Casual Slides is a self-hostable, browser-based slides editor that looks and behaves like Microsoft PowerPoint — Office-style ribbon (Home · Insert · Design · Transitions · Animations · Slide Show · View · Review), slide-panel thumbnails, layouts, themes, file-centric workflow. Upload a .pptx, edit it like the web, save it back. Deep OOXML PresentationML round-trip — 68 of 87 fidelity probes ✅ after wave 7o.

Compares to: Google Slides · Microsoft PowerPoint Online · PPTist · OnlyOffice Presentation Editor.

Built on Univer OSS (Apache-2.0) — the OSS variant, never the Pro package — with a fork-and-patch layer for the gaps Univer hasn't filled (collab rev tracking, element mutations as CommandType.MUTATION, new IPageElement variants for tables/charts/video). Sister projects: Casual Sheets (.xlsx, v0.2.1) and Casual Editor (.docx).

🎉 Status: v0.1.0 (2026-06-01) — first tagged release. Single-user editor works end-to-end with .pptx round-trip; Office ribbon, layouts, themes, backgrounds, format pane, presenter view, find-and-replace, slideshow, PDF + PNG export, recent files, autosave, error boundary, Docker self-host all live. Co-edit is gated behind VITE_COLLAB_ENABLED (default off) — the existing raw-WebSocket broadcast remains a single-active-editor spike; the Yjs + Hocuspocus migration (Casual Sheets has it) is the v0.2.0 target. See CHANGELOG.md.

• Office-style ribbon — Home · Insert · Design · Transitions · Animations · Slide Show · View · Review
• Slide-panel thumbnails on the left rail · reorder · duplicate · hide · context menu (right-click → duplicate / hide / delete / new)
• 6 layout templates picked from the toolbar Layout dropdown (title slide · title + content · two content · comparison · blank · section header)
• Theme picker + background picker (solid + gradient fills)
• Slide Show mode (F5) with keyboard navigation
• Notes panel for speaker notes
• Recent files dialog backed by IndexedDB
• Properties dialog · About dialog · Help → Report a Bug (GitHub issue prefill)
• PowerPoint-shaped data model — pages, masters, layouts, notes pages, theme color scheme, theme fonts

• Parsing + serialisation runs entirely in Web Workers — multi-MB decks don't block the main thread
• 2 493 LOC pptx-import.ts covering deep OOXML PresentationML: slides, layouts, masters, themes, theme color resolution, placeholder inheritance, gradient fills, text outline + arrowheads + effects, hyperlinks via custom ranges, tables + charts as IPageElement, picture backgrounds, hidden slides, text wrap, autofit, body rotation, image cropping, connectors, RTL, strikethrough/baseline, bullets + indent + line spacing, multi-run rich text + paragraph alignment, color modifiers + rotation + flips
• Export via PptxGenJS (MIT)
• Round-trip strategy: map OOXML → Univer's ISlideData; passthrough unmapped XML (notesSlides, comments, diagrams, ink, raw layout/master/theme) via ISlideData.resources["CASUAL_SLIDES_PPTX_RAW"]
• 68 / 87 fidelity probes ✅ in docs/FIDELITY_TRACKER.md. Wave 7o snapshot.
• Full pipeline spec: docs/PPTX_PIPELINE.md

Today's collab is the v0.0.x "good enough for one editor at a time" spike:

• 104-line raw ws + node:http server in apps/server/
• 173-line bridge that broadcasts mutations via JSON envelopes; sufficient for single-active-editor sessions
• Anonymous rooms by URL · presence callbacks · echo-loop guard via fromCollab flag

Yjs + Hocuspocus migration is the v0.1.0 blocker. Same shape Casual Sheets uses (apps/server/src/index.ts — Fastify + Hocuspocus + rate limit + room cap + replay retry + dead-letter). The migration is mechanical port work; what's holding it is fidelity-first investment.

See docs/ARCHITECTURE.md for the system diagram and target Y.Doc shape.

One image, one port. The repo's root Dockerfile is a multi-stage build (deps → build-web → runtime) that produces a single node:22-alpine image. The runtime serves the built Vite bundle from apps/web/dist and the /collab WebSocket relay on the same port — no nginx, no reverse-proxy WS plumbing.

docker build -t casualoffice/casual-slides:latest .
docker run -p 3000:3000 casualoffice/casual-slides:latest
# open http://localhost:3000
# verify: curl http://localhost:3000/health → {"ok":true,"rooms":N,"ts":…}

Or via the included docker-compose.yml:

docker compose up -d

Heads up — single-node, in-memory rooms. Restarting the container drains every active room. The Yjs + persistence migration lands with v0.1.0 (see Roadmap below); until then, treat the image as a session-only relay.

Build args worth knowing about:

The docker-publish.yml workflow (triggered on v* tags) builds multi-arch (linux/amd64, linux/arm64), signs with SLSA provenance + SBOM, and pushes the rolling tag set (:0.1.0, :0.1, :0, :latest) to Docker Hub.

Roadmap (P6, post-v0.1): lift sheet's full self-host platform — host.Integration interface (memory / local / S3 / postgres), WOPI endpoints, JWT auth, admin panel at /admin, 9 webhook events with HMAC-SHA256 signing. Today's image is single-node, in-memory rooms.

Univer's slides packages are real but have gaps the upstream hasn't filled yet. We track them in docs/UNIVER_SLIDES_GAPS.md (10 gaps). For each gap:

1. Land the change in the fork at CasualOffice/univer-revamp on a slide/<tag> branch.
2. Open the upstream PR to dream-num/univer.
3. Mirror the same diff as a pnpm patch artifact under patches/ so production builds get the fix without waiting for an upstream release.

The first patch is already live:

Prerequisites: Node ≥ 18.17, pnpm 10+.

pnpm install               # install workspace dependencies + apply patches
pnpm dev:web               # Vite  →  http://127.0.0.1:5373
pnpm typecheck             # tsc across all packages
pnpm build:web             # production bundle

The dev server boots the Spike A bootstrap — a 3-page deck rendered via @univerjs/slides + @univerjs/slides-ui with native chrome hidden. Open the devtools console and run __slideRevProbe() to confirm the rev-tracking patch is live (prints before=1 after=2).

.
├── apps/
│   └── web/                     # Vite + React frontend
│       └── src/
│           ├── App.tsx           # spike banner + UniverSlide
│           ├── UniverSlide.tsx   # Univer Slides mount
│           ├── default-slide.ts  # inline default deck (until pptx import lands)
│           ├── main.tsx
│           └── styles.css
├── docs/
│   ├── ARCHITECTURE.md          # system design
│   ├── RESEARCH.md              # Univer Slides 0.24 technical brief
│   ├── UNIVER_SLIDES_GAPS.md    # 10 gaps + fork-patch plan
│   └── PPTX_PIPELINE.md         # pptx I/O pipeline
├── patches/
│   ├── README.md                # pnpm patch authoring workflow
│   └── @univerjs__slides@0.24.0.patch   # Gap 1 rev tracking
├── PLAN.md                       # phased plan (P0–P6)
└── CLAUDE.md                     # project guardrails for AI-assisted development

The Univer fork lives in a separate repo: CasualOffice/univer-revamp. We consume @univerjs/* from npm at v0.24.0 and apply patches; the fork is for upstream PR authorship.

• No 100% PowerPoint feature parity — "clearly familiar to Office users" is the bar, not pixel-perfect.
• No persistence / accounts in v0.0.x — anonymous sessions by room URL. JWT lands in v0.1.
• No AI / LLM features — the Univer command bus is extensible; wire your own model in later.
• No mobile in v0.0.x — desktop browsers only. Mobile viewer back-ports in v0.1, same approach as sheet.
• No Univer Pro — everything is built on OSS. Missing features are built here or deferred.

Apache-2.0. See LICENSE.

The Univer fork at CasualOffice/univer-revamp retains its upstream Apache-2.0 license. The pnpm patch artifacts under patches/ are derived from that fork and are also Apache-2.0.