Open-source, browser-native image editor with integrated AI
No install · No upload · Fully private · AI when you want it
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Quick Start | Docs | Plugins | Changelog
👆 Try it live at gpex.cloud — Drag an image → edit with layers, masks & AI tools → export. All in the browser.
Note
Beta — Core editing is stable and developer-tested. Some advanced features are being polished. Issues and PRs are welcome!
Professional image editing that runs entirely in your browser — with optional, private AI superpowers.
OpenGPEX gives you full creative control: use traditional manual tools for precision, or accelerate with AI when you choose. Your images never leave your device unless you explicitly opt in to cloud sync.
| Feature | Description |
|---|---|
| 🖼️ 10+ Formats | Open anything: PNG · JPEG · WebP · AVIF · TIFF (16-bit) · SVG · EPS · RAW (CR2/NEF/ARW/DNG) · HEIC · GIF (animated) · BMP |
| 🤖 AI When You Want It | Background removal, AI segmentation (SAM 2.1), super-resolution upscale, ComfyUI & LLM integration — all optional, all private, all client-side. |
| 🛡️ Non-Destructive | Your original image is never modified. Edits are pure metadata — always reversible, always lossless. |
| ⚡ Smooth & Responsive | Pan, zoom, and brush at 60 FPS. Handles 100MP+ images without slowing down or running out of memory. |
| 🕰️ Smart Undo | Unlimited undo/redo that never jumps your viewport — you stay exactly where you were working. |
| ☁️ Cloud Sync | Optional GPEX Cloud — save, load, and share across devices. Works fully offline too. |
| 🧩 Extensible | Everything is a plugin. Install community extensions at runtime, or build your own. |
| 🔒 Private by Design | Your images never leave your device. AI runs locally in your browser — zero server-side processing. |
No setup required — Open gpex.cloud in your browser and start editing immediately.
Cloud version includes auto-save, cross-device sync, and always up-to-date features.
- Layers — Multi-layer compositing with 16 blend modes, opacity, fill, lock, visibility
- Brush & Eraser — Catmull-Rom spline smoothing, adjustable size/opacity/hardness, stamp-based rendering
- Non-destructive Eraser — Eraser paints a mask (not pixels); Tab to Restore hidden content anytime
- Text — Inline contenteditable DOM editing with full IME (CJK) support, 60+ fonts, Google Fonts search, local font access
- Transform — Move, scale (proportional/free), 8-direction handles
- Basic — Brightness, Contrast, Saturation, Hue Rotate, Blur
- Curves — RGB + per-channel cubic spline tonal control
- Levels — Histogram-based with Auto-levels
- Channel Mixer — 3×3 matrix with 7 presets (B&W, Sepia, Cross Process, etc.)
- Color Balance — Shadows/Midtones/Highlights color shifts with preserve-luminosity
- 5 tools: Rectangle, Ellipse, Lasso, Magic Wand, SAM (AI segmentation)
- Operations: Peel (cut to layer), Stamp (copy to layer), Invert, Select from Alpha, Offset (expand/contract)
- Feathering with soft graduated edges
- Background Removal — RMBG 1.4 / InSPyReNet Ultra
- AI Segmentation — SAM 2.1 (point prompt + auto-segment)
- Super Resolution — 2× / 4× upscale with AI detail enhancement
- ComfyUI Bridge — Connect to local/remote ComfyUI for inpainting, style transfer, ControlNet, custom workflows
- LLM Image Bridge — OpenAI-compatible API for text-to-image generation, editing, and variations
- Creation/Branch model — Trunk/Branch hierarchy for organizing AI multi-results and derived images
- TabDock — Floating dock with thumbnails, branch badges, and configurable layout
- Animated Images — Multi-frame GIF/APNG import, playback, and re-export
- JPEG, PNG, WebP, AVIF, TIFF (8/16/32-bit), GIF (animated), BMP
- Configurable quality, DPI, dimensions, ICC profile embedding
- EXIF/metadata preservation
git clone https://github.com/gpex-cloud/opengpex.git && cd opengpex && pnpm install && pnpm devOpen http://localhost:3030 — drag an image in to start editing.
Or skip setup entirely: gpex.cloud (online version).
Production build
pnpm build && pnpm startEverything in OpenGPEX is a plugin — tools, panels, overlays, and effects.
plugins/
├── base/ # Official plugins (shipped with core)
├── community/ # Community-contributed
└── user/ # Your local dev sandbox
Each plugin is a self-contained module with:
commands— Dispatchable actions with optional keyboard shortcutssignals— Reactive state for cross-plugin communicationcomponent— React UI rendered into named slotsinteractions— Gesture handlers with priority-based routingcontributions— Declarative slot/menu contributions
Install plugins at runtime via ZIP upload through the Plugin Hub. Build your own with the Plugin Development Guide.
| Layer | Technology |
|---|---|
| Framework | Next.js 16 · React 19 |
| State | Immer + custom store with dual-track (fast/slow) and volatile refs |
| Styling | Tailwind CSS v4 |
| Rendering | OffscreenCanvas + Web Workers + tiled engine + isomorphic painter |
| AI/ML | ONNX Runtime WebAssembly (client-side inference) |
| Formats | wasm-vips · LibRaw-Wasm · resvg-js · gifenc |
| Animation | Framer Motion · GSAP |
| Cloud | Cloudflare R2 + D1 + Workers (optional) |
Contributions are welcome! See CONTRIBUTING.md for details.
# Fork → Clone → Branch → Code → Lint → PR
pnpm lint # Run before committingAI features download pre-trained models on-demand from HuggingFace (not bundled). Users choose when to download — no forced network usage:
| Model | Purpose | Source | License |
|---|---|---|---|
| RMBG 1.4 | Background removal | briaai/RMBG-1.4 | BRIA RMBG-1.4 (non-commercial) |
| InSPyReNet Ultra | Background removal (high-quality edges) | OS-Software/InSPyReNet-SwinB-Plus-Ultra-ONNX | MIT |
| SAM 2.1 | AI segmentation (Segment Anything) | anthropics/sam2.1-hiera-tiny | Apache-2.0 |
| Upscale models | Super-resolution (2×/4×) | Various (ESRGAN-based) | Model-specific |
The following pre-compiled WASM/JS libraries are bundled in public/ext/ for client-side format processing:
Note
Next.js is configured with Cross-Origin Isolation headers (COOP/COEP) to enable SharedArrayBuffer, allowing multi-threaded WASM processing (e.g. for wasm-vips).
| Library | Purpose | Source | License |
|---|---|---|---|
| LibRaw-Wasm | RAW image decoding (CR2/NEF/ARW) | ybouane/LibRaw-Wasm | ISC |
| resvg-js | SVG rendering & rasterization | thx/resvg-js | MPL-2.0 |
| ghostpdl-wasm | PostScript/PDF processing | okathira-dev/ghostpdl-wasm | AGPL-3.0 |
| heic-to | HEIC/HEIF format conversion | hoppergee/heic-to | GPL-3.0 |
| wasm-vips | TIFF/AVIF encoding & decoding, CMYK conversion | kleisauke/wasm-vips | MIT / LGPL-3.0 |
| gifenc | GIF multi-frame encoding | mattdesl/gifenc | MIT |
GPL-3.0-only — see LICENSE.
Third-party plugins loaded dynamically at runtime are independent works and may use any license. Plugins in the source tree are covered by GPL-3.0.
If OpenGPEX helps you, consider giving it a ⭐ — it keeps the project going!