#134 · Background & Transparency Tool

Check Image Transparency

Inspect decoded pixels to find fully or partially transparent areas, measure their share, and export a JSON transparency report.

Image Tool

Local image processing
The checker scans actual decoded alpha values. Large images may take a moment.
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How to use this image tool

  1. Choose an image.
  2. Adjust the available options.
  3. Select Check Transparency, review the result, and download the new file.

What this tool does

Every pixel alpha value is counted. The report distinguishes fully transparent, partially transparent, and fully opaque pixels.

Transparency share = pixels with alpha below 255 ÷ all pixels × 100

JPEG has no alpha channel. Animated images are inspected as the browser-decoded first frame.

Supported formats

The input picker lists formats relevant to this tool. Actual decoding still depends on your browser and the specific file variant.

InputOutput
image/png · image/webp · image/gifNew image or report file

Tips for better results

  • Keep the original until you have checked the download.
  • Test a smaller copy first when working on a memory-limited phone.
  • Inspect the preview at full size when pixel edges or text placement matter.

FAQ

Does Check Image Transparency upload my image?

No. Processing runs locally in the browser; selecting a file does not send it to Callimage.

Will Check Image Transparency keep image metadata?

Newly rendered images normally omit EXIF and other source metadata. Analysis reports include only the fields shown in the result.

Can I use Check Image Transparency on a phone?

Yes, in a modern browser, although large images can exceed mobile memory limits.

Why can an image fail to open?

The file may be damaged, mislabeled, use an unsupported codec variant, or exceed the browser’s decoding limits.

Does the downloaded result replace my original?

No. The browser creates a separate download and does not modify the source file on your device.

Processing details

PrivacyLocal browser processing
Large-image limit40 megapixels

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