diff --git a/desktop/sources/scripts/generator.js b/desktop/sources/scripts/generator.js
index a35cc4a..e8e39aa 100644
--- a/desktop/sources/scripts/generator.js
+++ b/desktop/sources/scripts/generator.js
@@ -85,7 +85,6 @@ function Generator(layer,style)
       s += `${this.render(prev,seg,mirror)}`
       prev = seg.vertices ? seg.vertices[seg.vertices.length-1] : null
     }
-
     return s;
   }
 
diff --git a/desktop/sources/scripts/guide.js b/desktop/sources/scripts/guide.js
index db9c372..2d49254 100644
--- a/desktop/sources/scripts/guide.js
+++ b/desktop/sources/scripts/guide.js
@@ -85,7 +85,7 @@ function Guide()
   {
     if(!this.show_extras){ return; }
 
-    let cursor = {x:parseInt(dotgrid.cursor.pos.x/dotgrid.grid_width),y:parseInt(dotgrid.cursor.pos.y/dotgrid.grid_width)}
+    const cursor = {x:parseInt(dotgrid.cursor.pos.x/dotgrid.grid_width),y:parseInt(dotgrid.cursor.pos.y/dotgrid.grid_width)}
 
     for (let x = dotgrid.grid_x-1; x >= 0; x--) {
       for (let y = dotgrid.grid_y; y >= 0; y--) {
diff --git a/desktop/sources/scripts/interface.js b/desktop/sources/scripts/interface.js
index 5c2c235..7782cf2 100644
--- a/desktop/sources/scripts/interface.js
+++ b/desktop/sources/scripts/interface.js
@@ -47,9 +47,9 @@ function Interface()
     }
 
     for(const type in options){
-      let tools = options[type];
+      const tools = options[type];
       for(const name in tools){
-        let tool = tools[name];
+        const tool = tools[name];
         html += `
         <svg 
           id="option_${name}" 
@@ -106,7 +106,7 @@ function Interface()
 
     let multi_vertices = null;
     let segments = dotgrid.tool.layer()
-    let sum_segments = dotgrid.tool.length();
+    const sum_segments = dotgrid.tool.length();
 
     for(const i in segments){
       if(segments[i].vertices.length > 2){ multi_vertices = true; break; }
diff --git a/desktop/sources/scripts/lib/theme.js b/desktop/sources/scripts/lib/theme.js
index 0999b50..01aafe3 100644
--- a/desktop/sources/scripts/lib/theme.js
+++ b/desktop/sources/scripts/lib/theme.js
@@ -2,7 +2,7 @@
 
 function Theme(default_theme = {background: "#222", f_high: "#fff", f_med: "#ccc", f_low: "#999", f_inv: "#fff", b_high: "#888", b_med: "#666", b_low: "#444", b_inv: "#000" })
 {
-  let themer = this;
+  const themer = this;
 
   this.el = document.createElement("style")
   this.el.type = 'text/css'
@@ -26,7 +26,7 @@ function Theme(default_theme = {background: "#222", f_high: "#fff", f_med: "#ccc
   this.start = function()
   {
     console.log("Theme","Starting..")
-    let storage = is_json(localStorage.theme) ? JSON.parse(localStorage.theme) : this.collection.default;
+    const storage = is_json(localStorage.theme) ? JSON.parse(localStorage.theme) : this.collection.default;
     this.load(!storage.background ? this.collection.default : storage)
   }
 
@@ -67,8 +67,6 @@ function Theme(default_theme = {background: "#222", f_high: "#fff", f_med: "#ccc
 
   this.parse = function(any)
   {
-    let theme;
-
     if(any && any.background){ return any; }
     else if(any && any.data){ return any.data; }
     else if(any && is_json(any)){ return JSON.parse(any); }
@@ -79,7 +77,7 @@ function Theme(default_theme = {background: "#222", f_high: "#fff", f_med: "#ccc
 
   this.extract = function(text)
   {
-    let svg = new DOMParser().parseFromString(text,"text/xml")
+    const svg = new DOMParser().parseFromString(text,"text/xml")
     
     try{
       return {
@@ -135,12 +133,12 @@ function Theme(default_theme = {background: "#222", f_high: "#fff", f_med: "#ccc
     e.preventDefault();
     e.stopPropagation();
 
-    let file = e.dataTransfer.files[0];
+    const file = e.dataTransfer.files[0];
 
     if(!file || !file.name){ console.warn("Theme","Unnamed file."); return; }
     if(file.name.indexOf(".thm") < 0 && file.name.indexOf(".svg") < 0){ console.warn("Theme","Skipped, not a theme"); return; }
 
-    let reader = new FileReader();
+    const reader = new FileReader();
     reader.onload = function(e){
       themer.load(themer.parse(e.target.result));
     };
diff --git a/desktop/sources/scripts/picker.js b/desktop/sources/scripts/picker.js
index 1140aec..638a23c 100644
--- a/desktop/sources/scripts/picker.js
+++ b/desktop/sources/scripts/picker.js
@@ -33,7 +33,7 @@ function Picker()
     if(!this.is_active){ return; }
     if(!is_color(this.input.value)){ return; }
 
-    let hex = `#${this.input.value}`;
+    const hex = `#${this.input.value}`;
 
     document.getElementById("option_color").children[0].style.fill = hex;
     document.getElementById("option_color").children[0].style.stroke = hex;
@@ -59,7 +59,7 @@ function Picker()
   {
     if(!is_color(this.input.value)){ return; }
 
-    let hex = `#${this.input.value}`;
+    const hex = `#${this.input.value}`;
 
     dotgrid.tool.style().color = hex;
     dotgrid.tool.style().fill = dotgrid.tool.style().fill != "none" ? hex : "none";
@@ -95,13 +95,13 @@ function Picker()
       return false
     }
 
-    let re = /[0-9A-Fa-f]/g;
+    const re = /[0-9A-Fa-f]/g;
     return re.test(val)
   }
 
   function is_color_char(val)
   {
-    let re = /[0-9A-Fa-f]/g;
+    const re = /[0-9A-Fa-f]/g;
     return re.test(val)
   }