diff --git a/src/flamegraph/flamegraph.css b/src/flamegraph/flamegraph.css
index 42e9d535..aa6bcb0a 100644
--- a/src/flamegraph/flamegraph.css
+++ b/src/flamegraph/flamegraph.css
@@ -1,6 +1,8 @@
 #matched { text-anchor:end; }
 #search { text-anchor:end; opacity:0.1; cursor:pointer; }
 #search:hover, #search.show { opacity:1; }
+#ignorecase { text-anchor:end; opacity:0.1; cursor:pointer; }
+#ignorecase:hover, #ignorecase.show { opacity:1; }
 #subtitle { text-anchor:middle; font-color:rgb(160,160,160); }
 #unzoom { cursor:pointer; }
 #frames > *:hover { stroke:black; stroke-width:0.5; cursor:pointer; }
diff --git a/src/flamegraph/flamegraph.js b/src/flamegraph/flamegraph.js
index 7c8e41e1..8ccb6a71 100644
--- a/src/flamegraph/flamegraph.js
+++ b/src/flamegraph/flamegraph.js
@@ -1,8 +1,9 @@
 "use strict";
-var details, searchbtn, unzoombtn, matchedtxt, svg, searching, frames, known_font_width;
+var details, searchbtn, ignorecasebtn, unzoombtn, matchedtxt, svg, searching, frames, known_font_width, case_insensitive, current_search_term;
 function init(evt) {
     details = document.getElementById("details").firstChild;
     searchbtn = document.getElementById("search");
+    ignorecasebtn = document.getElementById("ignorecase");
     unzoombtn = document.getElementById("unzoom");
     matchedtxt = document.getElementById("matched");
     svg = document.getElementsByTagName("svg")[0];
@@ -10,14 +11,22 @@ function init(evt) {
     known_font_width = get_monospace_width(frames);
     total_samples = parseInt(frames.attributes.total_samples.value);
     searching = 0;
+    case_insensitive = 0;
+    current_search_term = null;
 
     // Use GET parameters to restore a flamegraph's state.
     var restore_state = function() {
         var params = get_params();
         if (params.x && params.y)
             zoom(find_group(document.querySelector('[*|x="' + params.x + '"][y="' + params.y + '"]')));
-        if (params.s)
+        if (params.s) {
+            if (params.ic) {
+                case_insensitive = 1;
+                ignorecasebtn.classList.add("show");
+            }
+            current_search_term = params.s;
             search(params.s);
+        }
     };
 
     if (fluiddrawing) {
@@ -41,7 +50,8 @@ function init(evt) {
 
             // Keep search elements at a fixed distance from right edge.
             var svgWidth = svg.width.baseVal.value;
-            searchbtn.attributes.x.value = svgWidth - xpad;
+            ignorecasebtn.attributes.x.value = svgWidth - xpad;
+            searchbtn.attributes.x.value = svgWidth - xpad - fontsize * fontwidth * 4;
             matchedtxt.attributes.x.value = svgWidth - xpad;
         };
         window.addEventListener('resize', function() {
@@ -87,6 +97,7 @@ window.addEventListener("click", function(e) {
         history.replaceState(null, null, parse_params(params));
     }
     else if (e.target.id == "search") search_prompt();
+    else if (e.target.id == "ignorecase") toggle_ignorecase();
 }, false)
 // mouse-over for info
 // show
@@ -106,6 +117,13 @@ window.addEventListener("keydown",function (e) {
         search_prompt();
     }
 }, false)
+// ctrl-I to toggle case-insensitive search
+window.addEventListener("keydown",function (e) {
+    if (e.ctrlKey && e.keyCode === 73) {
+        e.preventDefault();
+        toggle_ignorecase();
+    }
+}, false)
 // functions
 function get_params() {
     var params = {};
@@ -371,18 +389,22 @@ function reset_search() {
     }
     var params = get_params();
     delete params.s;
+    delete params.ic;
     history.replaceState(null, null, parse_params(params));
 }
 function search_prompt() {
     if (!searching) {
+        var casemsg = case_insensitive ? ", ignoring case" : "";
         var term = prompt("Enter a search term (regexp " +
-            "allowed, eg: ^ext4_)", "");
+            "allowed, eg: ^ext4_)" + casemsg + "\nPress Ctrl+i to toggle case sensitivity", "");
         if (term != null) {
+            current_search_term = term;
             search(term)
         }
     } else {
         reset_search();
         searching = 0;
+        current_search_term = null;
         searchbtn.classList.remove("show");
         searchbtn.firstChild.nodeValue = "Search"
         matchedtxt.classList.add("hide");
@@ -390,7 +412,7 @@ function search_prompt() {
     }
 }
 function search(term) {
-    var re = new RegExp(term);
+    var re = new RegExp(term, case_insensitive ? "i" : "");
     var el = frames.children;
     var matches = new Object();
     var maxwidth = 0;
@@ -425,10 +447,20 @@ function search(term) {
             searching = 1;
         }
     }
-    if (!searching)
+    if (!searching) {
+        searchbtn.classList.remove("show");
+        searchbtn.firstChild.nodeValue = "Search";
+        matchedtxt.classList.add("hide");
+        matchedtxt.firstChild.nodeValue = "";
         return;
+    }
     var params = get_params();
     params.s = term;
+    if (case_insensitive) {
+        params.ic = "1";
+    } else {
+        delete params.ic;
+    }
     history.replaceState(null, null, parse_params(params));
 
     searchbtn.classList.add("show");
@@ -465,6 +497,19 @@ function search(term) {
     if (pct != 100) pct = pct.toFixed(1);
     matchedtxt.firstChild.nodeValue = "Matched: " + pct + "%";
 }
+function toggle_ignorecase() {
+    case_insensitive = !case_insensitive;
+    if (case_insensitive) {
+        ignorecasebtn.classList.add("show");
+    } else {
+        ignorecasebtn.classList.remove("show");
+    }
+    if (current_search_term != null) {
+        reset_search();
+        searching = 0;
+        search(current_search_term);
+    }
+}
 function format_percent(n) {
     return n.toFixed(4) + "%";
 }
diff --git a/src/flamegraph/svg.rs b/src/flamegraph/svg.rs
index 23d3924a..676fc77a 100644
--- a/src/flamegraph/svg.rs
+++ b/src/flamegraph/svg.rs
@@ -232,11 +232,30 @@ text {{ font-family:{}; font-size:{}px }}
         },
     )?;
 
+    {
+        let x = write!(buf, "{:.2}", image_width as usize - super::XPAD);
+        let y = write!(buf, "{:.2}", (opt.font_size * 2) as f64);
+        svg.write_event(Event::Start(BytesStart::new("text").with_attributes(
+            args!(
+                "id" => "ignorecase",
+                "fill" => &*style_options.uicolor,
+                "x" => &buf[x],
+                "y" => &buf[y]
+            ),
+        )))?;
+        svg.write_event(Event::Start(BytesStart::new("title")))?;
+        svg.write_event(Event::Text(BytesText::new("ignore case")))?;
+        svg.write_event(Event::End(BytesEnd::new("title")))?;
+        svg.write_event(Event::Text(BytesText::new("ic")))?;
+        svg.write_event(Event::End(BytesEnd::new("text")))?;
+    }
+
+    let ic_offset = (opt.font_size as f64 * opt.font_width * 4.0) as usize;
     write_str(
         svg,
         &mut buf,
         TextItem {
-            x: Dimension::Pixels(image_width as usize - super::XPAD),
+            x: Dimension::Pixels(image_width as usize - super::XPAD - ic_offset),
             y: (opt.font_size * 2) as f64,
             text: "Search".into(),
             extra: vec![("id", "search"), ("fill", &style_options.uicolor)],