OOXML Viewer | JavaScript Office File Viewer

About the library

Browser-based OOXML rendering.

Rust/WASM parsers and Canvas renderers for DOCX, XLSX and PPTX, with document APIs and ready-to-use viewers.

DOCX, XLSX and PPTX parsing is implemented in Rust and compiled to WebAssembly.

Documents are rendered with the Canvas 2D API. Layout and feature support vary by format and document.

The implementation refers to ECMA-376 / ISO 29500 and related Microsoft documentation where relevant.

Use built-in viewers or document APIs for custom previews, thumbnails and navigation.

Live in this page

Switch formats, navigate pages or slides, and scroll the sheet.

sample-1.docx live · WASM

Format documentation: DOCX · XLSX · PPTX

What it renders

Selected supported features for each format are listed below. See the README for the full matrix; complex documents may still differ from Office.

DOCX.docx

Paginated layout with headers, footers & sections
Complex tables with borders, fills & merged cells
Adaptive large-image display, optional TIFF decoding and DrawingML shapes with image fills
CJK typography: ruby, vertical writing & line grids
Math equations, classic charts and optional ChartEx / 3-D / Region Map rendering
Tracked-change markup, text / element context, progressive virtualized scroll, zoom, find & links

XLSX.xlsx

Multi-sheet workbooks with frozen panes & outlines
Cached formulas, dates and Excel number formats
Classic charts, optional ChartEx / 3-D / Region Maps, sparklines and conditional formatting
Adaptive large-image display, optional TIFF decoding, drawing shapes and styled slicers
Pivot metadata, comments and CJK cell text
Multiple-area selection, range / element context, TSV copy, find, internal links, zoom & drag-resize

PPTX.pptx

Slide master and layout inheritance
Preset / custom shapes, groups and SmartArt text
Gradient fills, picture effects and 3D shading
Classic combo and stock charts, plus optional ChartEx / 3-D / Region Maps
Adaptive large-image display, optional TIFF images, embedded fonts, math and media
Table text selection, text / element context, progressive virtualized scroll, zoom, find & links

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