What is SVG? A Complete Guide to Scalable Vector Graphics
Learn what SVG files are, how they work, why they are superior for logos and icons, and how to create or convert images to SVG.
SVG stands for Scalable Vector Graphics. It is a file format for describing two-dimensional graphics using XML. Unlike raster formats (PNG, JPG), which store images as pixel grids, SVG stores images as a series of mathematical instructions. This makes SVG ideal for graphics that need to look sharp at any size.
A Brief History of SVG
SVG was developed by the World Wide Web Consortium (W3C) in the late 1990s as a standardized vector graphics format for the web. The first SVG specification was published in 2001. After years of inconsistent browser support, SVG became widely supported around 2011 and is now natively understood by all modern web browsers.
How SVG Works
An SVG file is plain XML text. It contains elements like <path>, <circle>, <rect>, and <text> that describe shapes and their properties (fill colour, stroke width, position, etc.). When a browser reads an SVG file, it renders these elements as a vector image. You can open an SVG file in a text editor and see the raw code.
SVG and CSS
One of SVG's most powerful features is its integration with CSS. You can style SVG elements with CSS just like HTML elements, including transitions and animations. This makes it easy to create icons that change colour on hover or logos that animate on page load — all without JavaScript.
SVG Use Cases
SVG is used for logos and brand marks, website icons and UI elements, data visualizations and charts, maps, animations, and any graphic element that needs to be crisp on high-resolution displays. Major companies including Google, Apple, Twitter, and GitHub use SVG extensively for their web interfaces.
Creating SVG Files
You can create SVG files with vector editors like Adobe Illustrator, Sketch, Figma, or the free Inkscape. You can also write SVG code by hand. And, as this tool demonstrates, you can convert raster images (PNG, JPG, etc.) to SVG using vectorization.
SVG is one of the most versatile and powerful formats in the web designer's toolkit. Its resolution independence, small file size for simple graphics, and CSS integration make it the default choice for logos, icons, and illustrations on the modern web.
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