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. DOCX hosts can place explicit undo boundaries and choose automatic typing coalescence or manual grouping across multiple edits.

• 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.

• Host-controlled PPTX editing. PPTX hosts can intercept saving, flush accepted input, query slide content under the pointer, group undo with explicit boundaries, and reposition comments.

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

• Host-controlled DOCX saving. Intercept Save before export and await pending editor input before reading, changing, or persisting the document.

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, image insertion, shape ordering, 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 support is available from source and is not yet published.

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

Benchmarks

Generated by the Benchmarks action.

DOCX

Page agreement is reported on its own because a document either paginates as Word does or it does not; SSIM cannot express that.

	BetterOffice (0.2.1)	BetterOffice (e8ce123f)	LibreOffice (26.2.3.2)
Exact page counts	48/63	63/63	45/63
Absolute page error	32	0	56
SSIM	0.7540	0.8368	0.7749
Scored/total	63/63	63/63	63/63
Render time (avg)	546 ms	527 ms	788 ms
Parse success	100.00%	100.00%	100.00%

PPTX

	BetterOffice (0.1.1)	BetterOffice (e8ce123f)	LibreOffice (26.2.3.2)
SSIM	0.8667	0.8924	0.9043
Scored/total	88/103	103/103	103/103
Render time (avg)	205 ms	144 ms	1310 ms
Parse success	100.00%	100.00%	100.00%

XLSX

	BetterOffice (0.2.1)	BetterOffice (e8ce123f)	LibreOffice (26.2.3.2)
SSIM	0.7002	0.7660	0.6901
Scored/total	205/208	207/208	204/208
Recalc accuracy	68.28%	99.60%	85.87%
Recalc time (avg)	70 ms	89 ms	466 ms
Parse success	99.52%	100.00%	100.00%

For scoring, timing, coverage, and limitations, 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. The XLSX and PPTX JavaScript cores expose opt-in operation timings; the native XLSX facade also reports edit stage timings.

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.