Multiply the transparency of a local image and export a PNG at the same dimensions. The checkerboard is a preview background, not part of your file.
No export yet. Choose an image or load the synthetic example.
Original decoded alpha × declared opacity multiplier
Each original alpha is multiplied, then rounded to the nearest byte with half ties upward. At 50%, 255 becomes 128 and 128 becomes 64.
The checkerboard is preview-only. Export retains decoded dimensions, but browser color conversion, premultiplication and encoding can affect RGB. Source bytes, color profiles, metadata and hidden RGB are not guaranteed to survive.
ONE CLEAR WORKING QUESTION
A 50% multiplier halves existing opacity; it does not replace every pixel with the same alpha.
A 50% multiplier halves existing opacity; it does not replace every pixel with the same alpha.
THE FIELD NOTES
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
At 50%, an alpha of 255 becomes 128 and an alpha of 128 becomes 64. Dimensions stay unchanged.
Choose a still PNG, JPEG or WebP from your device, then enter an opacity multiplier from 0% to 100%. Every export starts from the original decoded pixels, so changing the multiplier does not repeatedly fade a previous export. Files must be no larger than 10 MiB, 12 million pixels or 10,000 pixels on either edge.
At 50%, an opaque alpha of 255 becomes 128; an existing alpha of 128 becomes 64. The export keeps its decoded dimensions. The checkerboard helps you inspect transparency and is never painted into the downloaded PNG.
Use the image color picker to inspect a pixel separately, and the image metadata checker to inspect the exported file facts. Neither proves a browser preserved the original color profile or metadata.
Browser decoding, color conversion and PNG encoding can affect RGB values, especially at tiny or zero alpha. This is an opacity edit, not a promise to preserve source bytes, color profiles, metadata or hidden RGB. Animated files, SVG and remote image URLs are not supported.
THE PRODUCT IS NEXT
Choose a still PNG, JPEG or WebP from your device, then enter an opacity multiplier from 0% to 100%. Every export starts from the original decoded pixels, so changing the multiplier does not repeatedly fade a previous export. Files must be no larger than 10 MiB, 12 million pixels or 10,000 pixels on either edge.
At 50%, an opaque alpha of 255 becomes 128; an existing alpha of 128 becomes 64. The export keeps its decoded dimensions. The checkerboard helps you inspect transparency and is never painted into the downloaded PNG.
Use the image color picker to inspect a pixel separately, and the image metadata checker to inspect the exported file facts. Neither proves a browser preserved the original color profile or metadata.
Browser decoding, color conversion and PNG encoding can affect RGB values, especially at tiny or zero alpha. This is an opacity edit, not a promise to preserve source bytes, color profiles, metadata or hidden RGB. Animated files, SVG and remote image URLs are not supported.
No. The multiplier acts on each original decoded alpha. An alpha of 255 becomes 128 and an alpha of 128 becomes 64 under the declared nearest-integer rule.
No. It only helps reveal transparency in the preview. The downloaded file is a genuine PNG at the decoded source dimensions, without the checkerboard.
No preservation guarantee is made. Browser decoding, color conversion, premultiplication and encoding can affect colors and metadata, especially at tiny or zero alpha.
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