33+ Svg File Xml Header SVG File. The recommended filename extension for these files is there are some gotchas at this stage though. Svg files come in two flavors. There are frameworks to build web applications in svg. Svg is an image format for vector graphics. It is compatible with xml 1.0. Basically, what you work with in adobe illustrator. As you save it, you'll get another dialog for svg options. The html parser in the browser will ignore them. It is mainly used in replacement to flash for creating graphics for the web. It literally means scalable vector graphics. Just to clarify when embedding an svg inside an html file, you could keep the prolog lines. The xml header lines should be removed when you are embedding an svg in an html page or another svg. Svg, scalable vector graphic, is a specification of documents to describe scalable 2d graphics in xml. Normal svg files are simple text files containing svg markup. You can save the file directly from adobe illustrator as an svg file.