Can ComfyUI run without internet?

If you value privacy, have limited connectivity, or just want to be fully in control of your workflows, the answer matters. The short version: Yes. With the right setup, ComfyUI can run completely offline — but you’ll need to prepare properly. Let’s dive in.

How ComfyUI Offline Works ⚙️

ComfyUI is designed to run locally once installed. That means:

• Download the Promptus with ComfyUI app and toggle the offline button
• Grab your required models (Stable Diffusion v1.5, SDXL, LoRA, ControlNet, etc.) and place them in the correct folders.
• Disconnect your machine from the internet — ComfyUI will still generate images.

👉 If your cache is empty and you haven’t pre-downloaded models, ComfyUI will try to fetch them online and fail.

📦 What You Need Before Going Offline

To work smoothly without internet, you’ll want to:

• ⬇️ Download models in advance → v1-5-pruned-emaonly.safetensors, sd_xl_base_1.0.safetensors, LoRA packs, ControlNet weights.
• ⚡ Install optional speed-ups → like xformers.
• 📂 Organize your directories → keep models, embeddings, and custom nodes ready in local folders.
• 💾 Make space → expect to need tens of GBs depending on how many models you keep.

Once this is done, ComfyUI won’t ask for the internet at all.

✅ Benefits of Running Offline

• 🔒 Privacy → your prompts and generations never leave your machine.
• 📶 Independence → no reliance on servers or network outages.
• 🛠 Stable environment → no surprise auto-updates.
• 🖼 Creative freedom → total control over your workflow.

⚠️ Drawbacks to Consider

• ⏳ Manual updates → you’ll need to reconnect occasionally for bug fixes and new features.
• 📂 Library management → downloading and storing models yourself.
• 💾 Storage heavy → high-quality models eat disk space fast.

🔥 Bonus: ComfyUI via Promptus

If you do reconnect later, Promptus adds Google’s Nano Banana (Gemini 2.5 Flash Image) right next to ComfyUI. This combo gives you:

• ✨ Multi-image fusion
• 👤 Character consistency
• 🧹 Natural-language edits
• 🎨 Restoration & recoloring
• 🌍 Context awareness beyond SD

Offline, ComfyUI is your powerhouse. Online, you unlock Nano Banana’s reliability.

📊 Conclusion

Yes — Promptus with ComfyUI can run completely offline. Just prepare your models and dependencies first. For creators who value privacy and reliability, offline workflows give you peace of mind while keeping full creative control.