GenOffice fork that works with any local LLM instead of a cloud account

A developer has released a fork of GenOffice, the free open-source AI office suite, that removes the cloud-account requirement and instead connects to any OpenAI-compatible endpoint, including local servers like Ollama, LM Studio, vLLM, llama.cpp server, and text-generation-webui, or hosted APIs like OpenRouter. The fork, based on genspark-ai/genoffice under Apache-2.0, modifies only the AI provider defaults and settings UI, leaving all other upstream features unchanged. GenOffice supports real Microsoft Office formats (.docx, .xlsx, .pptx), PDF, and Markdown, with AI editing as a first-class workflow, and is available for macOS, Windows, and Linux.

A free, open-source AI Office suite — this fork drops the cloud-account requirement and talks to any OpenAI-compatible endpoint instead: a local server Ollama, LM Studio, vLLM, llama.cpp server, text-generation-webui or a hosted API OpenRouter, or any other OpenAI-compatible provider . Forked from genspark-ai/genoffice Apache-2.0 . Changed per Apache-2.0 §4 b : the AI provider defaults packages/ai-provider/src/providers.ts and settings UI apps/shell/src/renderer/src/SettingsModal.tsx — see git history for the full diff. Everything else is upstream GenOffice, unmodified. Demo https://www.youtube.com/watch?v=B2pLdMX95v4 — upstream's video; the editor features it shows are unchanged in this fork, only the AI provider setup differs. GenOffice is a free, open-source alternative to Microsoft Office for macOS, Windows, and Linux, built around AI editing as a first-class workflow rather than a bolted-on chat box. It opens and saves the real Microsoft Office formats — Word .docx , Excel .xlsx , PowerPoint .pptx — and edits PDF and Markdown too: a word processor, spreadsheet, presentation editor, PDF editor, and Markdown editor as six Electron apps sharing one engine layer. Watch the demo video on YouTube https://www.youtube.com/watch?v=B2pLdMX95v4 Real PDF editing — retype text and edit images in the page itself, original fonts preserved. Microsoft Word–compatible, byte-preserving — only what you touched changes; Word never notices. .docx editing Word-faithful pagination — page breaks land where Word puts them. Excel-compatible spreadsheets — in-house engine with a Rust .xlsx sidecar, own charts, pivot tables, slicers. PowerPoint-compatible presentations — in-house .pptx engine with masters, layouts, smart guides, non-destructive crop. Markdown to Word, fully local — the same OOXML engine, no Pandoc, no cloud. AI that edits documents — block-level edits with snapshots and diffs, document-aware agents. Agent tools built in — web/image search, image generation, media analysis. Light / dark / system themes. macOS, Windows, Linux. Free & open-source Apache-2.0 . This fork does not publish prebuilt installers — build from source see Development development below: npm install , then npm run dist:mac / dist:win / dist:linux . Upstream's own prebuilt installers, linked from genspark-ai/genoffice https://github.com/genspark-ai/genoffice , default to the Genspark cloud provider — they are not this fork. | App | Product | What it is | |---|---|---| apps/docs | GenOffice Docs | .docx word processor. Byte-preserving round trip: only dirty paragraphs are regenerated paragraph patch , everything else in the original file is kept byte-for-byte, so opening and saving never breaks layout in Word. Paginated view whose line metrics reproduce the original document's layout, tracked changes, comments, styles, equations, ink. | apps/sheets | GenOffice Sheets | .xlsx spreadsheet. UI built on the open-source .xlsx import/export runs through an in-house Rust sidecar calamine + IronCalc , charts are rendered in-house Konva , plus pivot tables, slicers, conditional formatting, and formula tracing. | apps/slides | GenOffice Slides | .pptx presentations. In-house .pptx parse/render/edit engine with masters, charts, cropping, ink, and text shaping HarfBuzz metrics . | apps/pdf | GenOffice PDF | .pdf viewer/editor on | apps/markdown | GenOffice Markdown | .md / .markdown editor: Tiptap block editor over plain Markdown files — headings, lists, tables, images, code blocks — saved back as plain Markdown, hosted in shell tabs. | apps/shell | GenOffice | The suite shell: home screen, tabbed hosting of the five editors, light/dark/system theme, auto-update. | Every app embeds the same AI panel: block-granular AI editing with version snapshots and diffs in docs, a tool-calling agent over workbook/slide/PDF state in the others. The whole suite ships light / dark / system UI themes built on shared design tokens packages/ui , with a CI guard that keeps chrome colors on the token system. Document surfaces stay light in dark mode — Word-style dark chrome around white paper — so files render and export identically in both themes. AI backend. On a fresh install this fork defaults to the Local / Custom OpenAI-compatible provider with the base URL, model, and key all blank — nothing is pre-configured, no account or cloud sign-in required. Point it at any server that speaks the OpenAI chat/completions wire protocol: | Server | Base URL | Model | API key | |---|---|---|---| | http://localhost:11434/v1 llama3.1 LM Studio https://lmstudio.ai/ http://localhost:1234/v1 OpenRouter https://openrouter.ai/ https://openrouter.ai/api/v1 openai/gpt-4o-mini Settings → AI Provider → Local / Custom OpenAI-compatible , fill in the three fields, then Test connection. Upstream's other providers are still selectable in the same screen and work as upstream describes: Genspark signs in via a device-code flow no key needed and also unlocks the Genspark "gsk" tool endpoints the agents build on — web/image search, image generation and editing, media analysis, audio transcription packages/ai-search ; Claude / Gemini / DeepSeek / OpenAI need that vendor's own API key. All pure TypeScript, no Electron dependency, unit-tested except the UI kit : packages/docx-engine — docx parsing → block tree with docxIndex anchors and passthrough , OOXML fragment generation, byte-level paragraph patching. packages/pptx-engine / packages/pptx-render — pptx model and rendering. packages/file-parse — text extraction for AI attachments office formats, text formats . packages/agent-core — the AI agent loop and skill composition shared by every app. packages/ai-provider — provider abstraction and streaming for the model backends. packages/ai-search — Genspark auth + web/image search tools. packages/i18n , packages/ui , packages/project-store , packages/electron-utils — shared i18n core, React UI kit, recent-files store, and Electron main-process helpers. 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 five 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. Local UI/e2e driver scripts Playwright + Electron, for local acceptance, not committed by default live in scripts/drivers/ /douglas168/open-genoffice/blob/main/scripts/drivers/README.md . open docx ─► archive original by hash never touched ─► docx-engine parses word/document.xml top-level elements w:p / w:tbl / … ─► Block tree, each block anchored by docxIndex + original XML slice ─► Tiptap streaming editor manual + AI editing, dirty tracking save ─► dirty blocks → OOXML fragments referencing existing styles only ─► splice into original document.xml untouched blocks keep original bytes ─► repack zip; all other entries copied byte-for-byte The same philosophy holds in sheets and slides: the original file is the source of truth, edits are applied as narrow patches, and everything the editor didn't touch survives the round trip untouched. Is GenOffice free? Yes. GenOffice is free and open-source under the Apache-2.0 license — no trial, no paid tier for the apps themselves. Can GenOffice open Microsoft Word, Excel, and PowerPoint files? 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. Does GenOffice work offline? Document editing is fully local — files never leave your machine to be opened, edited, or saved. The AI features need a network connection to whatever endpoint you configure in Settings → AI Provider — a LAN-only local server e.g. Ollama keeps that traffic off the public internet too; a cloud provider Genspark, OpenRouter, a named vendor does not. Can GenOffice edit PDF files? Yes — real PDF text and image editing that rewrites the page content stream with the original fonts preserved, not cover-up annotations. See SECURITY.md /douglas168/open-genoffice/blob/main/SECURITY.md for the process security posture renderer sandboxing, IPC validation, external-link gating and the threat models for AI-generated content. GenOffice would not be possible without these open-source projects: Electron https://www.electronjs.org/ — the desktop runtime for every app. Univer https://github.com/dream-num/univer Apache-2.0 — the spreadsheet UI core that Sheets extends. PDFium https://pdfium.googlesource.com/pdfium/ BSD-3-Clause, bundled via @embedpdf/pdfium https://github.com/embedpdf/embed-pdf-viewer — the content-stream engine behind true PDF text and image editing. pdf.js https://github.com/mozilla/pdf.js Apache-2.0 and pdf-lib https://github.com/Hopding/pdf-lib MIT — PDF rendering and document assembly. Tiptap https://tiptap.dev/ / ProseMirror https://prosemirror.net/ — the block editors in Docs and Markdown. Konva https://konvajs.org/ — canvas rendering for Slides and Sheets charts. HarfBuzz https://github.com/harfbuzz/harfbuzz wasm — text-shaping metrics for complex scripts. calamine https://github.com/tafia/calamine and IronCalc https://github.com/ironcalc/IronCalc — the read and calc layers of the Rust xlsx sidecar.- 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, and the bundled fonts Liberation, Carlito, Caladea, Noto CJK subsets are OFL/Apache. GenOffice is licensed under the Apache License 2.0 /douglas168/open-genoffice/blob/main/LICENSE , with one exception: the ee/ directory is reserved for future enterprise modules and is covered by the GenOffice Enterprise License /douglas168/open-genoffice/blob/main/ee/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.