Count transparency in four pixels
Input and settings
Synthetic 2×2 PNG / A=0,128,255,255 / Alpha view
Expected result
Transparent 1 (25%), translucent 1 (25%), opaque 2 (50%).
Alpha & Transparency Checker
Switch backgrounds and inspect transparent, translucent, and opaque pixels.
How to use
- Choose an image to inspect.
- Choose Normal or Alpha view and a background, then run.
- Review the transparency breakdown and image edges.
Files and settings
You can also drop or paste images. Pasted images may not retain the original file metadata.
File contents and names are not stored or uploaded.
Up to about 134.2 MB and 70 MP per image, 268.4 MB of input in total, and 100.7 MB of output. Devices with limited memory may require smaller images.
Result
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Share only the tool name and public URL. Your input and results are not included.
Purpose and use
Inspect logo and cutout edges against white, black, or a custom background.
Example
Three pixels with alpha values of 0, 128, and 255 count as one transparent, one translucent, and one opaque pixel.
Interpreting the result
In alpha view, black is transparent, white is opaque, and gray is translucent. Percentages use the image’s total pixel count.
Limits and caveats
JPEG normally has no alpha, so every pixel is opaque. Changing the preview background does not alter the source.
Related workflow
Use Texture Channel Pack & Unpack to work with alpha as a separate channel map.
Try a use case and check the result
Distinguish the preview background from alpha values stored in the image.
Example buttons replace the inputs and settings above and calculate. Restore previous input steps back one example at a time. After trying multiple examples, repeat restore to return to your original input. This history is lost when the page closes.
A black background does not create transparency
Input and settings
Synthetic 2×2 PNG / All A=255 / Normal view, black background
Expected result
Transparent 0, translucent 0, opaque 4 (100%). Background choice does not change the counts.
How to read the result
A=0 is transparent, 1–254 translucent and 255 opaque. Alpha view visualizes A as grayscale. Black, white and checkerboard backgrounds affect only the preview, not the source image.
Scope and limits
Counts cover all browser-decoded pixels. JPEG is normally fully opaque. One JPEG/PNG/WebP, up to 128 MiB, 70 megapixels and 16,384 pixels per edge; low-memory devices may need smaller images. Restore returns the original file/view settings; run again.
Independently count known alpha values as 1/1/2 and 0/0/4; check localized display, backgrounds and original-file restoration.
Continue with the next task
Frequently asked questions
Will this change the original file?
No. Downloads are separate files. Closing the page discards the loaded content and results.
What do white, black and gray mean in Alpha view?
Black is transparent, white is opaque and gray is translucent. Percentages use the image’s total pixel count.
Why does a JPEG normally appear entirely opaque?
JPEG normally has no alpha channel. Without transparency information, every pixel is counted as opaque.
Related tools
Inputs and storage
Keep any content you need before clearing. This tool does not autosave inputs or results. Reloading or closing the page, clearing inputs or resetting may discard your work.
Favorites and language preferences are stored separately and may be lost when site data is cleared. Tool resets and site-data deletion do not delete files already downloaded to your device.