Web images are affected by more than how they look in a folder. Width, height, file size, format, transparency, and animation can all change how an asset should be used. Checking those details before placement or compression helps catch oversized files and layout surprises.
Dimensions affect layout decisions
If the source image is too small, it may look soft on dense screens. If it is much larger than the display area, it may load more data than necessary. Comparing actual pixel size with the intended display size is the first useful check.
File size alone is not enough
A smaller file is not always the better file. Logos and UI screenshots need sharp edges, while photos can show artifacts in gradients and dark areas. File size should be read together with pixel count and visual quality.
Format details matter
- JPEG is useful for photos, but heavy compression can create artifacts
- PNG is useful for transparency and sharp edges, but can be large for photos
- WebP is useful for web delivery, but should fit the production workflow
- GIF may include animation, so check whether motion is intentional
- SVG should have the intended viewBox and display dimensions
Useful checks before publishing
- Unexpectedly large images are not mixed in
- The extension matches the actual format
- Alpha data exists where transparency is needed
- Animated GIF or WebP files are intentional
- File names and folder structure remain manageable
The TOOLPOOL Image Size and Format Inspector reads images in the browser and shows thumbnails, format, file size, pixel count, aspect ratio, transparency, and animation details in one place.