Image Exposure Checker
Locate deep shadows and bright highlights directly on your image.
Drop your image here
Drag and drop, or choose a file below
JPG · PNG · WEBP
Up to 250 MB · One image at a time
Each image: up to 16 megapixels and 8192 px per side
This inspects decoded 8-bit pixels, not RAW sensor exposure. Blue and red are review overlays; downloading saves the annotated image. Luma is rounded weighted sRGB brightness.
Original
Choose an image or try the sample to see your preview here.
100% local processing
How to use
- 01
Choose an image or try the local sample.
- 02
Choose luma or channel inspection, set thresholds and adjust overlay opacity.
- 03
Review the result and download the file.
Details and tips
How it works
Blue marks values at or below the shadow threshold; red marks values at or above the highlight threshold. Channel mode checks the maximum RGB channel. Percentages count nontransparent pixels equally.
Made for everyday images
Review highlight loss, single-channel clipping and dark regions before publishing photos.
Frequently asked questions
Are images uploaded?
No. Processing, previews and downloads stay on your device.
What are the limits?
JPG, PNG and WebP, up to 250 MB, 8192 pixels per side and 16 million pixels. Expanded output must also fit these limits. Animation uses one still frame.