Transparent PNG Maker — Alpha Cleaner
Convert any image to PNG with cleaned-up alpha: harden semi-transparency or preserve soft edges. Preview on checkerboard.
About the Transparent PNG Maker
Some tools and formats mishandle semi-transparent pixels. This alpha cleaner either hardens transparency to fully opaque/fully clear (binary alpha) or re-exports with the original soft gradient preserved — the fix for fuzzy halo problems.
How it works
The tool converts your image to PNG and gives you control over its alpha channel: the threshold slider sets where semi-transparent pixels snap to fully opaque or fully transparent, and binarize mode hardens every in-between value — ideal for cleaning up keys that left mushy edges.
How to use it
Drop one image, adjust the alpha threshold while watching the checkerboard preview, enable binarize for hard edges or leave it off to preserve soft anti-aliasing, then download.
Supported formats & limitations
Accepts .jpg, .png and .webp up to 30MB; single-image runs; output is always PNG (the only mainstream raster format with full alpha besides WebP). JPEG sources carry no alpha, so pair this with a background-removal tool first.
Common use cases
Cleaning up alpha from chroma-key exports, hardening soft selection edges from other editors, preparing sprites that need crisp alpha, and converting any image into a standards-compliant PNG asset.
Frequently asked questions
How private is Transparent PNG Maker?
Everything runs locally in your browser via the Canvas API. Your picture never leaves your machine — there is no upload step at all, so processing is as private as working in an offline editor.
Which file types are supported?
JPG, PNG or WEBP files up to 30 MB each are accepted. Drop a single file in (paste and drag also work), check the preview, and export in the format shown at the download step.
How many images can I process at once?
There are no artificial limits: use it as often as you like, free. The practical cap is 30 MB per image, and outputs stay watermark-free.
Can I fine-tune the result before downloading?
You can adjust Alpha threshold, Harden alpha (binary transparency). Results are previewed after processing, so tweak values and re-run until the output looks right.
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