Is my spreadsheet uploaded to a server?

No. SheetJS, html2canvas, and jsPDF all run entirely in your browser. Your data never leaves your device — confirm in your browser's Network tab. This means salary spreadsheets, budgets, customer lists, financial models, and any other confidential workbooks can be converted without third-party exposure.

Are formulas preserved as values or formulas?

Formulas are converted to their computed values. The PDF shows the cell display text exactly as Excel would render it, including formatting like currency symbols, percentages, and date formats applied at save time. The underlying formula is not visible in the PDF — that is the standard behaviour for any "save as PDF" workflow because PDFs are visual documents, not spreadsheets.

Are charts, sparklines, and pivot tables converted?

Only cell data is converted. Charts (line, bar, pie), sparklines, pivot tables, slicers, embedded images, and shapes are not rendered into the PDF. SheetJS focuses on tabular cell content. If you need charts in the output, take a screenshot of the chart in Excel and use ToolMint's image-to-PDF tool, or save the workbook as PDF directly from Excel which preserves visuals.

Is conditional formatting preserved?

Basic cell text formatting (bold, italics, font colour, background colour from styles) is preserved when SheetJS produces the HTML table. Complex conditional formatting — data bars, colour scales, icon sets — is not preserved because SheetJS converts to a static HTML representation rather than re-evaluating Excel's rule engine. For exact conditional-formatting fidelity, use Excel's built-in Save as PDF.

How does the tool handle workbooks with many sheets?

Every worksheet in the .xlsx file is converted and stacked into one PDF, with the sheet name shown as a heading above its table. There is no built-in option to select specific sheets — to skip sheets, delete or hide them in Excel before exporting, or split the workbook into per-sheet files first. Hidden sheets are still included in the output, so unhide-then-delete is the simplest way to exclude them.

What is the file size limit?

The tool accepts .xlsx files up to 50 MB. The practical limit is browser memory: a workbook with hundreds of thousands of rows across many sheets can exhaust memory during the SheetJS read or html2canvas raster step on lower-spec devices. For very large datasets, export each sheet as CSV and use the CSV-to-Excel + Excel-to-PDF flow per sheet, or split the workbook by year, region, or customer before converting.

Excel to PDF Online Free - Convert Excel spreadsheets to PDF

How It Works

1

Upload

Select or drag & drop your Excel workbook (.xlsx). The file is read into your browser's memory only — nothing is uploaded. Only the Open XML .xlsx format (Excel 2007 and later) is supported; older .xls files must be resaved as .xlsx in Excel or LibreOffice Calc before converting.

2

Convert

SheetJS reads each worksheet in your browser and converts cell ranges into HTML tables, one section per sheet. The combined HTML is rendered to a canvas with html2canvas at 2× scale for sharp text, then drawn into a PDF page-by-page using jsPDF in a Web Worker. Default landscape orientation handles wide tables better than portrait.

3

Download

Save the multi-page PDF directly to your device. Each worksheet appears as its own labelled section. Choose page size (A4, Letter, Legal), orientation (landscape or portrait), and margin before converting so wide grids fit without truncation.

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