Rust-native OOXML engines with collaboration and agent editing at the core.
WebAssembly for browsers. Headless APIs for servers. Native Rust where you need it.

Features

• Documents, spreadsheets, and slides. Open, edit, render, and save DOCX, XLSX and PPTX files with high fidelity. Native OOXML editing preserves untouched file parts losslessly when round-tripping.

• Agent editing with human review. Review attributed agent edits through tracked changes, inline diffs, and before-and-after previews. Accept or reject changes directly in the editor.

• Real-time collaboration. People and agents edit the same file together, with live cursors and selections. Concurrent changes merge automatically, and offline edits sync when peers reconnect.

• Undo and redo. Navigate editing history and undo accepted agent proposals as a single step.

• Embed or automate. Drop React editors into your app, build on the framework-free JavaScript cores, or use Rust and Python APIs for headless processing and agent workflows.

• Open source and self-hostable. Apache-2.0 licensed, with control over your document storage, deployment, and collaboration infrastructure.

Try it out, or explore the docs for setup, APIs, and format support.

Packages

Documents — .docx

package	registry	what it does
betteroffice-docx	crates.io	typed Rust API for opening, editing, laying out, and saving DOCX documents
@betteroffice/docx	npm	framework-free .docx editor core: parsing, CRDT editing, and page layout in Rust through WebAssembly
@betteroffice/docx-react	npm	drop-in React .docx editor
betteroffice-docx	PyPI	Python API for reading, editing, laying out, and rasterizing DOCX documents

Spreadsheets — .xlsx

package	registry	what it does
betteroffice-xlsx	crates.io	typed Rust API for opening, editing, calculating, rendering, and saving XLSX workbooks
@betteroffice/xlsx	npm	framework-free spreadsheet core powered by the Rust engine through WebAssembly
@betteroffice/xlsx-react	npm	drop-in React spreadsheet editor
betteroffice-xlsx	PyPI	Python API for opening, recalculating, styling, rendering, and saving XLSX workbooks

Presentations — .pptx

package	registry	what it does
betteroffice-pptx	crates.io	typed Rust API for opening, editing, rendering, and saving PPTX presentations
@betteroffice/pptx	npm	framework-free .pptx editor core: slide model, masters, editing, and rendering in Rust through WebAssembly
@betteroffice/pptx-react	npm	drop-in React .pptx editor
betteroffice-pptx	PyPI	Python API for reading, editing, saving, and laying out PPTX presentations

Diagrams (.vsdx, source preview)

VSDX packages build from this repository; see the VSDX guide.

Agent tools

@betteroffice/agents lets agents search, read, edit and preview DOCX, XLSX and PPTX files through a TypeScript SDK or the betteroffice-mcp server.

What to install for which language, with a first example each: npm, crates.io, PyPI.

Benchmarks

Generated by the Benchmarks action; per-document results are on the benchmarks site.

DOCX

Page agreement is reported separately from SSIM.

	BetterOffice (3a49caad)	LibreOffice (26.2.3.2)
Exact page counts	63/63	44/63
Absolute page error	0	57
SSIM	0.8519	0.7694
Scored/total	63/63	63/63
Render time (avg)	430 ms	773 ms
Parse success	100.00%	100.00%

PPTX

	BetterOffice (3a49caad)	LibreOffice (26.2.3.2)
SSIM	0.9170	0.9030
Scored/total	103/103	103/103
Render time (avg)	159 ms	1351 ms
Parse success	100.00%	100.00%

XLSX

	BetterOffice (3a49caad)	LibreOffice (26.2.3.2)
SSIM	0.7661	0.6892
Scored/total	207/208	195/208
Recalc accuracy	99.60%	85.87%
Recalc time (avg)	64 ms	405 ms
Parse success	100.00%	100.00%

For how scores, timings and coverage are measured, see the benchmark methodology.

Structure

• crates/ — the Rust engines
• packages/ — the TypeScript editor packages
• bindings/ — the Python bindings
• e2e/ — browser tests, corpus scenarios, and the shared test harness
• apps/web — betteroffice.dev (Next.js on Cloudflare Workers)
• apps/demo — editor playground
• apps/docs — documentation

Development

bun install
bun run dev:demo     # editor playground; builds the wasm bundles on first run
bun run dev          # betteroffice.dev site (no wasm needed)
bun run dev:docs     # documentation site
bun run rust:check   # fmt + clippy + tests for the engines

Run bun run test:e2e:browser for headless browser tests of all three editors. The E2E guide also covers pinned corpus scenarios, cross-SDK checks, and operation profiles.

Use the Office visual quality harness to export Word, PowerPoint, and Excel references, compare local renders, or refresh the fidelity scores with the manual action.

Contributing

Contributions are welcome. We ask for a one-time signature of the Contributor License Agreement on your first pull request (corporate version).

License

Apache-2.0 — third-party attribution in THIRD-PARTY-NOTICES.md.