Last updated 08-10-2026
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Is This Image NSFW?
Is This Image NSFW? is a free web app that runs uploaded photos through the Stable Diffusion safety checker to flag explicit content. You drag in a PNG or JPG up to 50 MB and the site returns a safe-for-work verdict without creating an account. Developer Miguel Pascual built it as a public demo of his open-source cog-nsfw-filter project.
Most NSFW detectors are baked into image generators and only scan AI outputs. This tool repurposes Stable Diffusion's poorly documented checker for arbitrary uploads, which is useful when you need a quick second opinion on user-submitted images. There is no API dashboard or batch queue on the site itself, just a single-file upload flow in the browser.
The project suits moderators, indie app builders, and curious users who want a lightweight check before posting or sharing an image. It is entirely free with no pricing page, and the GitHub repo documents how to self-host the same filter through Cog. Tech stack on the live site includes Next.js and Tailwind CSS.
Accepts PNG or JPG uploads up to 50 MB through drag-and-drop or click-to-upload
Uses the Stable Diffusion safety checker adapted for non-AI images
Runs in the browser with no account or API key required
Open-source cog-nsfw-filter repo on GitHub for self-hosting the same filter
Built by developer Miguel Pascual with a link to the project source
Completely free with no signup required for one-off checks.
Open-source Cog package lets developers run the same filter on their own infrastructure.
Accepts standard PNG and JPG files up to 50 MB.
Uses a well-known Stable Diffusion safety model instead of a black-box API.
Homepage-only interface with no batch upload or REST API on the public site.
Relies on a single safety model that may miss edge cases other moderators catch.
No sub-pages or documentation beyond the GitHub readme linked from the site.
What does Is This Image NSFW? do?
Is This Image NSFW? scans an uploaded image through Stable Diffusion's safety checker and reports whether it is safe for work. Is This Image NSFW? works on arbitrary photos, not just AI-generated pictures, using code from the cog-nsfw-filter project.
Is Is This Image NSFW? free?
Yes. Is This Image NSFW? is a free web tool with no pricing page or paid tier on the site. Is This Image NSFW? lets anyone upload an image and get a result without creating an account.
What file types does Is This Image NSFW? accept?
Is This Image NSFW? accepts PNG and JPG files up to 50 MB according to the upload prompt on the homepage. Is This Image NSFW? supports drag-and-drop or click-to-upload from your device.
Who built Is This Image NSFW?
Is This Image NSFW? was built by Miguel Pascual, linked on the site as @m1guelpf. Is This Image NSFW? is based on his open-source cog-nsfw-filter repository on GitHub.
Can I self-host the NSFW filter?
Yes. Is This Image NSFW? points to the cog-nsfw-filter GitHub repo, which packages the Stable Diffusion content filter for Cog. Is This Image NSFW? is the public demo; developers can deploy the same filter from the repository.
Does Is This Image NSFW? work on AI-generated images only?
No. Is This Image NSFW? explicitly adapts the Stable Diffusion checker for arbitrary images, not just model outputs. Is This Image NSFW? homepage copy notes the original checker was poorly documented for general uploads before this modification.