diff --git a/.htmllintrc b/.htmllintrc
new file mode 100644
index 00000000..8a02bbec
--- /dev/null
+++ b/.htmllintrc
@@ -0,0 +1,5 @@
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+}
diff --git a/package-lock.json b/package-lock.json
index 5b91b3c2..19f83aec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -315,6 +315,12 @@
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@@ -908,12 +957,44 @@
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@@ -1541,11 +1778,37 @@
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+      "integrity": "sha1-E/FM4C7tTpgSl7ZOueO5MuLdE9w=",
+      "dev": true
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@@ -1808,6 +2107,12 @@
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+      "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
+      "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
+      "dev": true
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       "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
@@ -1820,17 +2125,65 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/liftoff/-/liftoff-2.3.0.tgz",
+      "integrity": "sha1-qY8v9nGD2Lp8+soQVIvX/wVQs4U=",
+      "dev": true
+    },
+    "load-json-file": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-1.1.0.tgz",
+      "integrity": "sha1-lWkFcI1YtLq0wiYbBPWfMcmTdMA=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
       "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4="
     },
+    "lodash.assignwith": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/lodash.assignwith/-/lodash.assignwith-4.2.0.tgz",
+      "integrity": "sha1-EnqX8CrcQXUalU0ksN4X4QDgOOs=",
+      "dev": true
+    },
+    "lodash.isempty": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/lodash.isempty/-/lodash.isempty-4.4.0.tgz",
+      "integrity": "sha1-b4bL7di+TsmHvpqvM8loTbGzHn4=",
+      "dev": true
+    },
+    "lodash.isplainobject": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/lodash.isplainobject/-/lodash.isplainobject-4.0.6.tgz",
+      "integrity": "sha1-fFJqUtibRcRcxpC4gWO+BJf1UMs=",
+      "dev": true
+    },
+    "lodash.isstring": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
+      "integrity": "sha1-1SfftUVuynzJu5XV2ur4i6VKVFE=",
+      "dev": true
+    },
+    "lodash.mapvalues": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/lodash.mapvalues/-/lodash.mapvalues-4.6.0.tgz",
+      "integrity": "sha1-G6+lAF3p3W9PJmaMMMo3IwzJaJw=",
+      "dev": true
+    },
     "lodash.memoize": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-3.0.4.tgz",
       "integrity": "sha1-LcvSwofLwKVcxCMovQxzYVDVPj8=",
       "dev": true
     },
+    "lodash.pick": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/lodash.pick/-/lodash.pick-4.4.0.tgz",
+      "integrity": "sha1-UvBWEP/53tQiYRRB7R/BI6AwAbM=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
@@ -1842,6 +2195,12 @@
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       "dev": true
     },
+    "map-cache": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/map-cache/-/map-cache-0.2.2.tgz",
+      "integrity": "sha1-wyq9C9ZSXZsFFkW7TyasXcmKDb8=",
+      "dev": true
+    },
     "media-typer": {
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       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -2005,6 +2364,12 @@
       "dev": true,
       "optional": true
     },
+    "normalize-package-data": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/normalize-package-data/-/normalize-package-data-2.3.8.tgz",
+      "integrity": "sha1-2Bntoqne29H/pWPqQHHZNngilbs=",
+      "dev": true
+    },
     "normalize-path": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
@@ -2107,6 +2472,12 @@
       "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
       "dev": true
     },
+    "os-locale": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
+      "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
+      "dev": true
+    },
     "os-tmpdir": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
@@ -2145,12 +2516,30 @@
       "integrity": "sha1-N8T5t+06tlx0gXtfJICTf7+XxxI=",
       "dev": true
     },
+    "parse-filepath": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parse-filepath/-/parse-filepath-1.0.1.tgz",
+      "integrity": "sha1-FZ1hVdQ5BNFsEO9piRHaHpGWm3M=",
+      "dev": true
+    },
     "parse-glob": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/parse-glob/-/parse-glob-3.0.4.tgz",
       "integrity": "sha1-ssN2z7EfNVE7rdFz7wu246OIORw=",
       "dev": true
     },
+    "parse-json": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/parse-json/-/parse-json-2.2.0.tgz",
+      "integrity": "sha1-9ID0BDTvgHQfhGkJn43qGPVaTck=",
+      "dev": true
+    },
+    "parse-passwd": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/parse-passwd/-/parse-passwd-1.0.0.tgz",
+      "integrity": "sha1-bVuTSkVpk7I9N/QKOC1vFmao5cY=",
+      "dev": true
+    },
     "parseurl": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.1.tgz",
@@ -2167,6 +2556,12 @@
       "integrity": "sha1-oLhwcpquIUAFt9UDLsLLuw+0RRo=",
       "dev": true
     },
+    "path-exists": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-2.1.0.tgz",
+      "integrity": "sha1-D+tsZPD8UY2adU3V77YscCJ2H0s=",
+      "dev": true
+    },
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -2190,11 +2585,29 @@
       "integrity": "sha1-6GQhf3TDaFDwhSt43Hv31KVyG/I=",
       "dev": true
     },
+    "path-root": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/path-root/-/path-root-0.1.1.tgz",
+      "integrity": "sha1-mkpoFMrBwM1zNgqV8yCDyOpHRbc=",
+      "dev": true
+    },
+    "path-root-regex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/path-root-regex/-/path-root-regex-0.1.2.tgz",
+      "integrity": "sha1-v8zcjfWxLcUsi0PsONGNcsBLqW0=",
+      "dev": true
+    },
     "path-to-regexp": {
       "version": "0.1.7",
       "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
       "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w="
     },
+    "path-type": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/path-type/-/path-type-1.1.0.tgz",
+      "integrity": "sha1-WcRPfuSR2nBNpBXaWkBwuk+P5EE=",
+      "dev": true
+    },
     "pbkdf2": {
       "version": "3.0.12",
       "resolved": "https://registry.npmjs.org/pbkdf2/-/pbkdf2-3.0.12.tgz",
@@ -2373,6 +2786,18 @@
         }
       }
     },
+    "read-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz",
+      "integrity": "sha1-9f+qXs0pyzHAR0vKfXVra7KePyg=",
+      "dev": true
+    },
+    "read-pkg-up": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-1.0.1.tgz",
+      "integrity": "sha1-nWPBMnbAZZGNV/ACpX9AobZD+wI=",
+      "dev": true
+    },
     "readable-stream": {
       "version": "1.1.14",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
@@ -2461,6 +2886,18 @@
       "dev": true,
       "optional": true
     },
+    "require-directory": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
+      "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I=",
+      "dev": true
+    },
+    "require-main-filename": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+      "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+      "dev": true
+    },
     "require-uncached": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
@@ -2473,6 +2910,12 @@
       "integrity": "sha1-ZVkHw0aahoDcLeOidaj91paR8OU=",
       "dev": true
     },
+    "resolve-dir": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/resolve-dir/-/resolve-dir-0.1.1.tgz",
+      "integrity": "sha1-shklmlYC+sXFxJatiUpujMQwJh4=",
+      "dev": true
+    },
     "resolve-from": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-1.0.1.tgz",
@@ -2558,8 +3001,7 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
       "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
-      "dev": true,
-      "optional": true
+      "dev": true
     },
     "set-immediate-shim": {
       "version": "1.0.1",
@@ -2608,6 +3050,12 @@
       "integrity": "sha1-3svPh0sNHl+3LhSxZKloMEjprLM=",
       "dev": true
     },
+    "sigmund": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/sigmund/-/sigmund-1.0.1.tgz",
+      "integrity": "sha1-P/IfGYytIXX587eBhT/ZTQ0ZtZA=",
+      "dev": true
+    },
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
@@ -2633,6 +3081,24 @@
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.6.tgz",
       "integrity": "sha1-dc449SvwczxafwwRjYEzSiu19BI="
     },
+    "spdx-correct": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-1.0.2.tgz",
+      "integrity": "sha1-SzBz2TP/UfORLwOsVRlJikFQ20A=",
+      "dev": true
+    },
+    "spdx-expression-parse": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-1.0.4.tgz",
+      "integrity": "sha1-m98vIOH0DtRH++JzJmGR/O1RYmw=",
+      "dev": true
+    },
+    "spdx-license-ids": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-1.2.2.tgz",
+      "integrity": "sha1-yd96NCRZSt5r0RkA1ZZpbcBrrFc=",
+      "dev": true
+    },
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -2803,9 +3269,9 @@
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8="
     },
     "strip-bom": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
-      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
+      "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
       "dev": true
     },
     "strip-json-comments": {
@@ -3017,6 +3483,12 @@
       "integrity": "sha1-iuVW4RAR9jwllnCKiDclnwGz1g4=",
       "dev": true
     },
+    "unc-path-regex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+      "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
+      "dev": true
+    },
     "universalify": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.0.tgz",
@@ -3080,6 +3552,12 @@
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.0.1.tgz",
       "integrity": "sha1-ZUS7ot/ajBzxfmKaOjBeK7H+5sE="
     },
+    "validate-npm-package-license": {
+      "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
+    },
     "vary": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.1.tgz",
@@ -3110,6 +3588,12 @@
       "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
       "dev": true
     },
+    "which-module": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
+      "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
+      "dev": true
+    },
     "wide-align": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
@@ -3128,6 +3612,12 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
       "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc="
     },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -3155,6 +3645,12 @@
       "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
       "dev": true
     },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
@@ -3166,6 +3662,20 @@
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
       "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
       "optional": true
+    },
+    "yargs-parser": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+      "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
+      "dev": true,
+      "dependencies": {
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+          "dev": true
+        }
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 91819e51..50f9cf7d 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,7 @@
     "eslint": "3.19.0",
     "eslint-plugin-node": "5.0.0",
     "eslint-plugin-security": "1.3.0",
+    "htmllint-cli": "0.0.6",
     "prettier": "1.4.4",
     "watchify": "^3.9.0"
   },
@@ -38,6 +39,7 @@
     "dev": "watchify frontend/src/main.js -o public/bundle.js -d | node server/portal_server.js",
     "format": "prettier 'frontend/src/*.js' 'server/*.js' 'public/*.css' --single-quote --write",
     "lint": "eslint .",
+    "lint:html": "htmllint 'views/*.handlebars'",
     "start": "watchify frontend/src/main.js -o public/bundle.js -d | cross-env NODE_ENV=production node server/portal_server.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   }
diff --git a/views/download.handlebars b/views/download.handlebars
index e1fa05d4..da97535f 100644
--- a/views/download.handlebars
+++ b/views/download.handlebars
@@ -13,13 +13,13 @@
     <div id="download">
       {{#if filename}}
       <div class="title">
-        Your friend is sending you a file: <br>
+        Your friend is sending you a file: <br />
         {{{filename}}} ({{{filesize}}})
       </div>
 
       <div class="share-window">
         <button id="download-btn" onclick="download()">Download File</button>
-        <img id="expired-img" src="/resources/link_expired.png"/>
+        <img id="expired-img" src="/resources/link_expired.png" alt="Link expired" />
       </div>
       <div class="send-new" id="send-file">
         Send your own files
@@ -30,11 +30,13 @@
       </div>
 
       <div class="share-window">
-        <img src="/resources/link_expired.png"/>
+        <img src="/resources/link_expired.png" alt="Link expired" />
       </div>
+      <!-- htmllint id-no-dup="false" -->
       <div class="send-new" id="send-file">
         Send your own files
       </div>
+      <!-- htmllint tag-bans="$previous" -->
       {{/if}}
     </div>
   </div>
diff --git a/views/index.handlebars b/views/index.handlebars
index 2cf237e5..9dd4a70f 100644
--- a/views/index.handlebars
+++ b/views/index.handlebars
@@ -15,7 +15,7 @@
         Share your files quickly, privately and securely.
       </div>
       <div class="upload-window" ondrop="onUpload(event)" ondragover="allowDrop(event)">
-        <div id="upload-img"><img src="/resources/upload.svg"/></div>
+        <div id="upload-img"><img src="/resources/upload.svg" alt="Upload"/></div>
         <div>
           DRAG &amp; DROP
         </div>
@@ -36,10 +36,12 @@
     <div id="file-list">
       <table id="uploaded-files">
         <tr>
-          <th width=30%>File</th>
-          <th width=45%>Copy URL</th>
-          <th width=18%>Expires in</th>
-          <th width=7%>Delete</th>
+          <!-- htmllint attr-bans="false" -->
+          <th width="30%">File</th>
+          <th width="45%">Copy URL</th>
+          <th width="18%">Expires in</th>
+          <th width="7%">Delete</th>
+          <!-- htmllint tag-bans="$previous" -->
         </tr>
       </table>
     </div>
@@ -49,7 +51,7 @@
         Uploading
       </div>
       <div class="upload-window">
-        <div id="upload-img"><img src="/resources/upload.svg"/></div>
+        <div id="upload-img"><img src="/resources/upload.svg" alt="Upload" /></div>
         <div class="upload">
           <!-- progress bar here -->
         </div>
@@ -61,7 +63,7 @@
         Copy the link below to share your file!
       </div>
       <div class="share-window">
-        <img src="/resources/share.png"/>
+        <img src="/resources/share.png" alt="Share" />
         <div id="share-window-r">
           <div id="copy">
             <input id="link" type="url" value="" readonly/>
@@ -76,7 +78,6 @@
         Send another file
       </div>
     </div>
-
   </div>
 
 </body>