Make a GIF on Pixlr, a free online image editor, to create an image to use for a website. The GIF format presents two main advantages over the JPEG. It doesn't decrease in quality or "compress" when you save it; and the file size for GIF files are uniformly smaller than JPEGs of similar quality and physical dimensions. Convert an existing image to a GIF or create a new image and save it as a GIF.
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Load PIxlr in your Web browser and choose the option that best corresponds to your needs. Choose "Create a New Image" to start a new GIF from scratch or select "Open Image from Computer" or "Open Image from URL" to open and convert an existing image.
Use the Pixlr toolbar to make any modifications to the image you need prior to saving it as a GIF. For example, use the "Select" tool to choose the portion of the image you want to keep. Select "Crop" from the "Image" drop-down menu.
Select "Save" from the "File" drop-down menu and choose "GIF" from the list of formats. Give your file a name, then click "OK."