Open modelsStable Diffusion detector

Stable Diffusion tools write their full settings into every PNG they save.

AI image detector

ChatGPT, Gemini, Midjourney, Flux and more

What it checks

Content CredentialsC2PA and IPTC labels
Generator fingerprintsSettings AI tools save
Camera dataMake, model and exposure
Visual inspectionHands, text, light, texture

Private. The file is checked on your device.

Drop an image to get a verdict

It names the AI that made it when the file says so, and checks the pixels when it does not.

AI

ChatGPT

Content Credentials in the file

AI

Stable Diffusion

The full prompt, read back

AI

Gemini

IPTC label in the metadata

Real

Camera photo

Make, model and exposure

  • Free, no sign-up
  • Images and video
  • Names the AI that made it
  • Private: files stay on your device

Open the full detector

In short

Stable Diffusion tools write their full settings into every PNG they save. Drop an image and Gireta reads them back: the prompt, negative prompt, seed, sampler, steps and model from Automatic1111, Forge and Fooocus, or the whole node graph from ComfyUI. Files without settings get the full visual inspection.

Where open-model tools store the prompt

ToolFieldWhat it holds
Automatic1111, Forge, FooocusPNG text chunk “parameters”Prompt, negative prompt, steps, sampler, CFG scale, seed, model
ComfyUIPNG text chunks “prompt” and “workflow”The full node graph, including the model file
InvokeAI“invokeai_metadata”Prompt and generation settings
NovelAI“Software” and “Comment”The tool name and settings

These blocks survive downloads of the original PNG. Converting to JPEG or posting to social apps removes them.

How the check works

  1. 1

    Content Credentials and IPTC

    We read the file's C2PA manifest and XMP metadata for the IPTC digital source type. “Trained algorithmic media” means a generator made it; “composite with trained algorithmic media” means AI edited a photo.

  2. 2

    Generator fingerprints

    Stable Diffusion, ComfyUI, InvokeAI and NovelAI write their settings into PNG files, and many tools name themselves in the software field. We read every text chunk and EXIF field.

  3. 3

    Camera data

    Real cameras record make, model, lens and exposure settings. We read them all and weigh them with everything else.

  4. 4

    Close visual inspection

    A vision model inspects the image for the tells generators leave: hands, teeth, text, reflections, repeated backgrounds and over-smooth skin.

Why Gireta catches what single-model detectors miss

Most detectors run one classifier over the pixels and hand back a score. Gireta starts where the proof is: the signatures AI tools embed in their own files. When ChatGPT, Gemini, Firefly, Sora or Stable Diffusion have labelled an image, Gireta reads that label, confirms the verdict and names the tool.

When the labels have been stripped, four more layers run: generator fingerprints in the file, camera data, a close visual inspection of hands, text, light and texture, and forensic views of the pixels. The verdict comes with the evidence behind it, so you can show your work.

And it all runs in your browser, so you can check sensitive images without uploading them anywhere.

More ways to check

Images

AI image detectorCheck if an image is AI-generated, free. Reads Content Credentials, IPTC labels and generator settings from ChatGPT, Gemini, Midjourney and Stable Diffusion, then inspects the pixels.How to tell if an image is AI generatedTen ways to tell if an image is AI-generated, from the strongest evidence (Content Credentials, metadata, SynthID) to the visual tells in hands, text and light.Content Credentials (C2PA) checkerCheck an image's Content Credentials (C2PA) and IPTC source type online, free. See if it was made or edited with AI, and which tool made it.AI image metadata checkerSee an image's hidden metadata: the Stable Diffusion or ComfyUI prompt, EXIF camera data, XMP and C2PA. Free, in your browser, with error level analysis.ChatGPT image detectorCheck if an image was made with ChatGPT, GPT Image or DALL·E. Reads OpenAI's Content Credentials and inspects the image, free and private.Gemini and Nano Banana image detectorCheck if an image was made with Google Gemini, Nano Banana or Imagen. Reads C2PA and IPTC labels in your browser and explains SynthID.Midjourney detectorCheck if an image was made with Midjourney. Reads IPTC labels and prompt text, then inspects the image for Midjourney's look. Free and private.Flux image detectorCheck if an image was made with Flux. Reads ComfyUI and Forge workflows from the file, names the model, and inspects the image. Free and private.Grok image detectorCheck if an image was made with Grok on X. Reads any embedded labels and inspects the image for the tells of AI generation. Free and private.

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Questions

How do I see the prompt of a Stable Diffusion image?

Drop the original PNG into Gireta. The prompt, seed and settings appear in full under Generator fingerprints, and every raw field is listed below.

Can it tell SDXL from SD 1.5?

When the file names the checkpoint, yes: the model field shows exactly which one was used.

Do you keep my image?

No. The file is read in your browser and never uploaded. For the visual check, a small preview (at most 1024 pixels wide) is sent, inspected and discarded.

Sources

Last updated October 19, 2026.