#146 · Background & Transparency Tool

Alpha Channel Viewer

Extract every pixel’s alpha value into a grayscale map: white means opaque, black means transparent, and gray shows partial transparency.

Image Tool

Local browser processing
px
px
%
Ad space

How to use this image tool

  1. Choose a browser-supported image and confirm its preview.
  2. Adjust the controls for the intended output.
  3. Process the image, inspect the result, then download the newly created file.

What this tool does

Extract every pixel’s alpha value into a grayscale map: white means opaque, black means transparent, and gray shows partial transparency.

The browser decodes the source, calculates the requested transformation, and writes a new output Blob.

Large canvases use substantial memory. Processing is limited to 50 megapixels and 16,000 pixels per side.

Supported formats

Current browser decoders reliably handle PNG, JPEG, and WebP. BMP is accepted by the BMP converter when the browser supports that BMP variant.

FormatSupport
PNG / JPEG / WebPCurrent browsers
GIFFirst frame only
SVG / HEIC / TIFFNot guaranteed

Tips for better results

  • Start from the largest clean source you have.
  • Inspect text and edges at 100% zoom.
  • Prefer PNG for transparency or hard graphic edges.

FAQ

Does alpha channel viewer upload my image?

No. Processing runs locally in your browser. The page does not need to send the selected image to a server.

Which image formats can I open?

PNG, JPEG, and WebP work in current browsers. Other formats work only when the browser can decode them.

Why can a very large image fail?

Browsers limit canvas dimensions and available memory. This tool stops requests above 50 megapixels or 16,000 pixels per side.

Will image metadata be kept in the download?

Usually not. Canvas export creates a new file and normally omits EXIF and other source metadata.

Can I use the result for print or social media?

Yes, when the displayed pixel dimensions meet your destination requirements. Always inspect the downloaded file before publishing or printing.

Processing details

StageMethod
DecodeBrowser image decoder
ProcessCanvas 2D
ExportNew Blob

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