diff --git a/frontend/src/download.js b/frontend/src/download.js
index a6d96449..de25bf14 100644
--- a/frontend/src/download.js
+++ b/frontend/src/download.js
@@ -1,5 +1,6 @@
 const FileReceiver = require('./fileReceiver');
 const { notify } = require('./utils');
+const bytes = require('bytes');
 const $ = require('jquery');
 require('jquery-circle-progress');
 
@@ -29,20 +30,7 @@ $(document).ready(function() {
       // update progress bar
       $('#dl-progress').circleProgress('value', percent);
       $('.percent-number').html(`${Math.floor(percent * 100)}`);
-      if (progress[1] < 1000000) {
-        $('.progress-text').html(
-          `${filename} (${(progress[0] / 1000).toFixed(1)}KB of
-           ${(progress[1] / 1000).toFixed(1)}KB)`
-        );
-      } else if (progress[1] < 1000000000) {
-        $('.progress-text').html(
-          `${filename} (${(progress[0] / 1000000).toFixed(1)}MB of ${(progress[1] / 1000000).toFixed(1)}MB)`
-        );
-      } else {
-        $('.progress-text').html(
-          `${filename} (${(progress[0] / 1000000).toFixed(1)}MB of ${(progress[1] / 1000000000).toFixed(1)}GB)`
-        );
-      }
+      $('.progress-text').text(`${filename} (${bytes(progress[0])} of ${bytes(progress[1])})`);
       //on complete
       if (percent === 1) {
         fileReceiver.removeAllListeners('progress');
diff --git a/frontend/src/fileSender.js b/frontend/src/fileSender.js
index a16b1849..97c76deb 100644
--- a/frontend/src/fileSender.js
+++ b/frontend/src/fileSender.js
@@ -118,14 +118,16 @@ class FileSender extends EventEmitter {
 
           xhr.onreadystatechange = () => {
             if (xhr.readyState === XMLHttpRequest.DONE) {
-              // uuid field and url field
-              const responseObj = JSON.parse(xhr.responseText);
-              resolve({
-                url: responseObj.url,
-                fileId: responseObj.id,
-                secretKey: keydata.k,
-                deleteToken: responseObj.delete
-              });
+              if (xhr.status === 200) {
+                const responseObj = JSON.parse(xhr.responseText);
+                return resolve({
+                  url: responseObj.url,
+                  fileId: responseObj.id,
+                  secretKey: keydata.k,
+                  deleteToken: responseObj.delete
+                });
+              }
+              reject(xhr.status);
             }
           };
 
diff --git a/frontend/src/upload.js b/frontend/src/upload.js
index 194d50af..af2b0ee2 100644
--- a/frontend/src/upload.js
+++ b/frontend/src/upload.js
@@ -1,5 +1,7 @@
+/* global MAXFILESIZE */
 const FileSender = require('./fileSender');
 const { notify, gcmCompliant } = require('./utils');
+const bytes = require('bytes');
 const $ = require('jquery');
 require('jquery-circle-progress');
 
@@ -84,6 +86,10 @@ $(document).ready(function() {
       file = event.target.files[0];
     }
 
+    if (file.size > MAXFILESIZE) {
+      return document.l10n.formatValue('fileTooBig', {size: bytes(MAXFILESIZE)}).then(alert);
+    }
+
     $('#page-one').attr('hidden', true);
     $('#upload-error').attr('hidden', true);
     $('#upload-progress').removeAttr('hidden');
@@ -108,19 +114,7 @@ $(document).ready(function() {
       $('#ul-progress').circleProgress().on('circle-animation-end', function() {
         $('.percent-number').html(`${Math.floor(percent * 100)}`);
       });
-      if (progress[1] < 1000000) {
-        $('.progress-text').text(
-          `${file.name} (${(progress[0] / 1000).toFixed(1)}KB of ${(progress[1] / 1000).toFixed(1)}KB)`
-        );
-      } else if (progress[1] < 1000000000) {
-        $('.progress-text').text(
-          `${file.name} (${(progress[0] / 1000000).toFixed(1)}MB of ${(progress[1] / 1000000).toFixed(1)}MB)`
-        );
-      } else {
-        $('.progress-text').text(
-          `${file.name} (${(progress[0] / 1000000).toFixed(1)}MB of ${(progress[1] / 1000000000).toFixed(1)}GB)`
-        );
-      }
+      $('.progress-text').text(`${file.name} (${bytes(progress[0])} of ${bytes(progress[1])})`);
     });
 
     fileSender.on('loading', isStillLoading => {
diff --git a/package-lock.json b/package-lock.json
index 8e2466bd..0d4784ed 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2,16 +2,11 @@
   "name": "firefox-send",
   "version": "0.1.2",
   "lockfileVersion": 1,
-  "requires": true,
   "dependencies": {
     "accepts": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.3.tgz",
-      "integrity": "sha1-w8p0NJOGSMPg2cHjKN1otiLChMo=",
-      "requires": {
-        "mime-types": "2.1.15",
-        "negotiator": "0.6.1"
-      }
+      "integrity": "sha1-w8p0NJOGSMPg2cHjKN1otiLChMo="
     },
     "acorn": {
       "version": "4.0.13",
@@ -24,9 +19,6 @@
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
       "dev": true,
-      "requires": {
-        "acorn": "3.3.0"
-      },
       "dependencies": {
         "acorn": {
           "version": "3.3.0",
@@ -46,19 +38,12 @@
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
       "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
       "dev": true,
-      "requires": {
-        "co": "4.6.0",
-        "json-stable-stringify": "1.0.1"
-      },
       "dependencies": {
         "json-stable-stringify": {
           "version": "1.0.1",
           "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
           "integrity": "sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=",
-          "dev": true,
-          "requires": {
-            "jsonify": "0.0.0"
-          }
+          "dev": true
         }
       }
     },
@@ -71,12 +56,7 @@
     "align-text": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
-      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
-      "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
-      }
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc="
     },
     "amdefine": {
       "version": "1.0.1",
@@ -103,29 +83,19 @@
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.0.tgz",
       "integrity": "sha1-o+Uvo5FoyCX/V7AkgSbOWo/5VQc=",
-      "dev": true,
-      "requires": {
-        "arrify": "1.0.1",
-        "micromatch": "2.3.11"
-      }
+      "dev": true
     },
     "argparse": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
       "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
-      "dev": true,
-      "requires": {
-        "sprintf-js": "1.0.3"
-      }
+      "dev": true
     },
     "arr-diff": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
       "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
-      "dev": true,
-      "requires": {
-        "arr-flatten": "1.0.3"
-      }
+      "dev": true
     },
     "arr-flatten": {
       "version": "1.0.3",
@@ -172,10 +142,7 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
-      "dev": true,
-      "requires": {
-        "array-uniq": "1.0.3"
-      }
+      "dev": true
     },
     "array-uniq": {
       "version": "1.0.3",
@@ -204,30 +171,19 @@
       "version": "4.9.1",
       "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.9.1.tgz",
       "integrity": "sha1-SLokC0WpKA6UdImQull9IWYX/UA=",
-      "dev": true,
-      "requires": {
-        "bn.js": "4.11.7",
-        "inherits": "2.0.3",
-        "minimalistic-assert": "1.0.0"
-      }
+      "dev": true
     },
     "assert": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/assert/-/assert-1.4.1.tgz",
       "integrity": "sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=",
-      "dev": true,
-      "requires": {
-        "util": "0.10.3"
-      }
+      "dev": true
     },
     "astw": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/astw/-/astw-2.2.0.tgz",
       "integrity": "sha1-e9QXhNMkk5h66yOba04cV6hzuRc=",
-      "dev": true,
-      "requires": {
-        "acorn": "4.0.13"
-      }
+      "dev": true
     },
     "async": {
       "version": "1.5.2",
@@ -249,42 +205,18 @@
       "version": "6.7.7",
       "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-6.7.7.tgz",
       "integrity": "sha1-Hb0cg1ZY41zj+ZhAmdsAWFx4IBQ=",
-      "dev": true,
-      "requires": {
-        "browserslist": "1.7.7",
-        "caniuse-db": "1.0.30000693",
-        "normalize-range": "0.1.2",
-        "num2fraction": "1.2.2",
-        "postcss": "5.2.17",
-        "postcss-value-parser": "3.3.0"
-      }
+      "dev": true
     },
     "aws-sdk": {
       "version": "2.77.0",
       "resolved": "https://registry.npmjs.org/aws-sdk/-/aws-sdk-2.77.0.tgz",
-      "integrity": "sha1-gJCQu4dNj0//ysUxZilYdjjnhlw=",
-      "requires": {
-        "buffer": "5.0.6",
-        "crypto-browserify": "1.0.9",
-        "jmespath": "0.15.0",
-        "querystring": "0.2.0",
-        "sax": "1.2.1",
-        "url": "0.10.3",
-        "uuid": "3.0.1",
-        "xml2js": "0.4.17",
-        "xmlbuilder": "4.2.1"
-      }
+      "integrity": "sha1-gJCQu4dNj0//ysUxZilYdjjnhlw="
     },
     "babel-code-frame": {
       "version": "6.22.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.22.0.tgz",
       "integrity": "sha1-AnYgvuVnqIwyVhV05/0IAdMxGOQ=",
-      "dev": true,
-      "requires": {
-        "chalk": "1.1.3",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.1"
-      }
+      "dev": true
     },
     "balanced-match": {
       "version": "1.0.0",
@@ -294,7 +226,7 @@
     "base64-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.2.1.tgz",
-      "integrity": "sha1-qRlH2h9KUW6jjltOwOw3c2deCIY="
+      "integrity": "sha512-dwVUVIXsBZXwTuwnXI9RK8sBmgq09NDHzyR9SAph9eqk76gKK2JSQmZARC2zRC81JC2QTtxD0ARU5qTS25gIGw=="
     },
     "binary-extensions": {
       "version": "1.8.0",
@@ -305,25 +237,13 @@
     "bn.js": {
       "version": "4.11.7",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.7.tgz",
-      "integrity": "sha1-3bBI5Q2UgnkAlME+s/z8gzznq0Y=",
+      "integrity": "sha512-LxFiV5mefv0ley0SzqkOPR1bC4EbpPx8LkOz5vMe/Yi15t5hzwgO/G+tc7wOtL4PZTYjwHu8JnEiSLumuSjSfA==",
       "dev": true
     },
     "body-parser": {
       "version": "1.17.2",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.17.2.tgz",
       "integrity": "sha1-+IkqvI+eYn1Crtr7yma/WrmRBO4=",
-      "requires": {
-        "bytes": "2.4.0",
-        "content-type": "1.0.2",
-        "debug": "2.6.7",
-        "depd": "1.1.0",
-        "http-errors": "1.6.1",
-        "iconv-lite": "0.4.15",
-        "on-finished": "2.3.0",
-        "qs": "6.4.0",
-        "raw-body": "2.2.0",
-        "type-is": "1.6.15"
-      },
       "dependencies": {
         "bytes": {
           "version": "2.4.0",
@@ -335,22 +255,13 @@
     "brace-expansion": {
       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
-      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
-      "requires": {
-        "balanced-match": "1.0.0",
-        "concat-map": "0.0.1"
-      }
+      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI="
     },
     "braces": {
       "version": "1.8.5",
       "resolved": "https://registry.npmjs.org/braces/-/braces-1.8.5.tgz",
       "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
-      "dev": true,
-      "requires": {
-        "expand-range": "1.8.2",
-        "preserve": "0.2.0",
-        "repeat-element": "1.1.2"
-      }
+      "dev": true
     },
     "brorand": {
       "version": "1.1.0",
@@ -362,23 +273,13 @@
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/browser-pack/-/browser-pack-6.0.2.tgz",
       "integrity": "sha1-+GzWzvT1MAyOY+B6TVEvZfv/RTE=",
-      "dev": true,
-      "requires": {
-        "combine-source-map": "0.7.2",
-        "defined": "1.0.0",
-        "JSONStream": "1.3.1",
-        "through2": "2.0.3",
-        "umd": "3.0.1"
-      }
+      "dev": true
     },
     "browser-resolve": {
       "version": "1.11.2",
       "resolved": "https://registry.npmjs.org/browser-resolve/-/browser-resolve-1.11.2.tgz",
       "integrity": "sha1-j/CbCixCFxihBRwmCzLkj0QpOM4=",
       "dev": true,
-      "requires": {
-        "resolve": "1.1.7"
-      },
       "dependencies": {
         "resolve": {
           "version": "1.1.7",
@@ -399,87 +300,18 @@
       "resolved": "https://registry.npmjs.org/browserify/-/browserify-14.4.0.tgz",
       "integrity": "sha1-CJo0Y69Y0OSNjNQHCz90ZU1avKk=",
       "dev": true,
-      "requires": {
-        "assert": "1.4.1",
-        "browser-pack": "6.0.2",
-        "browser-resolve": "1.11.2",
-        "browserify-zlib": "0.1.4",
-        "buffer": "5.0.6",
-        "cached-path-relative": "1.0.1",
-        "concat-stream": "1.5.2",
-        "console-browserify": "1.1.0",
-        "constants-browserify": "1.0.0",
-        "crypto-browserify": "3.11.0",
-        "defined": "1.0.0",
-        "deps-sort": "2.0.0",
-        "domain-browser": "1.1.7",
-        "duplexer2": "0.1.4",
-        "events": "1.1.1",
-        "glob": "7.1.2",
-        "has": "1.0.1",
-        "htmlescape": "1.1.1",
-        "https-browserify": "1.0.0",
-        "inherits": "2.0.3",
-        "insert-module-globals": "7.0.1",
-        "JSONStream": "1.3.1",
-        "labeled-stream-splicer": "2.0.0",
-        "module-deps": "4.1.1",
-        "os-browserify": "0.1.2",
-        "parents": "1.0.1",
-        "path-browserify": "0.0.0",
-        "process": "0.11.10",
-        "punycode": "1.3.2",
-        "querystring-es3": "0.2.1",
-        "read-only-stream": "2.0.0",
-        "readable-stream": "2.3.2",
-        "resolve": "1.3.3",
-        "shasum": "1.0.2",
-        "shell-quote": "1.6.1",
-        "stream-browserify": "2.0.1",
-        "stream-http": "2.7.2",
-        "string_decoder": "1.0.3",
-        "subarg": "1.0.0",
-        "syntax-error": "1.3.0",
-        "through2": "2.0.3",
-        "timers-browserify": "1.4.2",
-        "tty-browserify": "0.0.0",
-        "url": "0.11.0",
-        "util": "0.10.3",
-        "vm-browserify": "0.0.4",
-        "xtend": "4.0.1"
-      },
       "dependencies": {
         "crypto-browserify": {
           "version": "3.11.0",
           "resolved": "https://registry.npmjs.org/crypto-browserify/-/crypto-browserify-3.11.0.tgz",
           "integrity": "sha1-NlKgkGq5sqfgw85mpAjpV6JIVSI=",
-          "dev": true,
-          "requires": {
-            "browserify-cipher": "1.0.0",
-            "browserify-sign": "4.0.4",
-            "create-ecdh": "4.0.0",
-            "create-hash": "1.1.3",
-            "create-hmac": "1.1.6",
-            "diffie-hellman": "5.0.2",
-            "inherits": "2.0.3",
-            "pbkdf2": "3.0.12",
-            "public-encrypt": "4.0.0",
-            "randombytes": "2.0.5"
-          }
+          "dev": true
         },
         "glob": {
           "version": "7.1.2",
           "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-          "integrity": "sha1-wZyd+aAocC1nhhI4SmVSQExjbRU=",
-          "dev": true,
-          "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
-          }
+          "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
+          "dev": true
         },
         "isarray": {
           "version": "1.0.0",
@@ -491,35 +323,19 @@
           "version": "2.3.2",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.2.tgz",
           "integrity": "sha1-WgTfBeT1f+Pw3Gj90R3FyXx+b00=",
-          "dev": true,
-          "requires": {
-            "core-util-is": "1.0.2",
-            "inherits": "2.0.3",
-            "isarray": "1.0.0",
-            "process-nextick-args": "1.0.7",
-            "safe-buffer": "5.1.1",
-            "string_decoder": "1.0.3",
-            "util-deprecate": "1.0.2"
-          }
+          "dev": true
         },
         "string_decoder": {
           "version": "1.0.3",
           "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-          "integrity": "sha1-D8Z9fBQYJd6UKC3VNr7GubzoYKs=",
-          "dev": true,
-          "requires": {
-            "safe-buffer": "5.1.1"
-          }
+          "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+          "dev": true
         },
         "url": {
           "version": "0.11.0",
           "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
           "integrity": "sha1-ODjpfPxgUh63PFJajlW/3Z4uKPE=",
-          "dev": true,
-          "requires": {
-            "punycode": "1.3.2",
-            "querystring": "0.2.0"
-          }
+          "dev": true
         }
       }
     },
@@ -527,89 +343,48 @@
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.0.6.tgz",
       "integrity": "sha1-Xncl297x/Vkw1OurSFZ85FHEigo=",
-      "dev": true,
-      "requires": {
-        "buffer-xor": "1.0.3",
-        "cipher-base": "1.0.3",
-        "create-hash": "1.1.3",
-        "evp_bytestokey": "1.0.0",
-        "inherits": "2.0.3"
-      }
+      "dev": true
     },
     "browserify-cipher": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/browserify-cipher/-/browserify-cipher-1.0.0.tgz",
       "integrity": "sha1-mYgkSHS/XtTijalWZtzWasj8Njo=",
-      "dev": true,
-      "requires": {
-        "browserify-aes": "1.0.6",
-        "browserify-des": "1.0.0",
-        "evp_bytestokey": "1.0.0"
-      }
+      "dev": true
     },
     "browserify-des": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/browserify-des/-/browserify-des-1.0.0.tgz",
       "integrity": "sha1-2qJ3cXRwki7S/hhZQRihdUOXId0=",
-      "dev": true,
-      "requires": {
-        "cipher-base": "1.0.3",
-        "des.js": "1.0.0",
-        "inherits": "2.0.3"
-      }
+      "dev": true
     },
     "browserify-rsa": {
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-            "safe-buffer": "5.1.1"
-          }
+          "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ=="
         }
       }
     },
     "supertest": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/supertest/-/supertest-3.0.0.tgz",
-      "integrity": "sha1-jUu2j9GDDuBwM7HFpamkAhyWUpY=",
-      "requires": {
-        "methods": "1.1.2",
-        "superagent": "3.5.2"
-      }
+      "integrity": "sha1-jUu2j9GDDuBwM7HFpamkAhyWUpY="
     },
     "supports-color": {
       "version": "2.0.0",
@@ -6400,33 +4456,19 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/synesthesia/-/synesthesia-1.0.1.tgz",
       "integrity": "sha1-XvlepUjA1cbm+btLDQcx3/hkp3c=",
-      "dev": true,
-      "requires": {
-        "css-color-names": "0.0.3"
-      }
+      "dev": true
     },
     "syntax-error": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/syntax-error/-/syntax-error-1.3.0.tgz",
       "integrity": "sha1-HtkmbE1AvnXcVb+bsct3Biu5bKE=",
-      "dev": true,
-      "requires": {
-        "acorn": "4.0.13"
-      }
+      "dev": true
     },
     "table": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/table/-/table-4.0.1.tgz",
       "integrity": "sha1-qBFsEz+sLGH0pCCrbN9cTWHw5DU=",
-      "dev": true,
-      "requires": {
-        "ajv": "4.11.8",
-        "ajv-keywords": "1.5.1",
-        "chalk": "1.1.3",
-        "lodash": "4.17.4",
-        "slice-ansi": "0.0.4",
-        "string-width": "2.0.0"
-      }
+      "dev": true
     },
     "text-encoding": {
       "version": "0.6.4",
@@ -6451,10 +4493,6 @@
       "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.3.tgz",
       "integrity": "sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=",
       "dev": true,
-      "requires": {
-        "readable-stream": "2.3.2",
-        "xtend": "4.0.1"
-      },
       "dependencies": {
         "isarray": {
           "version": "1.0.0",
@@ -6466,25 +4504,13 @@
           "version": "2.3.2",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.2.tgz",
           "integrity": "sha1-WgTfBeT1f+Pw3Gj90R3FyXx+b00=",
-          "dev": true,
-          "requires": {
-            "core-util-is": "1.0.2",
-            "inherits": "2.0.3",
-            "isarray": "1.0.0",
-            "process-nextick-args": "1.0.7",
-            "safe-buffer": "5.1.1",
-            "string_decoder": "1.0.3",
-            "util-deprecate": "1.0.2"
-          }
+          "dev": true
         },
         "string_decoder": {
           "version": "1.0.3",
           "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-          "integrity": "sha1-D8Z9fBQYJd6UKC3VNr7GubzoYKs=",
-          "dev": true,
-          "requires": {
-            "safe-buffer": "5.1.1"
-          }
+          "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+          "dev": true
         }
       }
     },
@@ -6497,19 +4523,13 @@
       "version": "1.4.2",
       "resolved": "https://registry.npmjs.org/timers-browserify/-/timers-browserify-1.4.2.tgz",
       "integrity": "sha1-ycWLV1voQHN1y14kYtrO50NZ9B0=",
-      "dev": true,
-      "requires": {
-        "process": "0.11.10"
-      }
+      "dev": true
     },
     "tmp": {
       "version": "0.0.31",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.31.tgz",
       "integrity": "sha1-jzirlDjhcxXl29izZX6L+yd65Kc=",
-      "dev": true,
-      "requires": {
-        "os-tmpdir": "1.0.2"
-      }
+      "dev": true
     },
     "to-arraybuffer": {
       "version": "1.0.1",
@@ -6539,10 +4559,7 @@
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
-      "dev": true,
-      "requires": {
-        "prelude-ls": "1.1.2"
-      }
+      "dev": true
     },
     "type-detect": {
       "version": "4.0.3",
@@ -6553,11 +4570,7 @@
     "type-is": {
       "version": "1.6.15",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.15.tgz",
-      "integrity": "sha1-yrEPtJCeRByChC6v4a1kbIGARBA=",
-      "requires": {
-        "media-typer": "0.3.0",
-        "mime-types": "2.1.15"
-      }
+      "integrity": "sha1-yrEPtJCeRByChC6v4a1kbIGARBA="
     },
     "typedarray": {
       "version": "0.0.6",
@@ -6568,11 +4581,7 @@
     "uglify-es": {
       "version": "3.0.19",
       "resolved": "https://registry.npmjs.org/uglify-es/-/uglify-es-3.0.19.tgz",
-      "integrity": "sha1-U9RI3fWXcMHq++LiV6J+L0hR0OU=",
-      "requires": {
-        "commander": "2.9.0",
-        "source-map": "0.5.6"
-      },
+      "integrity": "sha512-d6ed8hkMCAIWdC+Nl3ihQo/eiX8cMNTbUAC2AEF0vlLTHIR3yAY6tdDoRRL4GuZ/jWQ7JVPK+uSp5XWRL3AVcw==",
       "dependencies": {
         "source-map": {
           "version": "0.5.6",
@@ -6607,11 +4616,7 @@
     "url": {
       "version": "0.10.3",
       "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
-      "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ=",
-      "requires": {
-        "punycode": "1.3.2",
-        "querystring": "0.2.0"
-      }
+      "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ="
     },
     "utcstring": {
       "version": "0.1.0",
@@ -6623,9 +4628,6 @@
       "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
       "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
       "dev": true,
-      "requires": {
-        "inherits": "2.0.1"
-      },
       "dependencies": {
         "inherits": {
           "version": "2.0.1",
@@ -6654,11 +4656,7 @@
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
       "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
-      "dev": true,
-      "requires": {
-        "spdx-correct": "1.0.2",
-        "spdx-expression-parse": "1.0.4"
-      }
+      "dev": true
     },
     "vary": {
       "version": "1.1.1",
@@ -6669,33 +4667,18 @@
       "version": "0.0.4",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
       "integrity": "sha1-XX6kW7755Kb/ZflUOOCofDV9WnM=",
-      "dev": true,
-      "requires": {
-        "indexof": "0.0.1"
-      }
+      "dev": true
     },
     "watchify": {
       "version": "3.9.0",
       "resolved": "https://registry.npmjs.org/watchify/-/watchify-3.9.0.tgz",
       "integrity": "sha1-8HX9LoqGrN6Eztum5cKgvt1SPZ4=",
-      "dev": true,
-      "requires": {
-        "anymatch": "1.3.0",
-        "browserify": "14.4.0",
-        "chokidar": "1.7.0",
-        "defined": "1.0.0",
-        "outpipe": "1.1.1",
-        "through2": "2.0.3",
-        "xtend": "4.0.1"
-      }
+      "dev": true
     },
     "which": {
       "version": "1.2.14",
       "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
-      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
-      "requires": {
-        "isexe": "2.0.0"
-      }
+      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU="
     },
     "window-size": {
       "version": "0.1.0",
@@ -6716,10 +4699,7 @@
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
-      "dev": true,
-      "requires": {
-        "mkdirp": "0.5.1"
-      }
+      "dev": true
     },
     "write-file-stdout": {
       "version": "0.0.2",
@@ -6735,19 +4715,12 @@
     "xml2js": {
       "version": "0.4.17",
       "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.17.tgz",
-      "integrity": "sha1-F76T6q4/O3eTWceVtBlwWogX6Gg=",
-      "requires": {
-        "sax": "1.2.1",
-        "xmlbuilder": "4.2.1"
-      }
+      "integrity": "sha1-F76T6q4/O3eTWceVtBlwWogX6Gg="
     },
     "xmlbuilder": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-4.2.1.tgz",
-      "integrity": "sha1-qlijBBoGb5DqoWwvU4n/GfP0YaU=",
-      "requires": {
-        "lodash": "4.17.4"
-      }
+      "integrity": "sha1-qlijBBoGb5DqoWwvU4n/GfP0YaU="
     },
     "xtend": {
       "version": "4.0.1",
@@ -6763,13 +4736,7 @@
     "yargs": {
       "version": "3.10.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
-      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
-      "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
-        "window-size": "0.1.0"
-      }
+      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E="
     }
   }
 }
diff --git a/public/locales/send.en-US.ftl b/public/locales/send.en-US.ftl
index a3873fbb..e249f5d1 100644
--- a/public/locales/send.en-US.ftl
+++ b/public/locales/send.en-US.ftl
@@ -63,6 +63,7 @@ errorPageHeader = Something went wrong!
 errorPageMessage = There has been an error uploading the file.
 errorPageLink = Send another file
 
+fileTooBig = That file is too big to upload. It should be less than { $size }.
 
 linkExpiredAlt.alt = Link expired
 expiredPageHeader = This link has expired or never existed in the first place!
diff --git a/server/config.js b/server/config.js
index b038869e..e937d1e9 100644
--- a/server/config.js
+++ b/server/config.js
@@ -36,6 +36,11 @@ const conf = convict({
     format: ['production', 'development', 'test'],
     default: 'development',
     env: 'NODE_ENV'
+  },
+  max_file_size: {
+    format: Number,
+    default: (1024 * 1024 * 1024) * 2,
+    env: 'P2P_MAX_FILE_SIZE'
   }
 });
 
diff --git a/server/server.js b/server/server.js
index 24e1d418..6d0039a0 100644
--- a/server/server.js
+++ b/server/server.js
@@ -62,7 +62,11 @@ app.use(
     }
   })
 );
-app.use(busboy());
+app.use(busboy({
+  limits: {
+    fileSize: conf.max_file_size
+  }
+}));
 app.use(bodyParser.json());
 app.use(express.static(STATIC_PATH));
 app.use('/l20n', express.static(L20N));
@@ -77,6 +81,7 @@ app.get('/jsconfig.js', (req, res) => {
   res.render('jsconfig', {
     trackerId: conf.analytics_id,
     dsn: conf.sentry_id,
+    maxFileSize: conf.max_file_size,
     layout: false
   });
 });
@@ -227,6 +232,12 @@ app.post('/upload', (req, res, next) => {
         delete: meta.delete,
         id: newId
       });
+    },
+    err => {
+      if (err.message === 'limit') {
+        return res.sendStatus(413);
+      }
+      res.sendStatus(500);
     });
   });
 
diff --git a/server/storage.js b/server/storage.js
index 68375e47..6e101d78 100644
--- a/server/storage.js
+++ b/server/storage.js
@@ -129,20 +129,24 @@ function localGet(id) {
 
 function localSet(newId, file, filename, meta) {
   return new Promise((resolve, reject) => {
-    const fstream = fs.createWriteStream(
-      path.join(__dirname, '../static', newId)
-    );
+    const filepath = path.join(__dirname, '../static', newId);
+    const fstream = fs.createWriteStream(filepath);
     file.pipe(fstream);
-    fstream.on('close', () => {
+    file.on('limit', () => {
+      file.unpipe(fstream);
+      fstream.destroy(new Error('limit'));
+    });
+    fstream.on('finish', () => {
       redis_client.hmset(newId, meta);
       redis_client.expire(newId, 86400000);
       log.info('localSet:', 'Upload Finished of ' + newId);
       resolve(meta.delete);
     });
 
-    fstream.on('error', () => {
+    fstream.on('error', err => {
       log.error('localSet:', 'Failed upload of ' + newId);
-      reject();
+      fs.unlinkSync(filepath);
+      reject(err);
     });
   });
 }
@@ -211,21 +215,25 @@ function awsSet(newId, file, filename, meta) {
     Key: newId,
     Body: file
   };
-
-  return new Promise((resolve, reject) => {
-    s3.upload(params, function(err, _data) {
-      if (err) {
-        log.info('awsUploadError:', err.stack); // an error occurred
-        reject();
+  let hitLimit = false;
+  const upload = s3.upload(params);
+  file.on('limit', () => {
+    hitLimit = true;
+    upload.abort();
+  });
+  return upload.promise()
+    .then(() => {
+      redis_client.hmset(newId, meta);
+      redis_client.expire(newId, 86400000);
+      log.info('awsUploadFinish', 'Upload Finished of ' + filename);
+    },
+    err => {
+      if (hitLimit) {
+        throw new Error('limit');
       } else {
-        redis_client.hmset(newId, meta);
-
-        redis_client.expire(newId, 86400000);
-        log.info('awsUploadFinish', 'Upload Finished of ' + filename);
-        resolve(meta.delete);
+        throw err;
       }
     });
-  });
 }
 
 function awsDelete(id, delete_token) {
diff --git a/test/unit/aws.storage.test.js b/test/unit/aws.storage.test.js
index 0a1778bf..e7449d75 100644
--- a/test/unit/aws.storage.test.js
+++ b/test/unit/aws.storage.test.js
@@ -110,9 +110,9 @@ describe('Testing Set using aws', function() {
   it('Should pass when the file is successfully uploaded', function() {
     const buf = Buffer.alloc(10);
     sinon.stub(crypto, 'randomBytes').returns(buf);
-    s3Stub.upload.callsArgWith(1, null, {});
+    s3Stub.upload.returns({promise: () => Promise.resolve()});
     return storage
-      .set('123', {}, 'Filename.moz', {})
+      .set('123', {on: sinon.stub()}, 'Filename.moz', {})
       .then(() => {
         assert(expire.calledOnce);
         assert(expire.calledWith('123', 86400000));
@@ -121,9 +121,9 @@ describe('Testing Set using aws', function() {
   });
 
   it('Should fail if there was an error during uploading', function() {
-    s3Stub.upload.callsArgWith(1, new Error(), null);
+    s3Stub.upload.returns({promise: () => Promise.reject()});
     return storage
-      .set('123', {}, 'Filename.moz', 'url.com')
+      .set('123', {on: sinon.stub()}, 'Filename.moz', 'url.com')
       .then(_reply => assert.fail())
       .catch(err => assert(1));
   });
diff --git a/test/unit/local.storage.test.js b/test/unit/local.storage.test.js
index d50fb478..48836433 100644
--- a/test/unit/local.storage.test.js
+++ b/test/unit/local.storage.test.js
@@ -117,12 +117,12 @@ describe('Testing Get from local filesystem', function() {
 describe('Testing Set to local filesystem', function() {
   it('Successfully writes the file to the local filesystem', function() {
     const stub = sinon.stub();
-    stub.withArgs('close', sinon.match.any).callsArgWithAsync(1);
+    stub.withArgs('finish', sinon.match.any).callsArgWithAsync(1);
     stub.withArgs('error', sinon.match.any).returns(1);
     fsStub.createWriteStream.returns({ on: stub });
 
     return storage
-      .set('test', { pipe: sinon.stub() }, 'Filename.moz', {})
+      .set('test', { pipe: sinon.stub(), on: sinon.stub() }, 'Filename.moz', {})
       .then(() => {
         assert(1);
       })
diff --git a/views/jsconfig.handlebars b/views/jsconfig.handlebars
index 1e960e83..4ff25330 100644
--- a/views/jsconfig.handlebars
+++ b/views/jsconfig.handlebars
@@ -4,3 +4,4 @@ window.dsn = '{{{dsn}}}';
 {{#if trackerId}}
 window.trackerId = '{{{trackerId}}}';
 {{/if}}
+const MAXFILESIZE = {{{maxFileSize}}};