Image Format & Info Checker — Free Online Tool
Upload any image to instantly see its format, pixel dimensions, aspect ratio, file size, megapixel count, and whether it has transparency. Uses browser APIs for all detection — 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?
Format (JPEG/PNG/WebP/etc.), pixel dimensions, aspect ratio, file size, megapixels, and transparency detection.
How is transparency detected?
The image is drawn to a canvas and a sample of pixels are checked for alpha < 255. This covers PNG and WebP transparency.
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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