Is the 65,536-row limit a problem?

No — that's the old format's own limit; save as .xlsx to grow past it.

Never. Only the data and formulas are read.

How much does it cost?

You can open your file, convert it and check or change everything in the studio before you pay anything. Downloading the finished file is part of every MojoPDF plan — start with the 7-day trial for $1 and cancel any time.

Is it safe to use XLS Viewer here?

Yes. Your file travels over an encrypted connection and stays private to you — nobody else can open it. Projects you save are kept in your account until you delete them, and download links we email you expire after 7 days.

Excel Tools

XLS Viewer

Open old Excel .xls workbooks from 1997–2003 on any device — every sheet and formula, ready to read, edit or save as .xlsx.

Drop an .xls file

or browse from your device — Excel 97–2003 workbooks

Private & secure· No Excel needed· Save as .xlsx

Read old .xls workbooks anywhere

Archives, accounting exports and government downloads still arrive as .xls, which phones and many apps refuse. The XLS viewer reads the old binary workbook, every sheet with its values and formulas, and opens it in Mega Excel Studio. Sort, filter and search it, fix a figure, and save a modern .xlsx (no more Compatibility Mode), a PDF to print or a CSV to import.

Every sheet

Values and formulas.

Save as .xlsx

Out of the 2003 format.

Any device

Phone, Chromebook, Mac.

Frequently asked questions

Many viewers only read .xlsx. Here the .xls is converted as it opens.