Image Format & Info Checker — Free Online Tool
Inspect a browser-decodable image's MIME type, pixel dimensions, aspect ratio, file size, megapixel count, and sampled transparency. The format label comes from the file's reported MIME type rather than forensic signature detection; the image never leaves your browser.
100% client-side. No uploads. Your data never leaves your browser.
How to use Image Format & Info Checker
- Upload any image file.
- Format and dimensions appear instantly.
- Check aspect ratio and megapixel count.
- See if the image has transparency.
Frequently Asked Questions
What information does this show?
Reported MIME format, decoded pixel dimensions, aspect ratio, file size, megapixels, and a transparency sample.
How is transparency detected?
The decoded image is scaled to a canvas sample of at most 100×100 pixels and checked for alpha below 255. Treat the result as a quick inspection, not forensic file validation.
How is this different from Image Metadata Viewer?
Image Metadata Viewer shows EXIF camera data. Image Format Checker shows image structure data (dimensions, format, size).
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