Client-Side WebP to PNG Converter: Five Lessons From Building One

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A developer needed to use a WebP logo in an older editor that rejected the format, and found that renaming the file does not actually convert it. The resulting weekend project was a browser-based converter that decodes images to pixels on a canvas and re-encodes them without uploading files. The author notes that converting lossy WebP to PNG cannot improve quality, since PNG only preserves the decoded image, including existing compression artefacts. The article also explains that transparency cannot survive a JPG conversion, so a background fill must be chosen, which is a design decision rather than a technical default. The author discloses building the tool, so the piece is a build log rather than a neutral review.

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