How it works
The document is rendered through a layout engine exactly as it would print, and each page or slide is encoded as a WebP image. Fonts, tables, charts and graphics are preserved as they appear.
What converts
Word (DOC, DOCX, DOCM, DOT, DOTX, ODT, RTF, TXT), spreadsheets (XLS, XLSX, XLSM, CSV, ODS, Numbers), presentations (PPT, PPTX, ODP, Keynote), PDFs, HTML pages and CAD drawings (DWG, DXF, DWF).
Why WebP for this
Page renders are large images with a lot of flat white, which WebP handles very efficiently — typically about half the weight of the equivalent JPG render. A twenty-page document stays light enough to serve inline.
Setting DPI
DPI controls the render resolution. 150 is right for screen display; 300 if the images might be printed. Higher settings produce sharper text and proportionally larger files.
The accessibility trade-off
This is the important caveat. A page image contains no selectable text, so it cannot be searched, copied, translated or read by a screen reader. Always offer the source document as a download alongside the images, and write real alt text.