Image Metadata Inspector

When you pick an image, the browser exposes its intrinsic natural size as soon as the bytes finish decoding. We read those bytes once into memory, walk a tiny parser to extract an embedded ICC profile description if one is present (PNG iCCP chunk, JPEG APP2 / ICC_PROFILE markers), and we reduce the width × height to its lowest-terms ratio using the greatest common divisor.

Format detection uses the browser's reported MIME type, not the file extension — that way the table is always honest about what's inside the bytes. SVG is special: it's a vector format, so its "intrinsic size" is the viewBox. AVIF and HEIC almost always embed an ICC profile; PNG and WebP optionally do; JPEG sometimes does; GIF and BMP never do.

The file never leaves your browser. We use the FileReader API to read the bytes locally, an HTMLImageElement to decode them, and a <canvas> to render the preview. No fetch, no XMLHttpRequest, no upload.