.svg File Extension

What kind of file is an .svg?

An .svg file is a Scalable Vector Graphics image. It normally uses the image/svg+xml MIME type. Unlike a bitmap, it describes shapes, paths, text, gradients, and effects in XML. Logos, icons, diagrams, charts, and maps can therefore stay sharp across different display sizes.¹

SVG has no fixed magic byte sequence. A file may start with a byte-order mark, whitespace, a comment, an XML declaration, or the <svg> element itself. To identify one reliably, parse it as XML and confirm that its root is an svg element in the http://www.w3.org/2000/svg namespace.

How do I open an .svg on my computer?

Current web browsers display SVG directly, so Chrome, Edge, Firefox, or Safari is usually the quickest viewer.² Windows, macOS, Linux, iOS, and Android also have apps that use their browser or image-rendering support.

For editing:

• Inkscape uses SVG as its central vector format and can save either Inkscape SVG or plain SVG.³
• Adobe Illustrator opens and exports SVG, though unsupported editing features may be changed or rasterized on export.⁴
• A text or code editor works for small source changes, generated graphics, metadata, and accessibility labels.

An SVG may contain scripts, links, and external references when used as a document. Treat files from unknown sources cautiously and prefer a trusted, updated viewer. Browsers apply stricter behavior when SVG is loaded as an image, but those restrictions do not apply in every embedding context.⁵

Poly support for .svg

Poly gives SVG files thumbnails, a static in-app preview, available dimension metadata, visual search, and agent understanding. You can find an SVG by filename or appearance, and the Poly agent can reason about its rendered artwork.

Poly treats SVG as an image rather than searchable source code. Text elements are not indexed as document text. Animation, interaction, links, XML structure, and states outside the static rendering are not available to visual search or the agent. Fonts and externally linked assets can also render differently from the original authoring environment.

History of .svg

W3C published SVG 1.0 as a Recommendation on September 4, 2001.⁶ It established an open XML language for two-dimensional vector and mixed vector/raster graphics. SVG 1.1 followed, and SVG 2 continues the standard's development.

The specification recommends the lowercase .svg extension on every platform and registers image/svg+xml as its media type.¹ The related .svgz convention contains gzip-compressed SVG bytes. It needs decompression before XML parsing and should not be treated as an ordinary uncompressed .svg file.

Working with .svg and alternatives

Choose the format that fits the artwork and destination:

Export SVG to PNG when a recipient needs a fixed pixel size or cannot display SVG. Keep the SVG master if future resizing or path editing matters. Wrapping a photograph in SVG does not make its embedded pixels resolution-independent, and a complicated SVG can be larger or slower to render than a suitable raster image.²