diff --git a/config/config.go b/config/config.go
index a6c1cc9..af2f6e9 100644
--- a/config/config.go
+++ b/config/config.go
@@ -3,8 +3,10 @@ package config
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"log"
 	"os"
+	"strings"
 
 	"gopkg.in/yaml.v2"
 )
@@ -35,15 +37,20 @@ type Config struct {
 
 func DefaultConfig() *Config {
 	defaultConfig := Config{}
-	stdProfile := DownloadProfile{Name: "standard youtube-dl video", Command: "youtube-dl", Args: []string{
+	stdProfile := DownloadProfile{Name: "standard video", Command: "youtube-dl", Args: []string{
 		"--newline",
 		"--write-info-json",
 		"-f",
 		"bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best",
 	}}
+	mp3Profile := DownloadProfile{Name: "standard mp3", Command: "youtube-dl", Args: []string{
+		"–extract-audio",
+		"--audio-format", "mp3",
+		"--prefer-ffmpeg",
+	}}
 
 	defaultConfig.DownloadProfiles = append(defaultConfig.DownloadProfiles, stdProfile)
-	defaultConfig.DownloadProfiles = append(defaultConfig.DownloadProfiles, stdProfile)
+	defaultConfig.DownloadProfiles = append(defaultConfig.DownloadProfiles, mp3Profile)
 
 	defaultConfig.Server.Port = 6123
 	defaultConfig.Server.Address = "http://localhost:6123"
@@ -64,11 +71,59 @@ func (c *Config) UpdateFromJSON(j []byte) error {
 		log.Printf("Unmarshal error in config: %v", err)
 		return err
 	}
-	log.Printf("Config is unmarshalled ok")
 
-	// other checks
+	// sanity checks
 	if newConfig.UI.PopupHeight < 100 || newConfig.UI.PopupHeight > 2000 {
-		return errors.New("bad popup height")
+		return errors.New("invalid popup height - should be 100-2000")
+	}
+	if newConfig.UI.PopupWidth < 100 || newConfig.UI.PopupWidth > 2000 {
+		return errors.New("invalid popup width - should be 100-2000")
+	}
+
+	// check listen port
+	if newConfig.Server.Port < 1 || newConfig.Server.Port > 65535 {
+		return errors.New("invalid server listen port")
+	}
+
+	// check download path
+	fi, err := os.Stat(newConfig.Server.DownloadPath)
+	if os.IsNotExist(err) {
+		return fmt.Errorf("path '%s' does not exist", newConfig.Server.DownloadPath)
+	}
+	if !fi.IsDir() {
+		return fmt.Errorf("path '%s' is not a directory", newConfig.Server.DownloadPath)
+	}
+
+	// check profile name uniqueness
+	for i, p1 := range newConfig.DownloadProfiles {
+		for j, p2 := range newConfig.DownloadProfiles {
+			if i != j && p1.Name == p2.Name {
+				return fmt.Errorf("duplicate download profile name '%s'", p1.Name)
+			}
+		}
+	}
+
+	// remove leading/trailing spaces from args and commands and check for emptiness
+	for i := range newConfig.DownloadProfiles {
+		newConfig.DownloadProfiles[i].Name = strings.TrimSpace(newConfig.DownloadProfiles[i].Name)
+
+		if newConfig.DownloadProfiles[i].Name == "" {
+			return errors.New("profile name cannot be empty")
+		}
+
+		newConfig.DownloadProfiles[i].Command = strings.TrimSpace(newConfig.DownloadProfiles[i].Command)
+		if newConfig.DownloadProfiles[i].Command == "" {
+			return fmt.Errorf("command in profile %s cannot be empty", newConfig.DownloadProfiles[i].Name)
+		}
+
+		// check the args
+		for j := range newConfig.DownloadProfiles[i].Args {
+			newConfig.DownloadProfiles[i].Args[j] = strings.TrimSpace(newConfig.DownloadProfiles[i].Args[j])
+			if newConfig.DownloadProfiles[i].Args[j] == "" {
+				return fmt.Errorf("argument %d of profile %s is empty", j+1, newConfig.DownloadProfiles[i].Name)
+			}
+		}
+
 	}
 
 	*c = newConfig
@@ -137,12 +192,14 @@ func (c *Config) WriteConfig() {
 	file, err := os.Create(
 		path,
 	)
+
 	if err != nil {
 		log.Fatalf("Could not open config file")
 	}
+	defer file.Close()
 
 	file.Write(s)
 	file.Close()
 
-	log.Printf("Stored in %s", path)
+	log.Printf("Wrote configuration out to %s", path)
 }
diff --git a/main.go b/main.go
index c95faed..fe260e5 100644
--- a/main.go
+++ b/main.go
@@ -161,8 +161,8 @@ func ConfigRESTHandler(w http.ResponseWriter, r *http.Request) {
 			w.Write(errorResB)
 			return
 		}
+		conf.WriteConfig()
 	}
-	conf.WriteConfig()
 	b, _ := json.Marshal(conf)
 	w.Write(b)
 }
diff --git a/web/config.html b/web/config.html
index 5a7c75b..937550d 100644
--- a/web/config.html
+++ b/web/config.html
@@ -3,18 +3,13 @@
 
 <div x-data="config()" x-init="fetch_config();">
 
-    <h2>gropple config</h2>
+    <p class="error" x-text="error_message"></p>
+    <p class="success" x-text="success_message"></p>
 
-    <p x-text="error_message"></p>
-
-    <p x-show="version && version.upgrade_available">
-        <a href="https://github.com/tardisx/gropple/releases">Upgrade is available</a> - 
-        you have 
-        <span x-text="version.current_version"></span> and 
-        <span x-text="version.github_version"></span>
-    is available.</p>
+    <p>Changes are not saved until "Save Changes" is pressed at the bottom of the page.</p>
 
     <div class="pure-g">
+
         <div class="pure-u-md-1-2 pure-u-1">
    
             <form class="pure-form pure-form-stacked gropple-config">
@@ -64,8 +59,12 @@
 
                     <template x-for="(profile, i) in config.profiles">
                         <div>
-                            <label x-bind:for="'config-profiles-'+i+'-name'">Name of profile <span x-text="i+1"></span></label>
+                            <label x-bind:for="'config-profiles-'+i+'-name'">Name of profile <span x-text="i+1"></span>
+                            </label>                                
+                            
                             <input type="text" x-bind:id="'config-profiles-'+i+'-name'" class="input-long" placeholder="name" x-model="profile.name" />
+                            <button class="pure-button button-del" href="#" @click.prevent="config.profiles.splice(i, 1);;">delete profile</button>
+
                             <span class="pure-form-message">The name of this profile. For your information only.</span>
 
                             <label x-bind:for="'config-profiles-'+i+'-command'">Command to run</label>
@@ -78,18 +77,19 @@
                             <template x-for="(arg, j) in profile.args">
                                 <div>
                                     <input type="text" x-bind:id="'config-profiles-'+i+'-arg-'+j" placeholder="arg" x-model="profile.args[j]" />
-                                    <button class="pure-button button-del" href="#" @click.prevent="profile.args.splice(j, 1);;">del</button>
+                                    <button class="pure-button button-del" href="#" @click.prevent="profile.args.splice(j, 1);;">delete arg</button>
                                 </div>
                             </template>
 
                             <button class="pure-button button-add" href="#" @click.prevent="profile.args.push('');">add arg</button>
 
-
                             <hr>
 
                         </div>
                     </template>
 
+                    <button class="pure-button button-add" href="#" @click.prevent="config.profiles.push({name: 'new profile', command: 'youtube-dl', args: []});">add profile</button>
+
                 </fieldset>
             </form>
         </div>
@@ -110,8 +110,8 @@
     function config() {
         return { 
             config: { server : {}, ui : {}, profiles: [] }, 
-            version: {},
             error_message: '',
+            success_message: '',
 
             fetch_config() {
                 fetch('/rest/config')
@@ -124,7 +124,6 @@
                 });
             },
             save_config() {
-                console.log(this.config);
                 let op = {
                    method: 'POST',
                     body: JSON.stringify(this.config),
@@ -132,18 +131,22 @@
                 }
                 fetch('/rest/config', op)
                 .then(response => {
-                  if (response.status >= 200 && response.status <= 299) {
-                      return response.json();
-                  } else {
-                    throw Error(response);
-                  }})
-                .then(config => {
-                    console.log('fixing object');
-                    this.config = config;
+                    return response.json();
+                })
+                .then(response => {
+                    if (response.error) {
+                        this.error_message = response.error;
+                        this.success_message = '';
+                        document.body.scrollTop = document.documentElement.scrollTop = 0;
+                    } else {
+                        this.error_message = '';
+                        this.success_message = 'configuration saved';
+                        document.body.scrollTop = document.documentElement.scrollTop = 0;
+                        this.config = response;
+                    }
                 })
                 .catch(error => {
-                    this.error_message = error.error;
-                    console.log('failed to update config', error);
+                    console.log('exception' ,error);
                 });
             }
         }
diff --git a/web/index.html b/web/index.html
index 243a08a..3536958 100644
--- a/web/index.html
+++ b/web/index.html
@@ -3,9 +3,7 @@
 
 <div x-data="index()" x-init="fetch_data(); fetch_version()">
 
-    <h2>gropple</h2>
-
-    <p x-show="version && version.upgrade_available">
+    <p x-cloak x-show="version && version.upgrade_available">
         <a href="https://github.com/tardisx/gropple/releases">Upgrade is available</a> - 
         you have 
         <span x-text="version.current_version"></span> and 
diff --git a/web/layout.tmpl b/web/layout.tmpl
index c82f1fb..63cd3a7 100644
--- a/web/layout.tmpl
+++ b/web/layout.tmpl
@@ -36,11 +36,21 @@
             padding-top: .5em;
             padding-bottom: 1.5em;
         }
+        .error {
+            color: red;
+        }
+        .success {
+            color: green;
+        }
+
+
+        [x-cloak] { display: none !important; }
 
     </style>
 </head>
 <body style="margin:4; padding:4">
     <div class="pure-menu pure-menu-horizontal" style="height: 2em;">
+        <a href="#" class="pure-menu-heading pure-menu-link">gropple</a>
         <ul class="pure-menu-list">
             <li class="pure-menu-item">
                 <a href="/" class="pure-menu-link">Home</a>