from Excel?
Dates are shown as ISO values like 2026-09-05 or 14:30:00 rather than in whichever regional format the workbook used. It is unambiguous, sorts correctly, and does not depend on your locale.
Can it open .xls or .ods files?
No. It reads the .xlsx, .xlsm and .xltx formats Excel has used since 2007. Save older .xls files and OpenDocument .ods files as .xlsx first.
How large a file can it open?
There is no site limit; the workbook is unzipped in your device's memory. Hundreds of thousands of rows are fine on a laptop. Search and sort work across the whole sheet, not just the rows on screen.
Can I use it full screen, or keep a copy offline?
Yes to both. "Full screen" above the tool fills the whole screen (Esc leaves it). "Save as HTML" writes this one tool to a single self-contained file that opens from your own disk without a connection. For everything at once there is a desktop app for Windows, macOS and Linux with all 312 tools inside it.