What Is the Best Free Offline AI Image Editor in 2026? Krita + Local AI Setup
The best free offline AI image editor in 2026 is Krita combined with GMIC and optional ComfyUI extensions. This open-source stack offers powerful features such as AI inpainting, upscaling, face restoration, background removal, and even Stable Diffusion-based image generation, all without needing an internet connection or subscription. It supports unlimited usage, works on Windows, Linux, and macOS, and gives users full privacy and creative control, making it ideal for artists, designers, and privacy-conscious users.
Quick answer: For most people the best free offline AI image editor in 2026 is Krita with the open-source Krita AI Diffusion plugin running a local ComfyUI server. It gives you generative fill, object removal, outpainting, upscaling and text-to-image on your own PC, with no subscription and no uploads. It needs a reasonably modern GPU and plenty of disk space. Add Upscayl and rembg for quick upscaling and background removal.
Key takeaways
- Combine Krita with the Krita AI Diffusion plugin and a local ComfyUI server for generative fill, object removal and outpainting offline.
- You need the internet once to download the app and model files, after which images never leave your own machine.
- A reasonably modern GPU and plenty of disk space are the real requirements, so check VRAM before you start downloading models.
Most "free AI photo editors" quietly upload your images to a server and cap how many edits you get. If you want AI editing that runs entirely on your own computer, this guide shows what works, what hardware you need and how to set it up.
What does "offline AI image editor" actually mean?
An offline AI image editor runs the AI model on your own CPU or GPU, so your images never leave the machine. You need the internet once, to download the app and the model files. After that you can unplug the network cable and keep working.
This matters for three practical reasons:
- Privacy: client photos, ID scans, product shots under NDA and family pictures stay on your disk.
- No limits: there are no credits, watermarks or monthly caps. The only limit is your hardware.
- Control: you choose the model, the settings and the output size.
A simple test tells you whether a tool is really offline: disconnect from the network, restart the app and run the AI feature. If it fails or asks you to sign in, it depends on the cloud.
The best free offline pick: Krita + Krita AI Diffusion
Krita is a free, open-source painting and image editing program for Windows, Linux and macOS. On its own it is a strong layer-based editor. The AI part comes from Krita AI Diffusion, a GPL-3.0 plugin that adds generative AI tools inside the Krita canvas and uses ComfyUI as its engine. The plugin can install and manage a local ComfyUI server for you, so you don't have to build the workflow by hand.
What you can do with it, all locally:
| Feature | What it does in practice |
|---|---|
| Generative fill (inpainting) | Select an area and remove an object, replace it, or add something new that matches the lighting. |
| Expand (outpainting) | Extend a photo beyond its borders, for example turning a portrait crop into a wide banner. |
| Text-to-image | Generate an image from a prompt using Stable Diffusion family models or other supported models. |
| Upscaling | Enlarge images to high resolutions while adding detail. |
| ControlNet | Guide generation with a scribble, line art, depth map or pose so the result follows your layout. |
| Reference images (IP-Adapter) | Borrow the style or composition of a reference image. |
| Live painting | The AI reinterprets your canvas as you draw, useful for concept sketches. |
The plugin also offers a paid cloud option for people without a capable GPU. If privacy is your reason for going offline, choose the local server during setup.
Other free offline AI tools worth adding
Krita covers creative editing and generation. These smaller tools handle single jobs faster:
| Tool | Best for | Licence | Notes |
|---|---|---|---|
| Upscayl | One-click upscaling of photos and artwork | AGPL-3.0 | Desktop app for Windows, macOS and Linux. Needs a Vulkan-compatible GPU; many integrated GPUs won't work. |
| rembg | Automatic background removal | MIT | Command-line and Python tool. Downloads its model on first use, then works offline. |
| ComfyUI (standalone) | Custom generation workflows | GPL-3.0 | Node-based and very flexible, but steeper to learn than the Krita plugin. |
| GIMP 3 + G'MIC | Classic photo retouching with hundreds of filters | GPL | Mostly traditional filters rather than generative AI. G'MIC also runs as a plugin inside Krita. |
A quick background removal with rembg looks like this:
pip install "rembg[cpu, cli]"
rembg i product.jpg product-cutout.pngUse "rembg[gpu, cli]" instead if you have a supported NVIDIA GPU.
What hardware do you need?
A dedicated GPU is the deciding factor. Krita itself runs on modest machines, but generative models are heavy. The plugin's documentation gives these guidelines:
| Component | Workable | Comfortable |
|---|---|---|
| GPU | NVIDIA RTX 2060 class with about 6 GB VRAM, Apple Silicon (M1 or later), Intel Arc with 8 GB+, or an AMD card with ROCm support | NVIDIA RTX card with 12 GB or more VRAM |
| RAM | 16 GB | 32 GB |
| Disk space | 10 GB minimum for models | 50 GB+ on an SSD if you add several models |
| OS | Windows, Linux or macOS (64-bit) | |
CPU-only generation is supported but very slow, often minutes per image. If you only have integrated graphics, start with rembg and simple Krita filters, and treat generation as optional.
How do you set it up?
Allow 30 to 60 minutes, most of it spent downloading models.
- Install Krita from krita.org. The plugin needs Krita 5.2 or newer, and it has separate builds for Krita 5 and Krita 6, so match the plugin version to your Krita version.
- Download the plugin ZIP from the Krita AI Diffusion releases page on GitHub. Don't use the "Code" download button; take the release file.
- Import it: in Krita go to Tools > Scripts > Import Python Plugin from File, choose the ZIP and restart Krita.
- Open the docker: Settings > Dockers > AI Image Generation.
- Configure the server: choose the local managed server, pick your GPU backend (CUDA, ROCm, Apple MPS, Intel XPU or CPU) and select the model packages you want. The plugin installs ComfyUI and downloads the models.
- Test offline: once it works, disconnect from the internet, restart Krita and run a small inpainting job to confirm nothing depends on the cloud.
A practical workflow example
Say you need a clean product photo for an online listing:
- Open the photo in Krita and select a stray cable in the background.
- Use generative fill with an empty prompt to remove it.
- Expand the canvas to a 16:9 banner and outpaint the sides.
- Export, then run rembg for a transparent cut-out version.
- Upscale the final image with the plugin's upscaler or Upscayl.
Every step runs on your machine, so the client's unreleased product never touches a third-party server.
Offline vs online AI editors: which should you use?
| Factor | Krita + local AI | Online editors (Photoshop, Canva, Fotor) |
|---|---|---|
| Cost | Free software; you pay for hardware and electricity | Free tiers with limits; paid plans for full AI features |
| Privacy | Images stay on your disk | Images are processed on the provider's servers |
| Setup effort | Moderate: install, models, GPU drivers | Very low: open a browser |
| Hardware needs | Dedicated GPU strongly recommended | Works on almost any device |
| Ease for beginners | Learning curve | Easier, more guided |
| Model choice | You pick and switch models | Fixed by the provider |
Choose the offline route if you handle sensitive images, edit in volume, or already own a decent GPU. Choose an online editor if you have a low-end laptop, need a quick result once in a while, or work mostly on a phone.
Common mistakes and how to fix them
- "Out of memory" errors: lower the resolution, choose a lighter model, or close games and browsers that use VRAM.
- Very slow generation: check that the server is using your GPU backend, not CPU. Update your GPU driver.
- Disk fills up: models are large. Keep only the ones you use and store them on an SSD with free space.
- Plugin won't load: you probably downloaded the source code instead of the release ZIP, or used a plugin build for the wrong Krita major version.
- Assuming every model is free for commercial work: the software is open source, but each AI model has its own licence. Some popular checkpoints are non-commercial. Read the model's licence before using its output for paid client work.
Is it safe to download AI models?
Yes, if you stick to trusted sources. Let the plugin download its default models, and prefer the .safetensors format, which stores weights only and cannot run code the way older pickle-based files can. Avoid "cracked" installers and random model packs from file-sharing sites; they are a common way to spread malware. Generative tools can also be misused for fake images, so use them responsibly and don't edit real people's photos in misleading ways. Our piece on the main ethical concerns in generative AI covers this in more detail.
Where to go next
Start small: install Krita and the plugin, download one general-purpose model, and practise inpainting on a few of your own photos before adding ControlNet or extra models. If you want to compare these with cloud-based options, see our list of generative AI tools and our comparison of free AI tools beyond ChatGPT.
Related reading
Frequently Asked Questions
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Vaishnavi is a skilled tech professional at the Ethical Hacking Training Institute in Pune, responsible for managing and optimizing the technical infrastructure that supports advanced cybersecurity education. With deep expertise in network security, backend operations, and system performance, she ensures that practical labs, online modules, and assessments run smoothly and securely. Her behind-the-scenes contributions play a vital role in delivering a seamless and secure learning experience for aspiring ethical hackers.
