diff --git a/source/ddox/htmlgenerator.d b/source/ddox/htmlgenerator.d
index b1a5d53e..002857b7 100644
--- a/source/ddox/htmlgenerator.d
+++ b/source/ddox/htmlgenerator.d
@@ -16,6 +16,7 @@ import std.array;
 import std.digest.md;
 import std.format : formattedWrite;
 import std.string : startsWith, toLower;
+import std.traits : EnumMembers;
 import std.variant;
 import vibe.core.log;
 import vibe.core.file;
@@ -25,6 +26,7 @@ import vibe.inet.path;
 import vibe.http.server;
 import vibe.stream.wrapper : StreamOutputRange;
 import diet.html;
+import diet.traits : dietTraits;
 
 
 /*
@@ -232,11 +234,17 @@ class DocPageInfo {
 	}
 }
 
+@dietTraits
+struct DdoxDietTraits(HTMLOutputStyle htmlStyle) {
+	// fields and functions must be static atm., see https://github.com/rejectedsoftware/diet-ng/issues/33
+	enum HTMLOutputStyle htmlOutputStyle = htmlStyle;
+}
+
 void generateSitemap(OutputStream dst, Package root_package, GeneratorSettings settings, string delegate(in Entity) link_to, HTTPServerRequest req = null)
 {
 	dst.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
 	dst.write("<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">\n");
-	
+
 	void writeEntry(string[] parts...){
 		dst.write("<url><loc>");
 		foreach( p; parts )
@@ -305,7 +313,15 @@ void generateApiIndex(OutputStream dst, Package root_package, GeneratorSettings
 	info.node = root_package;
 
 	auto rng = StreamOutputRange(dst);
-	rng.compileHTMLDietFile!("ddox.overview.dt", req, info);
+	final switch (settings.htmlOutputStyle)
+	{
+		foreach (htmlOutputStyle; EnumMembers!HTMLOutputStyle)
+		case htmlOutputStyle:
+		{
+			rng.compileHTMLDietFile!("ddox.overview.dt", req, info, DdoxDietTraits!(htmlOutputStyle));
+			return;
+		}
+	}
 }
 
 void generateModulePage(OutputStream dst, Package root_package, Module mod, GeneratorSettings settings, string delegate(in Entity) link_to, HTTPServerRequest req = null)
@@ -319,7 +335,15 @@ void generateModulePage(OutputStream dst, Package root_package, Module mod, Gene
 	info.docGroups = null;
 
 	auto rng = StreamOutputRange(dst);
-	rng.compileHTMLDietFile!("ddox.module.dt", req, info);
+	final switch (settings.htmlOutputStyle)
+	{
+		foreach (htmlOutputStyle; EnumMembers!HTMLOutputStyle)
+		case htmlOutputStyle:
+		{
+			rng.compileHTMLDietFile!("ddox.module.dt", req, info, DdoxDietTraits!(htmlOutputStyle));
+			return;
+		}
+	}
 }
 
 void generateDeclPage(OutputStream dst, Package root_package, Module mod, string nested_name, DocGroup[] docgroups, GeneratorSettings settings, string delegate(in Entity) link_to, HTTPServerRequest req = null)
@@ -337,7 +361,15 @@ void generateDeclPage(OutputStream dst, Package root_package, Module mod, string
 	info.nestedName = nested_name;
 
 	auto rng = StreamOutputRange(dst);
-	rng.compileHTMLDietFile!("ddox.docpage.dt", req, info);
+	final switch (settings.htmlOutputStyle)
+	{
+		foreach (htmlOutputStyle; EnumMembers!HTMLOutputStyle)
+		case htmlOutputStyle:
+		{
+			rng.compileHTMLDietFile!("ddox.docpage.dt", req, info, DdoxDietTraits!(htmlOutputStyle));
+			return;
+		}
+	}
 }
 
 private bool cmpKind(in Entity a, in Entity b)
diff --git a/source/ddox/main.d b/source/ddox/main.d
index 4a29dd42..f146acf1 100644
--- a/source/ddox/main.d
+++ b/source/ddox/main.d
@@ -111,33 +111,32 @@ int cmdServeTest(string[] args)
 
 int setupGeneratorInput(ref string[] args, out GeneratorSettings gensettings, out Package pack)
 {
+	gensettings = new GeneratorSettings;
+	auto docsettings = new DdoxSettings;
+
 	string[] macrofiles;
 	string[] overridemacrofiles;
-	NavigationType navtype = NavigationType.ModuleTree;
-	string[] pack_order;
 	string sitemapurl = "http://127.0.0.1/";
-	MethodStyle file_name_style = MethodStyle.unaltered;
-	SortMode modsort = SortMode.protectionName;
-	SortMode declsort = SortMode.protectionInheritanceName;
 	bool lowercasenames;
 	bool hyphenate;
-	bool singlepageenum;
 	getopt(args,
 		//config.passThrough,
-		"decl-sort", &declsort,
-		"file-name-style", &file_name_style,
+		"decl-sort", &docsettings.declSort,
+		"file-name-style", &gensettings.fileNameStyle,
 		"hyphenate", &hyphenate,
 		"lowercase-names", &lowercasenames,
-		"module-sort", &modsort,
-		"navigation-type", &navtype,
+		"module-sort", &docsettings.moduleSort,
+		"navigation-type", &gensettings.navigationType,
 		"override-macros", &overridemacrofiles,
-		"package-order", &pack_order,
+		"package-order", &docsettings.packageOrder,
 		"sitemap-url", &sitemapurl,
 		"std-macros", &macrofiles,
-		"enum-member-pages", &singlepageenum,
+		"enum-member-pages", &gensettings.enumMemberPages,
+		"html-style", &gensettings.htmlOutputStyle,
 		);
+	gensettings.siteUrl = URL(sitemapurl);
 
-	if (lowercasenames) file_name_style = MethodStyle.lowerCase;
+	if (lowercasenames) gensettings.fileNameStyle = MethodStyle.lowerCase;
 
 	if( args.length < 3 ){
 		showUsage(args);
@@ -149,17 +148,8 @@ int setupGeneratorInput(ref string[] args, out GeneratorSettings gensettings, ou
 	if (hyphenate) enableHyphenation();
 
 	// parse the json output file
-	auto docsettings = new DdoxSettings;
-	docsettings.packageOrder = pack_order;
-	docsettings.moduleSort = modsort;
-	docsettings.declSort = declsort;
 	pack = parseDocFile(args[2], docsettings);
 
-	gensettings = new GeneratorSettings;
-	gensettings.siteUrl = URL(sitemapurl);
-	gensettings.navigationType = navtype;
-	gensettings.fileNameStyle = file_name_style;
-	gensettings.enumMemberPages = singlepageenum;
 	return 0;
 }
 
@@ -356,6 +346,7 @@ Use <COMMAND> -h|--help to get detailed usage information for a command.
     --decl-sort=MODE       The sort order used for declaration lists
     --web-file-dir=DIR     Make files from dir available on the served site
     --enum-member-pages    Generate a single page per enum member
+    --html-style=STYLE     Sets the HTML output style, either compact (default) or pretty.
     --hyphenate            hyphenate text
  -h --help                 Show this help
 
@@ -385,6 +376,7 @@ protectionInheritanceName
                            This option is useful on case insensitive file
                            systems.
     --enum-member-pages    Generate a single page per enum member
+    --html-style=STYLE     Sets the HTML output style, either compact (default) or pretty.
     --hyphenate            hyphenate text
  -h --help                 Show this help
 
diff --git a/source/ddox/settings.d b/source/ddox/settings.d
index 33ef02d1..32d029eb 100644
--- a/source/ddox/settings.d
+++ b/source/ddox/settings.d
@@ -8,6 +8,7 @@
 module ddox.settings;
 
 import vibe.inet.url;
+import diet.html : HTMLOutputStyle;
 public import vibe.web.common : MethodStyle;
 
 enum SortMode {
@@ -50,6 +51,8 @@ class GeneratorSettings {
 	MethodStyle fileNameStyle = MethodStyle.unaltered;
 	/// Enables syntax highlighting for inline code
 	bool highlightInlineCode = true;
+	/// Select HTML style (e.g. compact, pretty)
+	HTMLOutputStyle htmlOutputStyle = HTMLOutputStyle.compact;
 
 	/// Creates a page per enum member instead of putting everything into a single table.
 	bool enumMemberPages;