A CSV file contains raw data — rows of values separated by commas or another delimiter — with no formatting attached. Converting it to PDF means choosing how that data is rendered: as a table, as a text listing, or via a spreadsheet application. The choice determines whether you get a formatted table or an unstyled column of comma-separated text.
Why spreadsheet applications produce better output
Opening a CSV in a spreadsheet application like LibreOffice Calc or Microsoft Excel and then exporting to PDF produces a formatted table: column widths adjusted to fit the data, gridlines visible, rows clearly separated. The application reads the CSV, interprets the columns, and renders them as a proper spreadsheet before exporting.
Converters that treat a CSV as a text file — passing it directly to a text-to-PDF engine — produce a PDF of comma-separated lines. The data is there, but unformatted and difficult to read.
Using Filum's CSV to PDF tool
Filum's CSV to PDF tool sends the file to a LibreOffice Calc server, which opens it as a spreadsheet, auto-fits column widths to the data, and exports a PDF with gridlines. The result is a clean, readable table.
LibreOffice Calc automatically detects the four most common delimiters: comma, semicolon, tab, and pipe. Most CSV files open correctly without any manual delimiter configuration. If your CSV uses a less common delimiter and the columns are not aligned correctly in the output, re-exporting from your original source with a comma delimiter will resolve it.
The tool requires an upload — LibreOffice runs server-side. The file is sent over an encrypted connection, converted, and immediately deleted. No account is required.
What is not preserved
CSV files contain only data — no colours, no fonts, no merged cells, no formulas, no named ranges. Whatever formatting your original Excel or Google Sheets file had does not survive in a CSV export. The PDF output will use LibreOffice Calc's defaults: a clean sans-serif font, standard margins, and visible gridlines.
If you need formatted output that reflects Excel-specific styles, export the file as XLSX rather than CSV and use a spreadsheet-to-PDF converter instead. XLSX preserves colours, fonts, merged cells, and explicit column widths. The Filum Excel to PDF tool accepts XLSX files and preserves that formatting via LibreOffice Calc.
Large CSV files
CSV files with thousands of rows produce multi-page PDFs. LibreOffice Calc handles the full file, though very large files (10,000+ rows) may take 15–30 seconds to convert. There is no row limit; the conversion completes for any size file that LibreOffice can open, which covers all standard CSV sizes.
If the goal is to share a summary rather than the complete dataset, filtering or pivoting the data before conversion produces a more useful PDF. A full export of a large dataset is often better shared as a CSV or XLSX file rather than a PDF.