Is this XLS viewer free?

Yes. It runs in your browser for free and needs no registration or installation.

Are my .xls files uploaded?

No. Files you open from your device stay on your device. Only public sample files come from the server.

What is the difference between XLS and XLSX?

.xls is the legacy binary Excel format used before 2007. .xlsx is the modern XML-based format. For modern files, use the XLSX viewer.

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XLS Viewer

Free online XLS viewer for legacy Excel files. Open .xls spreadsheets directly in your browser without uploading them.

.xls

Simple XLS Spreadsheet

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Tool usage guide

About this file format

.xls is the legacy binary spreadsheet format used by Microsoft Excel before the 2007 XML-based .xlsx format. It stores worksheets, formulas, formatting, and charts in a proprietary Binary Interchange File Format (BIFF) structure.

XLS Viewer

About this file format

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XLS Viewer

Overview

When to use

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