Image Info
Check an image’s dimensions, format, file size, aspect ratio and megapixels. Inspect JPG, PNG and WebP locally without uploading the file.
Free · No account required · Browser-basedDrop your image here
One small step to your next great image.
JPEG, PNG, WebP · Up to 25 MiB · 24 megapixels · 10,000 px per sideLimits help protect your browser’s memory.
Local processing. Images selected for this tool are processed in your browser and are not uploaded to 4ool servers. Learn more
How it works
Select one supported image from your device.
Read its file details, dimensions, aspect ratio and megapixel count.
Choose a related tool if you need to resize, compress or inspect EXIF metadata.
Read the dimensions before you edit
Width and height describe the image’s pixel grid. Together they help you decide whether it is large enough for a particular layout or unnecessarily large for a small display area.
File size is a separate measurement of the encoded file. A photo with many subtle textures can take more bytes than a simple graphic with the same dimensions. Neither dimensions nor file size alone is a complete measure of quality.
Aspect ratio and megapixels
Aspect ratio expresses width compared with height, reduced to the smallest whole-number ratio where possible. It makes it easier to compare image shapes without focusing on their exact resolution.
Megapixels are calculated as width multiplied by height, divided by one million. For example, 4032 × 3024 is approximately 12.19 megapixels. The number counts pixels; it does not measure lens sharpness, compression quality or useful detail.
Extension, MIME type and actual image format
The extension is the suffix in the filename, such as .jpeg or .png. MIME type is the file type reported by the browser. This tool also validates the image format, because a filename alone is not reliable evidence of what a file contains.
JPG and JPEG are two common names for the same image format. Renaming a .webp file to .jpg does not convert it; use a converter to create a correctly encoded file.
File details are different from EXIF
Basic image information is available even when a picture has no camera metadata. Details such as camera model, exposure, capture date and GPS coordinates belong to metadata and may not be present.
Use EXIF Viewer to inspect those embedded fields. Opening an image here does not change it or upload the selected file to 4ool servers.
Frequently asked questions
Are JPG and JPEG different formats?
No. Both extensions identify JPEG images. The tools accept .jpg and .jpeg.
Does a larger megapixel count mean better quality?
It means more pixels, but sharpness and visible detail also depend on the source image, processing and compression.
Why are file size and dimensions both shown?
Dimensions describe the pixel grid; file size measures the encoded data. They answer different questions about display size and storage.
Does inspecting a file modify it?
No. Image Info reads the selected file locally. It does not overwrite the original or generate an edited image.