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Stable Diffusion in its open source version remains your best choice for generating free images without limits, including through web interfaces like Hugging Face. Otherwise, Flux (also open source) has become really popular for quality, but you'll probably find free versions with usage limits on certain sites.
Are you really looking for something completely free without creating an account anywhere? Because honestly, fully open-source solutions like Stable Diffusion running locally still require some technical setup and decent machine specs. Free web interfaces (Hugging Face, Civitai) are simpler to use, but they usually come with daily generation limits or annoying queues. If you want something truly frictionless, tools like Leonardo or Copilot Designer give you a decent amount of free monthly credits - not as generous as they were two years ago, but still usable without spending anything.
If you really don't want the hassle of setting things up, the official demos on the devs' websites (like the one on Hugging Face for Flux or AUTOMATIC1111 for Stable Diffusion) let you generate without installing anything. What nobody really mentions is that you can also test different models directly in those interfaces - not just the default one - because some give better results for specific styles without costing more (zero, in other words). After that if you really want unlimited and no data sharing, yeah you gotta go with a local install, but honestly even an old machine can run a compressed version of these models without heavy specs.
After 2026 you should also check out Ideogram or Leonardo AI with their limited free versions, because the demos have gotten way better and you can really squeeze out decent content before you have to pay.
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