diff --git a/README.md b/README.md
index bad97a1..5d71d1d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 canvas-text-wrapper
 =================
-v0.6.6
+##v0.6.7
 
 
 ## Syntax
diff --git a/bower.json b/bower.json
index ac97db7..39968bf 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "canvas-text-wrapper",
-  "version": "0.6.6",
+  "version": "0.6.7",
   "ignore": [
     "**/.*",
     "**/*.log",
diff --git a/canvas-text-wrapper.js b/canvas-text-wrapper.js
index a1c800a..65a8200 100644
--- a/canvas-text-wrapper.js
+++ b/canvas-text-wrapper.js
@@ -1,6 +1,6 @@
 /*! canvas-text-wrapper
  *  https://github.com/namniak/canvas-text-wrapper
- *  Version:  0.6.6
+ *  Version:  0.6.7
  *  MIT License (http://www.opensource.org/licenses/mit-license.html)
  */
 
@@ -37,7 +37,9 @@
     context.textBaseline = 'bottom';
 
     var scale = 1;
-    if (opts.renderHDPI && global.devicePixelRatio) {
+    var devicePixelRatio = (typeof global !== 'undefined') ? global.devicePixelRatio : root.devicePixelRatio;
+
+    if (opts.renderHDPI && devicePixelRatio > 1) {
       var tempCtx = {};
 
       // store context settings in a temp object before scaling otherwise they will be lost
@@ -47,7 +49,7 @@
 
       var canvasWidth = canvas.width;
       var canvasHeight = canvas.height;
-      scale = global.devicePixelRatio;
+      scale = devicePixelRatio;
 
       canvas.width = canvasWidth * scale;
       canvas.height = canvasHeight * scale;
diff --git a/canvas-text-wrapper.min.js b/canvas-text-wrapper.min.js
index 2070fd2..ded4103 100644
--- a/canvas-text-wrapper.min.js
+++ b/canvas-text-wrapper.min.js
@@ -1,6 +1,6 @@
 /*! canvas-text-wrapper
  *  https://github.com/namniak/canvas-text-wrapper
- *  Version:  0.6.6
+ *  Version:  0.6.7
  *  MIT License (http://www.opensource.org/licenses/mit-license.html)
  */
-!function(a){function b(a,b,c){"use strict";function d(a){y||(y=q.sizeToFill?s.font.split(/\b\d+px\b/i):q.font.split(/\b\d+px\b/i)),s.font=y[0]+a+"px"+y[1]}function e(){isNaN(q.lineHeight)?-1!==q.lineHeight.toString().indexOf("px")?I=parseInt(q.lineHeight):-1!==q.lineHeight.toString().indexOf("%")&&(I=parseInt(q.lineHeight)/100*D):I=D*q.lineHeight}function f(){if(q.sizeToFill){var a=b.trim().split(/\s+/).length,c=0;do g(++c);while(C>E&&F.join(" ").split(/\s+/).length==a);g(--c)}else h();q.justifyLines&&"auto"===q.lineBreak&&k(),n(),l()}function g(a){d(a),I=a,h()}function h(){if(q.allowNewLine)for(var a=b.trim().split("\n"),c=0,d=0;c<a.length-1;c++)d+=a[c].trim().split(/\s+/).length,G.push(d);var e=b.trim().split(/\s+/);i(e),j(e),E=F.length*I}function i(a){var b,c,d,e;a.forEach(function(f,g){if(b="",c=s.measureText(f).width,c>B){for(var h=0;s.measureText(b+f[h]).width<=B&&h<f.length;h++)b+=f[h];d=f.slice(0,h),e=f.slice(h),a.splice(g,1,d,e)}})}function j(a){for(var b=0,c=0;b<a.length;c++)if(F[c]="","auto"===q.lineBreak){for(;s.measureText(F[c]+a[b]).width<=B&&b<a.length;)if(F[c]+=a[b]+" ",b++,q.allowNewLine)for(var d=0;d<G.length;d++)if(G[d]===b){c++,F[c]="";break}F[c]=F[c].trim()}else F[c]=a[b],b++}function k(){for(var a,b,c,d=0;d<F.length;d++)c=s.measureText(F[d]).width,(!a||c>a)&&(a=c,b=d);var e,f,g,h,i,j=" ";for(d=0;d<F.length;d++)if(d!==b&&(e=F[d].trim().split(/\s+/).length,!(1>=e))){F[d]=F[d].trim().split(/\s+/).join(j),f=s.measureText(j).width,g=(a-s.measureText(F[d]).width)/f,h=g/(e-1),i="";for(var k=0;h>k;k++)i+=j;F[d]=F[d].trim().split(j).join(i)}}function l(){for(var a=0;a<F.length;a++)m(F[a]),H.y=parseInt(H.y)+I,s.fillText(F[a],H.x,H.y),q.strokeText&&s.strokeText(F[a],H.x,H.y)}function m(a){"center"==q.textAlign?H.x=(z-s.measureText(a).width)/2:"right"==q.textAlign?H.x=z-s.measureText(a).width-q.paddingX:H.x=q.paddingX}function n(){"middle"==q.verticalAlign?H.y=(A-E)/2:"bottom"==q.verticalAlign?H.y=A-E-q.paddingY:H.y=q.paddingY}function o(){if("string"!=typeof b)throw new TypeError("The second parameter must be a String.");if(isNaN(D))throw new TypeError('Cannot parse "font".');if(isNaN(I))throw new TypeError('Cannot parse "lineHeight".');if("left"!==q.textAlign.toLocaleLowerCase()&&"center"!==q.textAlign.toLocaleLowerCase()&&"right"!==q.textAlign.toLocaleLowerCase())throw new TypeError('Property "textAlign" must be set to either "left", "center", or "right".');if("top"!==q.verticalAlign.toLocaleLowerCase()&&"middle"!==q.verticalAlign.toLocaleLowerCase()&&"bottom"!==q.verticalAlign.toLocaleLowerCase())throw new TypeError('Property "verticalAlign" must be set to either "top", "middle", or "bottom".');if("boolean"!=typeof q.justifyLines)throw new TypeError('Property "justifyLines" must be a Boolean.');if(isNaN(q.paddingX))throw new TypeError('Property "paddingX" must be a Number.');if(isNaN(q.paddingY))throw new TypeError('Property "paddingY" must be a Number.');if("boolean"!=typeof q.fitParent)throw new TypeError('Property "fitParent" must be a Boolean.');if("auto"!==q.lineBreak.toLocaleLowerCase()&&"word"!==q.lineBreak.toLocaleLowerCase())throw new TypeError('Property "lineBreak" must be set to either "auto" or "word".');if("boolean"!=typeof q.sizeToFill)throw new TypeError('Property "sizeToFill" must be a Boolean.');if("boolean"!=typeof q.strokeText)throw new TypeError('Property "strokeText" must be a Boolean.');if("boolean"!=typeof q.renderHDPI)throw new TypeError('Property "renderHDPI" must be a Boolean.')}var p={font:"18px Arial, sans-serif",sizeToFill:!1,lineHeight:1,allowNewLine:!0,lineBreak:"auto",textAlign:"left",verticalAlign:"top",justifyLines:!1,paddingX:0,paddingY:0,fitParent:!1,strokeText:!1,renderHDPI:!0},q={};for(var r in p)q[r]=c.hasOwnProperty(r)?c[r]:p[r];var s=a.getContext("2d");s.font=q.font,s.textBaseline="bottom";var t=1;if(q.renderHDPI&&global.devicePixelRatio){var u={};for(var r in s)u[r]=s[r];var v=a.width,w=a.height;t=global.devicePixelRatio,a.width=v*t,a.height=w*t,a.style.width=v*t*.5+"px",a.style.height=w*t*.5+"px";for(var r in u)try{s[r]=u[r]}catch(x){}s.scale(t,t)}var y,z=(q.fitParent?a.parentNode.clientWidth:a.width)/t,A=(q.fitParent?a.parentNode.clientHeight:a.height)/t,B=z-2*q.paddingX,C=A-2*q.paddingY,D=q.font.match(/\d+(px|em|%)/g)?+q.font.match(/\d+(px|em|%)/g)[0].match(/\d+/g):18,E=0,F=[],G=[],H={x:0,y:0},I=0;d(D),e(),o(),f()}"module"in a&&"exports"in module?module.exports=b:a.CanvasTextWrapper=b}(this);
\ No newline at end of file
+!function(a){function b(b,c,d){"use strict";function e(a){A||(A=r.sizeToFill?t.font.split(/\b\d+px\b/i):r.font.split(/\b\d+px\b/i)),t.font=A[0]+a+"px"+A[1]}function f(){isNaN(r.lineHeight)?-1!==r.lineHeight.toString().indexOf("px")?K=parseInt(r.lineHeight):-1!==r.lineHeight.toString().indexOf("%")&&(K=parseInt(r.lineHeight)/100*F):K=F*r.lineHeight}function g(){if(r.sizeToFill){var a=c.trim().split(/\s+/).length,b=0;do h(++b);while(E>G&&H.join(" ").split(/\s+/).length==a);h(--b)}else i();r.justifyLines&&"auto"===r.lineBreak&&l(),o(),m()}function h(a){e(a),K=a,i()}function i(){if(r.allowNewLine)for(var a=c.trim().split("\n"),b=0,d=0;b<a.length-1;b++)d+=a[b].trim().split(/\s+/).length,I.push(d);var e=c.trim().split(/\s+/);j(e),k(e),G=H.length*K}function j(a){var b,c,d,e;a.forEach(function(f,g){if(b="",c=t.measureText(f).width,c>D){for(var h=0;t.measureText(b+f[h]).width<=D&&h<f.length;h++)b+=f[h];d=f.slice(0,h),e=f.slice(h),a.splice(g,1,d,e)}})}function k(a){for(var b=0,c=0;b<a.length;c++)if(H[c]="","auto"===r.lineBreak){for(;t.measureText(H[c]+a[b]).width<=D&&b<a.length;)if(H[c]+=a[b]+" ",b++,r.allowNewLine)for(var d=0;d<I.length;d++)if(I[d]===b){c++,H[c]="";break}H[c]=H[c].trim()}else H[c]=a[b],b++}function l(){for(var a,b,c,d=0;d<H.length;d++)c=t.measureText(H[d]).width,(!a||c>a)&&(a=c,b=d);var e,f,g,h,i,j=" ";for(d=0;d<H.length;d++)if(d!==b&&(e=H[d].trim().split(/\s+/).length,!(1>=e))){H[d]=H[d].trim().split(/\s+/).join(j),f=t.measureText(j).width,g=(a-t.measureText(H[d]).width)/f,h=g/(e-1),i="";for(var k=0;h>k;k++)i+=j;H[d]=H[d].trim().split(j).join(i)}}function m(){for(var a=0;a<H.length;a++)n(H[a]),J.y=parseInt(J.y)+K,t.fillText(H[a],J.x,J.y),r.strokeText&&t.strokeText(H[a],J.x,J.y)}function n(a){"center"==r.textAlign?J.x=(B-t.measureText(a).width)/2:"right"==r.textAlign?J.x=B-t.measureText(a).width-r.paddingX:J.x=r.paddingX}function o(){"middle"==r.verticalAlign?J.y=(C-G)/2:"bottom"==r.verticalAlign?J.y=C-G-r.paddingY:J.y=r.paddingY}function p(){if("string"!=typeof c)throw new TypeError("The second parameter must be a String.");if(isNaN(F))throw new TypeError('Cannot parse "font".');if(isNaN(K))throw new TypeError('Cannot parse "lineHeight".');if("left"!==r.textAlign.toLocaleLowerCase()&&"center"!==r.textAlign.toLocaleLowerCase()&&"right"!==r.textAlign.toLocaleLowerCase())throw new TypeError('Property "textAlign" must be set to either "left", "center", or "right".');if("top"!==r.verticalAlign.toLocaleLowerCase()&&"middle"!==r.verticalAlign.toLocaleLowerCase()&&"bottom"!==r.verticalAlign.toLocaleLowerCase())throw new TypeError('Property "verticalAlign" must be set to either "top", "middle", or "bottom".');if("boolean"!=typeof r.justifyLines)throw new TypeError('Property "justifyLines" must be a Boolean.');if(isNaN(r.paddingX))throw new TypeError('Property "paddingX" must be a Number.');if(isNaN(r.paddingY))throw new TypeError('Property "paddingY" must be a Number.');if("boolean"!=typeof r.fitParent)throw new TypeError('Property "fitParent" must be a Boolean.');if("auto"!==r.lineBreak.toLocaleLowerCase()&&"word"!==r.lineBreak.toLocaleLowerCase())throw new TypeError('Property "lineBreak" must be set to either "auto" or "word".');if("boolean"!=typeof r.sizeToFill)throw new TypeError('Property "sizeToFill" must be a Boolean.');if("boolean"!=typeof r.strokeText)throw new TypeError('Property "strokeText" must be a Boolean.');if("boolean"!=typeof r.renderHDPI)throw new TypeError('Property "renderHDPI" must be a Boolean.')}var q={font:"18px Arial, sans-serif",sizeToFill:!1,lineHeight:1,allowNewLine:!0,lineBreak:"auto",textAlign:"left",verticalAlign:"top",justifyLines:!1,paddingX:0,paddingY:0,fitParent:!1,strokeText:!1,renderHDPI:!0},r={};for(var s in q)r[s]=d.hasOwnProperty(s)?d[s]:q[s];var t=b.getContext("2d");t.font=r.font,t.textBaseline="bottom";var u=1,v="undefined"!=typeof global?global.devicePixelRatio:a.devicePixelRatio;if(r.renderHDPI&&v>1){var w={};for(var s in t)w[s]=t[s];var x=b.width,y=b.height;u=v,b.width=x*u,b.height=y*u,b.style.width=x*u*.5+"px",b.style.height=y*u*.5+"px";for(var s in w)try{t[s]=w[s]}catch(z){}t.scale(u,u)}var A,B=(r.fitParent?b.parentNode.clientWidth:b.width)/u,C=(r.fitParent?b.parentNode.clientHeight:b.height)/u,D=B-2*r.paddingX,E=C-2*r.paddingY,F=r.font.match(/\d+(px|em|%)/g)?+r.font.match(/\d+(px|em|%)/g)[0].match(/\d+/g):18,G=0,H=[],I=[],J={x:0,y:0},K=0;e(F),f(),p(),g()}"module"in a&&"exports"in module?module.exports=b:a.CanvasTextWrapper=b}(this);
\ No newline at end of file
diff --git a/package.json b/package.json
index 73682da..789704e 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "canvas-text-wrapper",
   "description": "Split canvas text into lines on specified rule with optional alignment, padding, and more. Supports HDPI screens.",
-  "version": "0.6.6",
+  "version": "0.6.7",
   "license": "MIT",
   "main": "canvas-text-wrapper.min.js",
   "keywords": [
@@ -25,6 +25,7 @@
     "test": "beefy test/test.js --live --open"
   },
   "devDependencies": {
+    "grunt": "^0.4.5",
     "grunt-contrib-uglify": "^0.9.1",
     "uglify-save-license": "^0.4.1"
   }