diff --git a/src/main/java/com/team766/web/ConfigUI.java b/src/main/java/com/team766/web/ConfigUI.java
index ac16af09..a4768c9b 100644
--- a/src/main/java/com/team766/web/ConfigUI.java
+++ b/src/main/java/com/team766/web/ConfigUI.java
@@ -1,7 +1,9 @@
 package com.team766.web;
 
 import java.util.Map;
+import java.util.ArrayList;
 import com.team766.config.ConfigFileReader;
+import com.team766.config.ConfigValueParseException;
 
 public class ConfigUI implements WebServer.Handler {
 	@Override
@@ -10,17 +12,73 @@ public String endpoint() {
 	}
 
 	@Override
-	public String handle(final Map<String, Object> params) {
-		String r = "<h1>Configuration (READ ONLY)</h1>";
-		r += "<p>";
-		r += "To edit, copy contents and place in <code>src/main/deploy/configs</code> directory.<br/>";
-		r += "See <a href=\"https://docs.google.com/document/d/1eKOG5iWi2tijRls1L9qZ4xBZx50y1EriIk2QBUTv86g/edit#\">docs</a> for more information.<br/>";
-		r += "</p>";
+	public String handle(Map<String, Object> params) {
+		String r = "<h1>Configuration</h1>";
 
-		// TODO: handle empty config file case.
-		r += "<textarea name=\"configJson\" readonly disabled style=\"background: lightgray; box-sizing: border-box; width: 100%; height: 400px;\">";
-		r += ConfigFileReader.getInstance().getJsonString();
+		r += "<div id=\"results\">\n";
+		if (params.containsKey("configJson")) {
+			String configJsonString = (String)params.get("configJson");
+			ArrayList<String> validationErrors = new ArrayList<String>();
+			try {
+				ConfigFileReader.getInstance().reloadFromJson(configJsonString);
+			} catch (ConfigValueParseException ex) {
+				validationErrors.add(ex.toString());
+			} catch (Exception ex) {
+				validationErrors.add("Failed to parse config json: " + ex);
+			}
+			if (validationErrors.isEmpty()) {
+				r += "<p>New configuration (v" + ConfigFileReader.getInstance().getGeneration() + ") has been applied</p>";
+				r += "<p><b>Remember to click Restart Robot Code in the driver station if you have changed any motor/sensor settings</b></p>";
+				if (params.containsKey("saveToFile")) {
+					try {
+						ConfigFileReader.getInstance().saveFile(configJsonString);
+					} catch (Exception ex) {
+						validationErrors.add("Could not save config file: " + ex.toString());
+					}
+				}
+			}
+			if (validationErrors.size() > 0) {
+				r += "<p>Errors:\n";
+				r += "<ul>\n";
+				for (String error : validationErrors) {
+					r += "<li>" + error + "</li>\n";
+				}
+				r += "</ul></p>\n";
+			}
+		}
+		r += "</div>\n";
+
+		r += String.join("\n", new String[]{
+			"<script>",
+			"  function submitForm(oFormElement) {",
+			"    var xhttp = new XMLHttpRequest();",
+			"    xhttp.onreadystatechange = function() {",
+			"      if (this.readyState == 4 && this.status == 200) {",
+			"        var newDoc = new DOMParser().parseFromString(this.responseText, 'text/html')",
+			"        var oldDiv = document.getElementById('results');",
+			"        oldDiv.parentNode.replaceChild(",
+			"            document.importNode(newDoc.querySelector('#results'), true),",
+			"            oldDiv);",
+			"     }",
+			"    };",
+			"    xhttp.open(oFormElement.method, oFormElement.getAttribute('action'), true);",
+			"    xhttp.send(new URLSearchParams(new FormData(oFormElement)));",
+			"    return false;",
+			"  }",
+			"</script>",
+		});
+		
+		r += "<form method=\"post\" action=\"" + endpoint() + "\" onsubmit=\"return submitForm(this);\">\n";
+		r += "<textarea name=\"configJson\" style=\"box-sizing: border-box; width: 100%; height: 400px;\">";
+		if (params.containsKey("configJson")) {
+			r += (String)params.get("configJson");
+		} else {
+			r += ConfigFileReader.getInstance().getJsonString();
+		}
 		r += "</textarea>\n";
+		r += "<p>Save to config file on robot? <input type=\"checkbox\" name=\"saveToFile\"></p>\n";
+		r += "<p><input type=\"submit\" value=\"Apply\"></p></form>\n";
+		
 		return r;
 	}