Start with the job the image needs to do
No format is smallest for every image. A photograph has subtle color variation; a logo may contain flat areas and sharp edges. The destination also matters. Some forms accept only JPG, while modern websites can use WebP. Keep an original master so you can make different exports without repeatedly re-encoding a compressed copy.
JPG for everyday photographs
JPG uses lossy compression, which means the encoder discards some information to save space. Moderate quality settings often work well for photographs. High-contrast text and line art can show ringing or fuzzy edges. JPG has no transparent alpha channel. In DigitalDock BD, transparent pixels are placed over the background color you choose before the image is encoded.
PNG for sharp edges and transparency
PNG stores raster image information losslessly. It is often useful for screenshots, logos and diagrams. Lossless does not mean that enlarging a PNG adds real detail, nor does converting JPG to PNG repair past compression damage. Photographs saved as PNG can be large. DigitalDock BD’s quality control is disabled for PNG because the browser does not use it as a lossy quality setting.
WebP for efficient web delivery
WebP supports transparency and several encoding modes. This tool uses the browser’s WebP encoder with a quality control when available. A quality value of 100 should not be read as a guarantee of lossless output. Check the downloaded image in the application that will use it. If your browser cannot encode the requested format, DigitalDock BD reports the problem.
Compare the actual exports
Try two formats at the same dimensions and compare both file size and fine detail. A short animation or an SVG needs a different workflow: this tool accepts still JPG, PNG, WebP, HEIC/HEIF and browser-supported AVIF files. It exports a single raster image and does not preserve animation, vector paths, embedded editing layers or original metadata.
Ready to try it?
Choose a source image and compare the result in your browser.
Open the image workspace ↗