Excel To PDF converts the workbook with a headless LibreOffice soffice process using the calc_pdf_Export filter, applying that sheet's own page layout rather than repaginating it.
A spreadsheet wider than the printed page's usable width has its right-hand columns pushed onto separate pages rather than automatically shrunk to fit. Excel text getting cut off when printing / saving as PDF - Microsoft Q&A
Excel To PDFExcel To PDF Cutting Off Columns
Open the Excel file and select the Page Layout tab.
Choose the Fit to Width option in the Scale to Fit group.
Set the orientation to landscape if the sheet remains too wide.
Save the workbook before uploading it for conversion.
Checking Column Visibility in the Output
Upload the modified Excel file to the conversion form.
Download the resulting PDF file.
Open the PDF and scroll to the right edge of the first page.
Compare the visible columns against the original spreadsheet layout.
Continue with Fix Blank Extra Pages or Export All Sheets.
Frequently Asked Questions about Fix Excel to PDF Cutting Off Columns
How do I prevent columns from splitting across pages?
Select the Fit to Width option in the Page Layout tab before saving the file.
Where do I find the page orientation setting?
Open the Page Layout tab and choose the orientation dropdown.
How do I verify the conversion worked correctly?
Open the downloaded PDF and check the rightmost column for visibility.
What should I do if the PDF still looks cut off?
Adjust the column widths in Excel and save the file again.