XLSX Viewer
Open an .xlsx workbook to browse every sheet as a table, with dates and percentages shown as they should be.
- All sheets
- Dates & percentages
- Sort & search
- No upload
Drop an Excel (.xlsx) file here. CSV, TSV, XLSX and Parquet all work.
What is an XLSX viewer?
XLSX is the Excel workbook format: a ZIP package of XML files holding the sheets, shared text and cell formats. Without Excel or another spreadsheet program you cannot read it, and many online viewers upload it to a server first. This viewer opens the file in your browser, lists every sheet (including hidden ones), shows dates, times and percentages using the cell formats, shows each formula’s last calculated value, and lets you sort, search and export any sheet to CSV, JSON or Markdown.
How to open an XLSX file
- Choose Open File and pick the .xlsx or .xlsm file, or drag it onto the page.
- Switch between sheets with the tabs above the table.
- Sort, search and click cells to inspect values and column stats.
- Export the current sheet, or all sheets, as CSV, JSON, Excel or Markdown.
Good to know about Excel files
- Formulas show their last calculated value, as saved by Excel. If a file was never opened in Excel, the formula text is shown instead.
- Hidden sheets are listed and marked.
- Merged cells show their value in the top-left cell only.
- Old .xls files (Excel 97–2003) need to be saved as .xlsx first.
Why use this XLSX viewer
- Search, sort and inspectSort any column, search every cell, click a cell to see its full value, and get column stats: type, blanks, unique values, min, max, sum and average.
- Handles large filesOnly the rows on screen are drawn, so files with hundreds of thousands of rows scroll smoothly. Search and sort the whole file instantly.
- Export what you needDownload the data, or just the rows matching your search, as CSV, TSV, JSON, Excel or a Markdown table.
- Private by designThe file is read by your browser and never uploaded, so customer lists, payroll exports and financial data stay on your computer.
Files you can open
| Format | Extensions | Supported |
|---|---|---|
| CSV / TSV | .csv, .tsv, .txt | Comma, semicolon, tab or pipe; UTF-8, UTF-16 or Windows-1252 |
| Excel workbook | .xlsx, .xlsm | All sheets, cached formula values, date and percent formats |
| Apache Parquet | .parquet | Snappy, Gzip, Zstd, Brotli and LZ4; schema and row groups |
Common uses
- No Office installed. Read spreadsheets on a Chromebook, Linux or a work laptop without Excel.
- Email attachments. Check an attachment without opening it in a desktop app.
- Confidential data. Payroll and finance sheets never leave your computer.
- Quick checks. Count rows, find blanks and check totals in seconds.
Related tools: CSV to JSON, JSON to CSV, JSON viewer and HTML table to Markdown.
Example: a sales workbook
Open a workbook with Sales and Lookup sheets. Dates such as 46082 are shown as 2026-03-01 and 0.25 formatted as a percentage shows as 25.0%.
What to expect from the result
Read-only. Charts, images, colours and conditional formatting are not shown, only cell values. .xls (BIFF) and .ods files are not supported.
XLSX Viewer questions
How can I open an XLSX file without Excel?
Open it here in your browser. Every sheet appears as a table, and you can export it as CSV or a new .xlsx.
Are formulas calculated?
The viewer shows the value Excel saved for each formula, which is what you see in Excel. Formulas are not recalculated.
Does it open .xls files?
No, only .xlsx and .xlsm. Save old .xls files as .xlsx in Excel, LibreOffice or Google Sheets first.
How large a file can I open?
Files of several hundred megabytes open on most computers, limited by your browser’s memory. Rows are drawn as you scroll, so large tables stay responsive.
Is my file uploaded?
No. The file is opened and processed by your browser on your own device. Nothing is sent to a server and the page works offline once loaded.