10 Best NSFW Detectors to Check Images for Adult Content

We can't always tell whether an image contains adult content at a glance, especially when dealing with large numbers of uploads. One way to check is by using an NSFW detector, a tool that scans an image and estimates whether it contains nudity, sexual content, or other adult material. Most return a score or a label such as safe, suggestive, or explicit.

Some detectors are free and run in your browser. Others are APIs made for apps that handle thousands of uploads a day, or Python libraries that you can add to your own applications. Whatever you need, our list covers 10 of the best NSFW detection tools, including pricing, what each one does well, and where it still lacks.

How We Choose the Best NSFW Detectors

To compare these NSFW detectors fairly, we evaluated each tool based on the same criteria:

• Detection capabilities: The types of content the tool can detect, from explicit nudity to suggestive content, drawings, specific body parts, and violence.
• Ease of use: The steps required to check an image, whether you can upload an image and see a result right away, or need an API key or code.
• Classification categories: How results are split. A tool may return one NSFW probability, a handful of labels, or dozens of classes.
• Processing location: Where image analysis takes place, such as in your browser, on your own server, or in the provider's cloud.
• Pricing: Whether the tool is free, open source, has a free tier, or needs a paid plan, and what happens when you pass the limits.

Note that the information in this guide was reviewed as of October 2026. Features, pricing, free-tier limits, and model availability may change.

Part 1. Best NSFW Detectors at a Glance

Use this comparison table to shortlist the NSFW scanners that best match your needs. You can compare their types, free options, and use cases before exploring each tool in detail.

*) Cloud services and APIs may charge for usage beyond their free allowances.

Part 2. Best NSFW Image Detectors for Content Moderation

For more details on what each NSFW detector offers, let's take a closer look at the 10 tools below. You will find their key features, pricing, pros and cons, and the types of users or projects they are best suited for.

1. Is This Image NSFW?

Is This Image NSFW? is a simple online NSFW image checker to check whether the image looks safe or not safe for work. What you need to do is open the website, select an image, and check the result. It runs on the safety checker from Stable Diffusion, a component first built to filter AI-generated images.

2. Nyckel

Nyckel provides a pretrained NSFW image classifier that you can test on its website or connect to an application through an API. It sorts each image into one of five labels (NSFW porn, NSFW drawings, safe drawings, safe neutral content, and mildly suggestive safe content) and returns a confidence score.

3. NSFWJS

NSFWJS is a free NSFW detector built as an open-source JavaScript library by Infinite Red. It classifies images using TensorFlow.js, and runs in the client's browser, so images don't have to go to a server. Just load the pretrained model, pass it an image, and it returns a probability for each class. It also runs in Node.js if you would rather check images on your server.

4. Sightengine

Sightengine is a content moderation service that provides an NSFW detection API for websites, applications, and online platforms. It's designed to integrate with larger moderation systems and can identify nudity and other sexually suggestive content. The API returns classification results that developers can use to flag, filter, or send images for further review automatically.

5. Hive Moderation

Hive Moderation offers visual content moderation tools for businesses that need to review user-generated images and other media. Its visual moderation service can identify adult content alongside other categories of potentially harmful or unwanted material. You can integrate its services into your existing products and use the results to flag content for further review.

6. Amazon Rekognition Content Moderation

Amazon Rekognition is an AWS image and video analysis service with content moderation features. Its moderation API identifies potentially inappropriate content, including adult and suggestive content, violence, drugs, hate symbols, gambling, and disturbing content in images and video, and returns labels with confidence scores.

7. Google Cloud Vision SafeSearch

SafeSearch is the explicit content feature in Google Cloud Vision. It checks an image against five categories and returns how likely each one is to contain adult content, suggestive material, violence, medical imagery, or spoofed content. Its results use six likelihood levels, ranging from VERY_UNLIKELY to VERY_LIKELY.

8. NudeNet

NudeNet is an open-source, free NSFW detector tool for detecting nudity-related objects in images. Unlike classifiers that assign one overall NSFW score, its object detection models can identify specific body parts and return their locations in an image.

9. OpenNSFW2

OpenNSFW2 is an open-source NSFW detector Python implementation of Yahoo's original Open-NSFW model, built with Keras. It estimates the likelihood that an image contains pornographic content and provides functions for processing images and video frames. This NSFW detector focuses on pornography detection rather than a broad range of content moderation categories.

10. Falconsai/nsfw_image_detection

Falconsai/nsfw_image_detection is a pretrained image classification model hosted on Hugging Face. It predicts whether an image is classified as normal or NSFW. You can use it to filter explicit or inappropriate images in your own apps, such as an upload check that runs in a short Python script. The model is available for use with the Hugging Face Transformers library.

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Part 3. Generate AI Images Safely (No NSFW) with Filmora

An NSFW detector is aimed at flagging images after they have been created, but you can also take steps to avoid generating inappropriate content in the first place. If you create AI images and want to keep them safe for work (SFW), Wondershare Filmora offers an AI Image Generator with content filters that follow its content guidelines.

When a prompt contains keywords or requests that violate these guidelines, Filmora blocks the generation. It's a good example of how content filters can help prevent NSFW images before they're created.

If you need to prepare existing images or videos for sharing, Filmora also provides editing tools to help censor inappropriate content, such as:

• Apply blur effects to obscure sensitive details.
• Use mosaic effects (AI Face Mosaic) to pixelate sensitive areas, such as faces.
• Add overlays to cover unwanted content.

Creating SFW content takes more than filtering prompts. With Filmora, you can also edit and censor sensitive details to make your images and videos more suitable for sharing.

Conclusion

Whoever publishes or hosts images is responsible for what appears alongside them. The NSFW detectors we recommend here are built to help you check images before they go live. Some of them are free or even open source. You just need to choose one based on how many images you handle and where you want them processed.

For the images you create yourself, you can generate AI images in Filmora, which employs a safety filter for its AI generation that blocks prompts violating its content guidelines. Other than that, Filmora also offers blur, mosaic, and overlay effects that you can use to blur or cover sensitive details before you share your images and videos.

Try It Free Try It Free

Download the APP

Scan to get the Filmora App

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