Genoffice

GenOffice is a free, open-source alternative to Microsoft Office for macOS, Windows and Linux. It opens and saves native .docx, .xlsx and .pptx files, edits PDF, Markdown and HTML, and puts an AI agent next to every document — not a chat box bolted on the side, but an editor that reads the file, makes the change, and shows you exactly what it touched.

• Real formats, byte-preserving. Only what you edit is rewritten. Everything else in the file survives byte-for-byte, so documents keep working in Word, Excel and PowerPoint.
• AI you can review. Edits land as tracked changes and diffs with one-click rollback. Spreadsheets get live formulas, not pasted numbers. Decks and pages are generated onto the canvas and stay fully editable.
• Local by design. Files open, edit, save and convert on your machine. PDF → Word / Excel / PowerPoint, Markdown → Word and HTML → Word all run on-device. Only the AI calls leave the machine, to the provider you choose.
• Your keys or none. Sign in with Genspark and skip keys, or bring your own key for Claude, OpenAI, Gemini, DeepSeek, Kimi, GLM, Qwen, Doubao, MiniMax, Grok, Mistral, OpenRouter, Requesty, or any OpenAI-compatible endpoint, local servers included.
• Scriptable and agent-ready. The app ships a genoffice command line and a skill for Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf, so a coding agent can create, convert, read and edit real Office files on your machine without opening a window.

Get it: macOS (Apple Silicon and Intel) · Windows (x64 and Arm) · Linux (deb, rpm, AppImage) — details and requirements in Download.

Demo

Six apps, one AI panel, and a command line for your coding agent. Every screenshot is the real app on macOS, with the AI driven from the prompt you can read in the panel.

1 · Docs — open and edit .docx with an AI you can review

2 · Sheets — .xlsx with live formulas and charts, not pasted numbers

3 · Slides — from a prompt to a .pptx deck

4 · PDF — edit PDF text in place, convert PDF to Word on-device

5 · HTML — an AI page and UI builder, design brief first

Say what the page is for and who it is for. The AI proposes a design brief first — hook, palette, typography and style directions — then builds a single self-contained .html file against those tokens.

6 · Markdown — a block editor over plain .md, with Ask AI

7 · CLI — your coding agent drives GenOffice, on your machine

GenOffice ships a genoffice command line and an agent skill. Install the skill and Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode or Windsurf can create, convert, read and edit real Office files through the same engines as the apps, without opening a window.

Why GenOffice

• Open source, Apache-2.0, built in the open on GitHub.
• Yours to run. Native apps for macOS, Windows and Linux; files stay on your disk and every edit, save and conversion happens on your machine.
• Real Office files. Native .docx, .xlsx and .pptx, byte-preserving: the parts of a file you did not touch are copied exactly as they were.
• An AI that edits the document itself. Tracked changes in Docs, live formulas and charts in Sheets, slides drawn onto the canvas, every AI turn a snapshot you can roll back.
• Your model, your key. Sign in with Genspark, or bring a key for Claude, OpenAI, Gemini, DeepSeek and more, local servers and any OpenAI-compatible endpoint included.
• PDF done properly. Edit text inside the page, and convert PDF to Word, Excel or PowerPoint on-device, with system OCR for scans.
• Markdown and HTML too, with the same AI panel and local export to Word.
• Scriptable. A genoffice command line and an agent skill put every engine at the service of Claude Code, Codex, Cursor and other coding agents, still on-device.
• Free, for individuals and teams alike.

AI backends

Sign in with Genspark and there is nothing to configure: model calls route through the Genspark proxy (Claude, GPT and Gemini families) and the agents get web and image search, image generation, and image/audio/video analysis.

Or bring your own key. Settings → AI lists Claude, OpenAI, Gemini, DeepSeek, Kimi, GLM, Qwen, Doubao, MiniMax, Grok, Mistral, OpenRouter, Requesty and OpenCode Zen/Go, plus a custom slot for any OpenAI-compatible endpoint (base URL + key), including local model servers. Search and media have their own per-capability providers under AI Media & Search: Serper or Tavily for web search, and OpenAI, Gemini, Doubao/Seedream, GLM, Grok, Qwen, MiniMax or any OpenAI-compatible images endpoint for image generation and image/video analysis.

The whole suite ships light, dark and system themes. Themes only change what is on screen: exports, prints and saved files always keep the document's own colors.

Command line and agent skill

Everything the apps can do to a file, the genoffice command line can do from a terminal: inspect, convert, create, read and edit Word, Excel, PowerPoint, PDF, Markdown and HTML on the same engines, headless. It installs with GenOffice, needs no runtime of its own, and never sends a document anywhere. Paired with the bundled agent skill, it turns a coding agent into a document worker that produces real Office files instead of Markdown approximations.

Works with: Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf out of the box, and any other agent that reads skills.

Install the skill

Then start a new chat and ask for a document. The skill teaches the agent when to reach for genoffice, how to read a file before editing it, and how to check its own work.

Quickstart from the terminal

genoffice --version
genoffice info report.docx --json                  # headings and blocks; or sheets, slides, pages
genoffice convert report.md --to pdf               # md/html/docx/xlsx/pptx → pdf, pdf → docx/xlsx/pptx, …
genoffice create --type docx --from notes.md --out notes.docx
genoffice create --type xlsx --from table.json --out sales.xlsx   # "=SUM(B2:B9)" cells stay live formulas
genoffice docs read report.docx --range 0-9 --json # then `docs apply --ops edits.json` edits in place
genoffice render report.docx --out shots/          # one PNG per page, to look at what you made
genoffice open sales.xlsx                          # hand the result to the editor

Every command prints a one-line summary, or a single JSON object with --json. Edits are atomic: a rejected op leaves the file untouched and comes back with a guided error. genoffice help lists the current command surface; the full reference is packages/cli/README.md.

What the agent actually runs

The Solar System deck in the demo took one prompt in Claude Code. Behind it, the agent followed the skill's staged workflow and the CLI checked every stage before the next one started:

genoffice capabilities --json                        # which cloud tools GenOffice has configured
genoffice guide slides design                        # the deck workflow and layout library
genoffice image "the eight planets in a row …" --aspect 16:9 --out deck/assets/cover.jpg
genoffice slides check deck/outline.json --json      # 8 pages, no findings
genoffice slides check deck/pages/01.json --json     # builds one slide, audits overflow and overlap
…                                                    # one page file per slide, fixed until each check is clean
genoffice create --type pptx --spec deck/pages --outline deck/outline.json --out deck/solar-system.pptx --json
genoffice slides render deck/solar-system.pptx --out deck/shots --json
genoffice slides audit deck/solar-system.pptx --json    # 8 slides, no layout issues
genoffice slides replace deck/solar-system.pptx --slide 4 --spec deck/pages/05.json --json
genoffice open deck/solar-system.pptx

No model call happens inside genoffice: the agent does the thinking, the CLI does the building and the checking, and the result opens in GenOffice or PowerPoint as an ordinary .pptx.

Download

All builds come from main; the macOS and Windows installers are signed. Older versions are on the Releases page.

The deb installs with apt — it pulls in the dependencies and adds GenOffice to the applications menu:

sudo apt install ./genoffice_<version>_amd64.deb

On Fedora / RHEL-family / openSUSE, install the rpm instead:

sudo dnf install ./genoffice-<version>.x86_64.rpm     # Fedora / RHEL family
sudo zypper install ./genoffice-<version>.x86_64.rpm  # openSUSE

The AppImage runs in place: install the FUSE 2 runtime (sudo apt install libfuse2; on Ubuntu 24.04 the package is libfuse2t64), make the file executable, then run it:

chmod +x GenOffice-<version>.AppImage
./GenOffice-<version>.AppImage

How it works

Seven Electron apps — Docs, Sheets, Slides, PDF, Markdown, HTML and the tabbed shell — share one engine layer of pure TypeScript packages plus a Rust sidecar for .xlsx. The original file is always the source of truth: edits are applied as narrow patches, and everything the editor did not touch survives the round trip untouched.

open docx ─► archive original by hash (never touched)
          ─► parse word/document.xml into a block tree, each block anchored to its original XML
          ─► Tiptap editor (manual + AI editing, dirty tracking)
save      ─► dirty blocks → OOXML fragments (referencing existing styles only)
          ─► splice into the original document.xml; untouched blocks keep their bytes
          ─► repack the zip; every other entry is copied byte-for-byte

The package-by-package tour (docx/pptx engines, pdf2docx, html2docx, the agent core and providers) lives in CONTRIBUTING.md.

Development

npm install
npm run fixtures     # generate test .docx fixtures
npm test             # engine + app unit tests (docs/sheets/slides need no display)
npm run typecheck    # tsc --noEmit across every workspace
npm run dev          # all six editors + shell against Vite dev servers
npm run dev:docs     # a single app (same pattern works per workspace)
npm run dist:mac     # package macOS dmg (regenerates third-party notices)
npm run dist:win     # package Windows nsis installer
npm run dist:linux   # package Linux AppImage + deb + rpm

The sheets app additionally needs a Rust toolchain for its xlsx sidecar (cargo on PATH); npm run build -w @genoffice/sheets compiles it automatically. See CONTRIBUTING.md for the checks every change must pass and how pull requests land.

Community

GenOffice is in active development and your feedback shapes it.

• Report a bug or request a feature in GitHub Issues.
• Join the GenOffice group chat on GenTeam to talk to the team and other users.
• Star the repo if GenOffice is useful to you — it is the best way to support the project.

FAQ

Yes. GenOffice is free and open-source under the Apache-2.0 license — no trial, no paid tier for the apps themselves.

Yes. GenOffice opens and saves native .docx, .xlsx and .pptx files. Saving is byte-preserving: parts of the file you didn't touch are written back byte-for-byte, so documents keep working in Microsoft Office.

Document editing is fully local — files never leave your machine to be opened, edited, saved or converted. The AI features (agents, search, image tools) need a network connection, with either a Genspark sign-in or your own model API key.

Yes — real PDF text and image editing that rewrites the page content stream with the original fonts preserved, not cover-up annotations.

Yes — entirely on-device: PDFium character-level extraction plus geometry-based layout analysis, no cloud service, no upload. Scanned pages are covered too: on macOS and Windows the system OCR reads them, so they convert to editable text rather than a page image.

Yes. Besides the keyless Genspark sign-in, GenOffice supports bring your own key for Claude, OpenAI, Gemini, DeepSeek, Kimi, GLM, Qwen, Doubao, MiniMax, Grok, Mistral, OpenRouter, Requesty and OpenCode Zen/Go, plus any OpenAI-compatible endpoint — including local model servers. Search, image generation and image/video analysis take their own keys under Settings → AI Media & Search.

Yes — Export as Word in the HTML app produces a native, editable .docx entirely on-device. The page is rendered in the built-in Chromium and reduced to real Word structures: headings, paragraphs, lists, tables, cards, KPI rows, form fields and page backgrounds; only visuals with no Word counterpart (charts, icons, decorated boxes) are embedded as pictures.

Yes. GenOffice installs a genoffice command line that runs the same engines headless: inspect, convert, create, read and edit documents from a terminal or a script, with --json output for programs. The bundled agent skill teaches Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf to use it; install it from Settings → Integrations. See Command line and agent skill.

Official packaged builds send limited usage analytics by default, and you can disable reporting at any time under Settings → General. Analytics never sends document content, file names, file paths, account identity or email addresses. See GenOffice Privacy for the complete event and data disclosures.

Security

See SECURITY.md for the process security posture (renderer sandboxing, IPC validation, external-link gating) and the threat models for AI-generated content.

Acknowledgements

GenOffice would not be possible without these open-source projects:

• Electron — the desktop runtime for every app.
• Univer (Apache-2.0) — the spreadsheet UI core that Sheets extends.
• PDFium (BSD-3-Clause, bundled via @embedpdf/pdfium) — the content-stream engine behind true PDF text and image editing.
• pdf.js (Apache-2.0) and pdf-lib (MIT) — PDF rendering and document assembly.
• Tiptap / ProseMirror — the block editors in Docs and Markdown.
• CodeMirror (MIT) — the source editor in HTML.
• Konva — canvas rendering for Slides and Sheets charts.
• HarfBuzz (wasm) — text-shaping metrics for complex scripts.
• calamine and IronCalc — the read and calc layers of the Rust xlsx sidecar.
• libeot (MPL-2.0) — the MicroType Express decoder for embedded PowerPoint fonts, ported to TypeScript.
• React (MIT) — the UI layer of every app.
• Mermaid (MIT) and KaTeX (MIT) — diagrams and math in Markdown and Docs.
• opentype.js (MIT) — font parsing for metrics and glyph lookup.
• JSZip (MIT) and fast-xml-parser (MIT) — the OOXML container and XML layers.
• Fluent UI System Icons (MIT) — the icon set across the ribbons.
• electron-updater (MIT) — in-app updates.
• Liberation, Carlito, Caladea, and Noto CJK fonts (OFL/Apache-2.0) — bundled document fonts.

npm run notices regenerates the bundled third-party license summary (tools/gen-third-party-notices.mjs); all runtime dependencies are MIT/Apache-2.0/BSD-3-Clause/OFL.

License

GenOffice is licensed under the Apache License 2.0, with one exception: the ee/ directory is reserved for future enterprise modules and is covered by the GenOffice Enterprise License.

The GenOffice and Genspark names and logos are trademarks of Mainfunc, Inc. The Apache-2.0 license does not grant permission to use them (see section 6); forks should use their own branding.