Extract Image Channels
Export red, green, blue, alpha or estimated brightness as grayscale PNG.
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
An alpha mask is white for opaque pixels and black for transparent ones. It is a raster mask, not a selection or vector path.
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
Select the channel to inspect and export.
- 03
Review the result and download the file.
Details and tips
How it works
RGB and estimated brightness become grayscale while keeping original alpha. Alpha extraction instead writes opacity as visible gray and makes the output fully opaque.
Made for everyday images
Inspect transparency, prepare masks and compare individual color channels.
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.