OnePassApps Image Studio: How the Quality Slider and PNG Re-encoding Change File Size

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The OnePassApps team, which builds app.onepassapps.com, measured its own in-browser Image Studio tool across twelve conversions of one source image. The Convert tab offers PNG, JPEG and WebP outputs, and the quality slider (10 to 100, default 86) appears only for the lossy formats. Converting a PNG to PNG kept every pixel identical yet produced a file 45% larger than the original. A JPEG at the default setting was 24% larger than its PNG source, with over a million channel values changed. The post notes that lossless means unchanged pixels, not a smaller file, and goes on to report results across six slider settings for each lossy format.

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