diff --git a/bower.json b/bower.json
index 13957afe4b..d9fbcbff04 100644
--- a/bower.json
+++ b/bower.json
@@ -16,8 +16,7 @@
     "blueimp-load-image": "~1.13.0",
     "autosize": "~4.0.0",
     "webaudiorecorder": "https://github.com/higuma/web-audio-recorder-js.git",
-    "mp3lameencoder": "https://github.com/higuma/mp3-lame-encoder-js.git",
-    "filesize": "https://github.com/avoidwork/filesize.js.git"
+    "mp3lameencoder": "https://github.com/higuma/mp3-lame-encoder-js.git"
   },
   "devDependencies": {
     "mocha": "~2.0.1",
@@ -83,9 +82,6 @@
     ],
     "mp3lameencoder": [
       "lib/Mp3LameEncoder.js"
-    ],
-    "filesize": [
-      "lib/filesize.js"
     ]
   },
   "concat": {
@@ -102,8 +98,7 @@
       "moment",
       "intl-tel-input",
       "backbone.typeahead",
-      "autosize",
-      "filesize"
+      "autosize"
     ],
     "libtextsecure": [
       "long",
diff --git a/components/filesize/lib/filesize.js b/components/filesize/lib/filesize.js
deleted file mode 100644
index 2d2421ad3d..0000000000
--- a/components/filesize/lib/filesize.js
+++ /dev/null
@@ -1,167 +0,0 @@
-"use strict";
-
-/**
- * filesize
- *
- * @copyright 2017 Jason Mulligan <jason.mulligan@avoidwork.com>
- * @license BSD-3-Clause
- * @version 3.5.10
- */
-(function (global) {
-	var b = /^(b|B)$/,
-	    symbol = {
-		iec: {
-			bits: ["b", "Kib", "Mib", "Gib", "Tib", "Pib", "Eib", "Zib", "Yib"],
-			bytes: ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"]
-		},
-		jedec: {
-			bits: ["b", "Kb", "Mb", "Gb", "Tb", "Pb", "Eb", "Zb", "Yb"],
-			bytes: ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"]
-		}
-	},
-	    fullform = {
-		iec: ["", "kibi", "mebi", "gibi", "tebi", "pebi", "exbi", "zebi", "yobi"],
-		jedec: ["", "kilo", "mega", "giga", "tera", "peta", "exa", "zetta", "yotta"]
-	};
-
-	/**
-  * filesize
-  *
-  * @method filesize
-  * @param  {Mixed}   arg        String, Int or Float to transform
-  * @param  {Object}  descriptor [Optional] Flags
-  * @return {String}             Readable file size String
-  */
-	function filesize(arg) {
-		var descriptor = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
-
-		var result = [],
-		    val = 0,
-		    e = void 0,
-		    base = void 0,
-		    bits = void 0,
-		    ceil = void 0,
-		    full = void 0,
-		    fullforms = void 0,
-		    neg = void 0,
-		    num = void 0,
-		    output = void 0,
-		    round = void 0,
-		    unix = void 0,
-		    spacer = void 0,
-		    standard = void 0,
-		    symbols = void 0;
-
-		if (isNaN(arg)) {
-			throw new Error("Invalid arguments");
-		}
-
-		bits = descriptor.bits === true;
-		unix = descriptor.unix === true;
-		base = descriptor.base || 2;
-		round = descriptor.round !== undefined ? descriptor.round : unix ? 1 : 2;
-		spacer = descriptor.spacer !== undefined ? descriptor.spacer : unix ? "" : " ";
-		symbols = descriptor.symbols || descriptor.suffixes || {};
-		standard = base === 2 ? descriptor.standard || "jedec" : "jedec";
-		output = descriptor.output || "string";
-		full = descriptor.fullform === true;
-		fullforms = descriptor.fullforms instanceof Array ? descriptor.fullforms : [];
-		e = descriptor.exponent !== undefined ? descriptor.exponent : -1;
-		num = Number(arg);
-		neg = num < 0;
-		ceil = base > 2 ? 1000 : 1024;
-
-		// Flipping a negative number to determine the size
-		if (neg) {
-			num = -num;
-		}
-
-		// Determining the exponent
-		if (e === -1 || isNaN(e)) {
-			e = Math.floor(Math.log(num) / Math.log(ceil));
-
-			if (e < 0) {
-				e = 0;
-			}
-		}
-
-		// Exceeding supported length, time to reduce & multiply
-		if (e > 8) {
-			e = 8;
-		}
-
-		// Zero is now a special case because bytes divide by 1
-		if (num === 0) {
-			result[0] = 0;
-			result[1] = unix ? "" : symbol[standard][bits ? "bits" : "bytes"][e];
-		} else {
-			val = num / (base === 2 ? Math.pow(2, e * 10) : Math.pow(1000, e));
-
-			if (bits) {
-				val = val * 8;
-
-				if (val >= ceil && e < 8) {
-					val = val / ceil;
-					e++;
-				}
-			}
-
-			result[0] = Number(val.toFixed(e > 0 ? round : 0));
-			result[1] = base === 10 && e === 1 ? bits ? "kb" : "kB" : symbol[standard][bits ? "bits" : "bytes"][e];
-
-			if (unix) {
-				result[1] = standard === "jedec" ? result[1].charAt(0) : e > 0 ? result[1].replace(/B$/, "") : result[1];
-
-				if (b.test(result[1])) {
-					result[0] = Math.floor(result[0]);
-					result[1] = "";
-				}
-			}
-		}
-
-		// Decorating a 'diff'
-		if (neg) {
-			result[0] = -result[0];
-		}
-
-		// Applying custom symbol
-		result[1] = symbols[result[1]] || result[1];
-
-		// Returning Array, Object, or String (default)
-		if (output === "array") {
-			return result;
-		}
-
-		if (output === "exponent") {
-			return e;
-		}
-
-		if (output === "object") {
-			return { value: result[0], suffix: result[1], symbol: result[1] };
-		}
-
-		if (full) {
-			result[1] = fullforms[e] ? fullforms[e] : fullform[standard][e] + (bits ? "bit" : "byte") + (result[0] === 1 ? "" : "s");
-		}
-
-		return result.join(spacer);
-	}
-
-	// Partial application for functional programming
-	filesize.partial = function (opt) {
-		return function (arg) {
-			return filesize(arg, opt);
-		};
-	};
-
-	// CommonJS, AMD, script tag
-	if (typeof exports !== "undefined") {
-		module.exports = filesize;
-	} else if (typeof define === "function" && define.amd) {
-		define(function () {
-			return filesize;
-		});
-	} else {
-		global.filesize = filesize;
-	}
-})(typeof window !== "undefined" ? window : global);
diff --git a/js/views/attachment_view.js b/js/views/attachment_view.js
index 1fe54e5232..0ac5a5e7f2 100644
--- a/js/views/attachment_view.js
+++ b/js/views/attachment_view.js
@@ -1,6 +1,7 @@
 /* global $: false */
 /* global _: false */
 /* global Backbone: false */
+/* global filesize: false */
 /* global moment: false */
 
 /* global i18n: false */
@@ -244,7 +245,7 @@
         model: {
           mediaType: this.mediaType(),
           fileName: this.displayName(),
-          fileSize: window.filesize(this.model.size),
+          fileSize: filesize(this.model.size),
           altText: i18n('clickToSave'),
         },
       });
diff --git a/preload.js b/preload.js
index aa19f884f7..ad3a0687a0 100644
--- a/preload.js
+++ b/preload.js
@@ -99,6 +99,7 @@ window.dataURLToBlobSync = require('blueimp-canvas-to-blob');
 window.EmojiConvertor = require('emoji-js');
 window.emojiData = require('emoji-datasource');
 window.EmojiPanel = require('emoji-panel');
+window.filesize = require('filesize');
 window.libphonenumber = require('google-libphonenumber').PhoneNumberUtil.getInstance();
 window.libphonenumber.PhoneNumberFormat =
   require('google-libphonenumber').PhoneNumberFormat;