diff --git a/core/modules/filters/format/titlelist.js b/core/modules/filters/format/titlelist.js
new file mode 100644
index 000000000..47608323d
--- /dev/null
+++ b/core/modules/filters/format/titlelist.js
@@ -0,0 +1,25 @@
+/*\
+title: $:/core/modules/filters/format/titlelist.js
+type: application/javascript
+module-type: formatfilteroperator
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.titlelist = function(source,operand,options) {
+	var results = [];
+	source(function(tiddler,title) {
+		if(title && title.length) {
+			results.push($tw.utils.stringifyList([title]));
+		}
+	});
+	return results;
+};
+
+})();
diff --git a/editions/test/tiddlers/tests/test-filters.js b/editions/test/tiddlers/tests/test-filters.js
index a02114f2b..ee428b1a0 100644
--- a/editions/test/tiddlers/tests/test-filters.js
+++ b/editions/test/tiddlers/tests/test-filters.js
@@ -808,6 +808,12 @@ function runTests(wiki) {
 	expect(wiki.filterTiddlers("'-25' +[escapecss[]]").join(",")).toBe("-\\32 5");
 	expect(wiki.filterTiddlers("'-' +[escapecss[]]").join(",")).toBe("\\-");
 	});
+	
+	it("should handle the format operator", function() {
+		expect(wiki.filterTiddlers("[[Hello There]] [[GettingStarted]] +[format:titlelist[]]").join(" ")).toBe("[[Hello There]] GettingStarted");
+		expect(wiki.filterTiddlers("[title[Hello There]] +[format:titlelist[]]").join(" ")).toBe("[[Hello There]]");
+		expect(wiki.filterTiddlers("[title[HelloThere]] +[format:titlelist[]]").join(" ")).toBe("HelloThere");		
+	});
 
 	it("should handle the deserializers operator", function() {
 	expect(wiki.filterTiddlers("[deserializers[]]").join(",")).toBe("application/javascript,application/json,application/x-tiddler,application/x-tiddler-html-div,application/x-tiddlers,text/css,text/html,text/plain");
diff --git a/editions/tw5.com/tiddlers/filters/examples/format Operator (Examples).tid b/editions/tw5.com/tiddlers/filters/examples/format Operator (Examples).tid
index 071d4506d..d7bbc1271 100644
--- a/editions/tw5.com/tiddlers/filters/examples/format Operator (Examples).tid	
+++ b/editions/tw5.com/tiddlers/filters/examples/format Operator (Examples).tid	
@@ -1,5 +1,5 @@
 created: 20201020102735123
-modified: 20201020104004306
+modified: 20210524044020645
 tags: [[Operator Examples]] [[format Operator]]
 title: format Operator (Examples)
 type: text/vnd.tiddlywiki
@@ -14,3 +14,18 @@ Created date with a format string supplied as operator parameter:
 
 Modified date shown as a relative date:
 <<.operator-example 3 "[[HelloThere]get[modified]format:relativedate[]]">>
+
+A tiddler title with spaces formatted as a title list:
+<<.operator-example 4 """[[Hello There]format:titlelist[]]""">>
+
+All tiddler titles tagged with <<tag TableOfContents>> formatted as a title list :
+<<.operator-example 5 """[tag[TableOfContents]format:titlelist[]]""">>
+
+<<.tip "To create a string to save a [[title list|Title List]] into a list field, use `format:titlelist[]` with the [[join operator|join Operator]]">>
+<<.operator-example 6 """[tag[TableOfContents]format:titlelist[]join[ ]]""">>
+For example, to save titles tagged `TableOfContents` to the titles field of the tiddler [[format titlelist test]]:
+
+<$macrocall $name='wikitext-example-without-html'
+src='<$button> test
+<$action-setfield $tiddler="format titlelist test" titles={{{ [tag[TableOfContents]format:titlelist[]join[ ]] }}}/>
+</$button>'/>
diff --git a/editions/tw5.com/tiddlers/filters/format.tid b/editions/tw5.com/tiddlers/filters/format.tid
index 8cf6f9826..138eb018f 100644
--- a/editions/tw5.com/tiddlers/filters/format.tid
+++ b/editions/tw5.com/tiddlers/filters/format.tid
@@ -1,6 +1,6 @@
 caption: format
 created: 20201020100834443
-modified: 20201020104004271
+modified: 20210524090002126
 op-input: a [[selection of titles|Title Selection]]
 op-output: input strings formatted according to the specified suffix <<.place B>>
 op-parameter: optional format string for the formats
@@ -19,5 +19,6 @@ The suffix <<.place B>> is one of the following supported string formats:
 |!Format |!Description |
 |^`date` |The input string is interpreted as a UTC date and displayed according to the DateFormat specified in the optional operator parameter. (Defaults to "YYYY MM DD 0hh:0mm") |
 |^`relativedate` |The input string is interpreted as a UTC date and displayed as the interval from the present instant. Any operator parameters are ignored. |
+|^`titlelist` |<<.from-version "5.2.0">>The input string wrapped in double square brackets if it contains a space. Appropriate for use in a [[title list|Title List]]. |
 
 <<.operator-examples "format">>