AI Generative Fill 2026: Extend Any Photo With Open Source Tools, Free and Locally
Photoshop's generative fill costs $10/month and sends your photos to Adobe's cloud. The open source alternative runs locally and free - but the setup is fragmented. Here is the 2026 state of the art.
💡 What You Will Learn
Photoshop's generative fill costs $10/month and sends your photos to Adobe's cloud. The open source alternative runs locally and free - but the setup is fragmented. Here is the 2026 state of the art.
📜 Table of Contents
The 2026 Generative Fill Stack
Generative fill - selecting a region and having AI extend or reconstruct it - became table stakes in 2026. The closed options (Photoshop's Firefly, Google's Magic Eraser) are polished but cloud-bound and subscription-priced. The open source path exists and is genuinely good; it is just assembled from parts (stars fetched 2026-08-12).
The Two Jobs of Generative Fill
1. Outpainting (extend the canvas) - the photo continues beyond its edge: sky, ground, room. Tools: Stable Diffusion inpainting models with an outpaint workflow, or dedicated outpainting UIs.
2. Inpainting (fix inside the photo) - remove an object, repair a scratch, rebuild a missing corner. Tools: Stable Diffusion inpainting models, and specialized editors built on them.
The Open Source Stack
- Stable Diffusion WebUI (164,477 stars) - the classic. Mask a region, pick an inpainting model (SD 1.5 inpainting or SDXL inpainting), generate. Solid, well-documented, works on 8 GB GPUs.
- ComfyUI (126,770 stars) - the modular choice. Outpainting is a node graph: load model, load image, outpaint node, denoise. More setup, more control, and the best option for batch work.
- Diffusers (huggingface/diffusers) - the code-native path for pipelines in your own apps.
- CLIP-based masking helpers - automatic mask generation for 'remove the person' style tasks.
A 15-Minute Outpainting Recipe (ComfyUI)
- Install ComfyUI, download an SDXL inpainting model (~7 GB).
- Load the image, add an Outpaint node: set the expansion direction and pixels (256 is a safe start).
- Connect a denoise step; prompt for what the extended area should plausibly contain ('continued sky, same lighting').
- Generate; if the seam is visible, run a second pass with lower denoise over the border region only.
The Quality Reality
Open source fill quality is close to commercial on clean subjects (landscapes, architecture, textures) and visibly weaker on complex ones (people, hands, logos). The commercial edge comes from proprietary models and prompt tuning, not magic. For most product photos and personal shots, local fill is indistinguishable - and your image never leaves your machine.
FAQ
Is open source generative fill really free? Yes - the models are open weights; you pay only electricity. A 4 GB+ GPU is the practical requirement.
How does it compare to Photoshop's fill? Close on landscapes and textures; behind on people and brand logos. No subscription, full privacy.
Can I use it on a Mac? Yes - via Diffusers with MPS (Apple Silicon) or cloud GPUs; expect slower generation on CPU-only machines.
Related reads: AI Image Editor 2026, ComfyUI Workflows Civitai 2026, Stable Diffusion Workflow Install 2026.
