Editing SVG (section)

=== Compression ===

SVG images, being XML, contain many repeated fragments of text, so they are well suited for [[Data compression#Lossless|lossless data compression]] algorithms. When an SVG image has been compressed with the [[gzip]] algorithm, it is referred to as an "SVGZ" image and uses the corresponding <code>.svgz</code> filename extension. Conforming SVG 1.1 viewers will display compressed images.<ref>See {{URL|http://www.w3.org/TR/SVG11/conform.html#ConformingSVGViewers}} which states, "SVG implementations must correctly support gzip-encoded [{{IETF RFC|1952}}] and deflate-encoded [{{IETF RFC|1951}}] data streams, for any content type (including SVG, script files, images)."</ref> An SVGZ file is typically 20 to 50 percent of the original size.<ref>{{cite web |date=14 July 2009 |title=Saving compressed SVG (SVGZ) |url=https://www.adobe.com/svg/illustrator/compressedsvg.html |archive-url=https://web.archive.org/web/20100601125817/https://www.adobe.com/svg/illustrator/compressedsvg.html |archive-date=1 June 2010 |access-date=24 February 2010 |work=SVG Zone |publisher=[[Adobe Systems]]}}</ref> W3C provides SVGZ files to test for conformance.<ref>For example, {{URL|http://dev.w3.org/SVG/profiles/1.1F2/test/harness/htmlObject/conform-viewers-01-t.html}}</ref>