How it works
Image Inspector shows what a file really is. The format comes from the file's own bytes, not its name — a PNG renamed to “.jpg” is reported as PNG. You also get dimensions (as displayed, after any EXIF rotation), aspect ratio, megapixels, file size, bit depth and colour model.
Raw pixel memory is how much memory the image needs once decoded (4 bytes per pixel) — the reason a 2 MB JPEG can still be too big for a phone to edit. Transparency is checked on the actual pixels, so an alpha channel that's fully opaque is reported as such.
Metadata lists EXIF fields, GPS presence (never the coordinates), XMP, IPTC, comments and the colour profile. Everything is read locally.
Worked example
A 4000 × 3000 JPEG is 12 MP and needs 48.0 MB of memory once decoded — even if the file itself is only 3 MB. A 48 MP (8000 × 6000) photo needs 192.0 MB.
Edge cases handled
- Wrong file extensions: the real format is shown, with a note.
- EXIF-rotated photos: both stored and displayed dimensions are shown.
- Animated GIF/WebP/APNG: frame count where available.
- Corrupted files: reported as corrupted if the browser can't decode them.
- Files over 64 MB: metadata is read from the first 4 MB.