diff --git a/config.example.js b/config.example.js
index 76bba6eae..1be17e510 100644
--- a/config.example.js
+++ b/config.example.js
@@ -116,6 +116,12 @@ module.exports = {
         'contact',
     ],
 
+    /*  Domain
+     *  If you want to have enable payments on your CryptPad instance, it has to be able to tell
+     *  our account server what is your domain
+     */
+    // domain: 'https://cryptpad.fr',
+
     /*
         You have the option of specifying an alternative storage adaptor.
         These status of these alternatives are specified in their READMEs,
diff --git a/package.json b/package.json
index 83653bd7b..75a4fbb11 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "cryptpad",
   "description": "realtime collaborative visual editor with zero knowlege server",
-  "version": "1.6.0",
+  "version": "1.8.0",
   "dependencies": {
     "chainpad-server": "^1.0.1",
     "express": "~4.10.1",
diff --git a/rpc.js b/rpc.js
index ec6e516d0..e729e4802 100644
--- a/rpc.js
+++ b/rpc.js
@@ -7,11 +7,14 @@ var Nacl = require("tweetnacl");
 
 var Fs = require("fs");
 var Path = require("path");
+var Https = require("https");
 
 var RPC = module.exports;
 
 var Store = require("./storage/file");
 
+var DEFAULT_LIMIT = 100;
+
 var isValidChannel = function (chan) {
     return /^[a-fA-F0-9]/.test(chan) ||
         [32, 48].indexOf(chan.length) !== -1;
@@ -454,8 +457,64 @@ var isPrivilegedUser = function (publicKey, cb) {
     });
 };
 
-var getLimit = function (cb) {
-    cb = cb; // TODO
+// The limits object contains storage limits for all the publicKey that have paid
+// To each key is associated an object containing the 'limit' value and a 'note' explaining that limit
+var limits = {};
+var updateLimits = function (config, publicKey, cb) {
+    if (typeof cb !== "function") { cb = function () {}; }
+
+    var body = JSON.stringify({
+        domain: config.domain,
+        subdomain: config.subdomain
+    });
+    var options = {
+        host: 'accounts.cryptpad.fr',
+        path: '/api/getauthorized',
+        method: 'POST',
+        headers: {
+            "Content-Type": "application/json",
+            "Content-Length": Buffer.byteLength(body)
+        }
+    };
+    var req = Https.request(options, function (response) {
+        if (!('' + req.statusCode).match(/^2\d\d$/)) {
+            return void cb('SERVER ERROR ' + req.statusCode);
+        }
+        var str = '';
+
+        response.on('data', function (chunk) {
+            str += chunk;
+        });
+
+        response.on('end', function () {
+            try {
+                var json = JSON.parse(str);
+                limits = json;
+                var l;
+                if (publicKey) {
+                    var limit = limits[publicKey];
+                    l = limit && typeof limit.limit === "number" ? limit.limit : DEFAULT_LIMIT;
+                }
+                cb(void 0, l);
+            } catch (e) {
+                cb(e);
+            }
+        });
+    });
+
+    req.on('error', function (e) {
+        if (!config.domain) { return cb(); }
+        cb(e);
+    });
+
+    req.end(body);
+};
+
+var getLimit = function (publicKey, cb) {
+    var limit = limits[publicKey];
+
+    cb(void 0, limit && typeof(limit.limit) === "number"?
+        limit.limit : DEFAULT_LIMIT);
 };
 
 var safeMkdir = function (path, cb) {
@@ -714,10 +773,16 @@ RPC.create = function (config /*:typeof(ConfigType)*/, cb /*:(?Error, ?Function)
                 });
             case 'GET_FILE_SIZE':
                 return void getFileSize(ctx.store, msg[1], Respond);
-            case 'GET_LIMIT': // TODO implement this and cache it per-user
-                return void getLimit(function (e, limit) {
+            case 'UPDATE_LIMITS':
+                return void updateLimits(config, safeKey, function (e, limit) {
+                    if (e) { return void Respond(e); }
+                    Respond(void 0, limit);
+                });
+            case 'GET_LIMIT':
+                return void getLimit(safeKey, function (e, limit) {
+                    if (e) { return void Respond(e); }
                     limit = limit;
-                    Respond('NOT_IMPLEMENTED');
+                    Respond(void 0, limit);
                 });
             case 'GET_MULTIPLE_FILE_SIZE':
                 return void getMultipleFileSize(ctx.store, msg[1], function (e, dict) {
@@ -725,7 +790,6 @@ RPC.create = function (config /*:typeof(ConfigType)*/, cb /*:(?Error, ?Function)
                     Respond(void 0, dict);
                 });
 
-
             // restricted to privileged users...
             case 'UPLOAD':
                 if (!privileged) { return deny(); }
@@ -775,6 +839,14 @@ RPC.create = function (config /*:typeof(ConfigType)*/, cb /*:(?Error, ?Function)
         handleMessage(session.privilege);
     };
 
+    var updateLimitDaily = function () {
+        updateLimits(config, undefined, function (e) {
+            if (e) { console.error('Error updating the storage limits', e); }
+        });
+    };
+    updateLimitDaily();
+    setInterval(updateLimitDaily, 24*3600*1000);
+
     Store.create({
         filePath: pinPath,
     }, function (s) {
diff --git a/www/common/common-util.js b/www/common/common-util.js
index f5ba9a61c..bbd648f7c 100644
--- a/www/common/common-util.js
+++ b/www/common/common-util.js
@@ -21,7 +21,7 @@ define([], function () {
             .replace(/ +$/, "")
             .split(" ");
         var byteString = String.fromCharCode.apply(null, hexArray);
-        return window.btoa(byteString).replace(/\//g, '-').slice(0,-2);
+        return window.btoa(byteString).replace(/\//g, '-').replace(/=+$/, '');
     };
 
     Util.base64ToHex = function (b64String) {
@@ -90,11 +90,21 @@ define([], function () {
     };
 
     Util.fetch = function (src, cb) {
+        var done = false;
+        var CB = function (err, res) {
+            if (done) { return; }
+            done = true;
+            cb(err, res);
+        };
+
         var xhr = new XMLHttpRequest();
         xhr.open("GET", src, true);
         xhr.responseType = "arraybuffer";
         xhr.onload = function () {
-            return void cb(void 0, new Uint8Array(xhr.response));
+            return void CB(void 0, new Uint8Array(xhr.response));
+        };
+        xhr.onerror = function () {
+            CB('XHR_ERROR');
         };
         xhr.send(null);
     };
diff --git a/www/common/cryptpad-common.js b/www/common/cryptpad-common.js
index 457102032..ca8de5a08 100644
--- a/www/common/cryptpad-common.js
+++ b/www/common/cryptpad-common.js
@@ -746,8 +746,15 @@ define([
         });
     };
 
+    common.updatePinLimit = function (cb) {
+        if (!pinsReady()) { return void cb('[RPC_NOT_READY]'); }
+        rpc.getFileListSize(cb);
+    };
+
     common.getPinLimit = function (cb) {
-        cb(void 0, typeof(AppConfig.pinLimit) === 'number'? AppConfig.pinLimit: 1000);
+        if (!pinsReady()) { return void cb('[RPC_NOT_READY]'); }
+        rpc.getFileListSize(cb);
+        //cb(void 0, typeof(AppConfig.pinLimit) === 'number'? AppConfig.pinLimit: 1000);
     };
 
     common.isOverPinLimit = function (cb) {
diff --git a/www/common/media-tag.js b/www/common/media-tag.js
index d0953bcf6..0d18138ce 100644
--- a/www/common/media-tag.js
+++ b/www/common/media-tag.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?exports.MediaTag=t():e.MediaTag=t()}(this,function(){return function(e){function t(r){if(n[r])return n[r].exports;var o=n[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,t),o.l=!0,o.exports}var n={};return t.m=e,t.c=n,t.i=function(e){return e},t.d=function(e,n,r){t.o(e,n)||Object.defineProperty(e,n,{configurable:!1,enumerable:!0,get:r})},t.n=function(e){var n=e&&e.__esModule?function(){return e.default}:function(){return e};return t.d(n,"a",n),n},t.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},t.p="",t(t.s=82)}([function(e,t,n){"use strict";var r={IMAGE:"image",AUDIO:"audio",VIDEO:"video",PDF:"pdf",DASH:"dash",DOWNLOAD:"download",CRYPTO:"crypto",CLEAR_KEY:"clear-key",MEDIA_OBJECT:"media-object"};e.exports=r},function(e,t,n){"use strict";var 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e.hasAttribute("src")&&"video"===e.getType()&&null!==t.exec(e.getExtension())&&null!==n.exec(e.getMimeType())}}]),t}(s);e.exports=f},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),a=n(0),c=n(1),s=n(2),f=function(e){function t(){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,a.MEDIA_OBJECT,c.SANITIZER))}return i(t,e),u(t,[{key:"process",value:function(e){return e.hasAttribute("src")&&e.hasAttribute("data-type")}}]),t}(s);e.exports=f},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),a=n(3),c=n(0),s=function(e){function t(){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,c.AUDIO))}return i(t,e),u(t,[{key:"process",value:function(e){var t=document.createElement("audio");t.setAttribute("src",e.getAttribute("src")),e.utilsSetAllDataAttributes(t),e.replaceContents([t])}}]),t}(a);e.exports=s},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),a=n(3),c=n(0),s=function(e){function t(){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,c.DASH))}return i(t,e),u(t,[{key:"process",value:function(e){var t=document.createElement("video"),n=new shaka.Player(t),r=e.getAttribute("id"),o=e.getAttribute("key");if(r&&o){var i='{"'+r+'": "'+o+'"}',u=JSON.parse(i);n.configure({drm:{clearKeys:u}})}e.utilsSetAllDataAttributes(t),e.replaceContents([t]),n.load(e.getAttribute("src")).then(function(){})}}]),t}(a);e.exports=s},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),a=n(3),c=n(0),s=function(e){function t(){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,c.IMAGE))}return i(t,e),u(t,[{key:"process",value:function(e){var t=document.createElement("img");t.setAttribute("src",e.getAttribute("src")),e.utilsSetAllDataAttributes(t),e.replaceContents([t])}}]),t}(a);e.exports=s},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),a=n(3),c=n(0),s=function(e){function t(){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,c.PDF))}return i(t,e),u(t,[{key:"process",value:function(e){var t=e.getAttribute("src"),n=document.createElement("canvas");e.utilsSetAllDataAttributes(n),e.replaceContents([n]),PDFJS.disableWorker=!0,PDFJS.getDocument(t).promise.then(function(e){function t(e){var t=1,r=e.getViewport(t),o=n.getContext("2d");n.height=r.height,n.width=r.width;var i={canvasContext:o,viewport:r};e.render(i).then(function(){})}function r(t){t||console.log("no event"),0===t.buttons?o===e.numPages?o=1:o++:4===t.buttons&&(1===o?o=e.numPages:o--)}var o=1;e.getPage(o).then(function(e){t(e)}),n.onclick=function(n){r(n),e.getPage(o).then(function(e){t(e)})}},function(e){console.error(e)})}}]),t}(a);e.exports=s},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),a=n(3),c=n(0),s=function(e){function t(){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,c.VIDEO))}return i(t,e),u(t,[{key:"process",value:function(e){var t=document.createElement("video");t.setAttribute("src",e.getAttribute("src")),e.utilsSetAllDataAttributes(t),e.replaceContents([t])}}]),t}(a);e.exports=s},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=n(1),a=n(5),c=n(6),s=function(e){function t(e){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,e,u.SANITIZER,a.EVERY))}return i(t,e),t}(c);e.exports=s},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function o(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function i(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var u=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),a=n(40),c=n(0),s=n(4),f=function(e){function t(){return r(this,t),o(this,(t.__proto__||Object.getPrototypeOf(t)).call(this,c.MEDIA_OBJECT))}return i(t,e),u(t,[{key:"process",value:function(e){console.log("Some stuff to sanitize media object"),s.return(e)}}]),t}(a);e.exports=f},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}var o=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),i=function(){function e(){r(this,e)}return o(e,null,[{key:"hasFunction",value:function(t){return!!e.get(t)}},{key:"isStored",value:function(t){return!!e.get(t)}},{key:"store",value:function(t,n){e.isStored(t)&&console.warn('The key "'+t+'" is already registered, the content will be overwritten.'),e.map[t]=n}},{key:"unstore",value:function(t){e.isStored(t)?delete e.map[t]:console.warn('The key "'+t+'" not exists in this manager')}},{key:"get",value:function(t){return e.map[t]}},{key:"keys",value:function(){return Object.keys(e.map)}},{key:"values",value:function(){return e.keys().map(function(t){return e.get(t)})}},{key:"knows",value:function(t){var n=Object.keys(e.map),r=Object.keys(e.map).map(function(t){return e.map[t]});return n.some(function(e){var n={};return n[t]=null,e===Object.keys(n)[0]})||r.some(function(e){return e===t})}},{key:"like",value:function(t){return Object.keys(e.map).filter(function(n){var r={};return r[t]=null,n===Object.keys(r)[0]||e.map[n]===t}).map(function(t){var n={};return n[t]=e.map[t],n})}}]),e}();i.map={},e.exports=i},function(e,t,n){"use strict";function r(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}var o=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),i=function(){function e(){r(this,e)}return o(e,null,[{key:"isStored",value:function(t){return!!e.get(t)}},{key:"store",value:function(t,n){e.isStored(t)&&console.warn('The key "'+t+'" is already registered, the content will be overwritten.'),e.map[t]=n}},{key:"unstore",value:function(t){e.isStored(t)?delete e.map[t]:console.warn('The key "'+t+'" not exists in this manager')}},{key:"get",value:function(t){return e.map[t]}},{key:"keys",value:function(){return Object.keys(e.map)}},{key:"values",value:function(){return e.keys().map(function(t){return e.get(t)})}},{key:"knows",value:function(t){var n=Object.keys(e.map),r=Object.keys(e.map).map(function(t){return e.map[t]});return n.some(function(e){var n={};return n[t]=null,e===Object.keys(n)[0]})||r.some(function(e){return e===t})}},{key:"like",value:function(t){return Object.keys(e.map).filter(function(n){var r={};return r[t]=null,n===Object.keys(r)[0]||e.map[n]===t}).map(function(t){var n={};return n[t]=e.map[t],n})}}]),e}();i.map={},e.exports=i},,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,function(e,t,n){e.exports=n(14)}])});
\ No newline at end of file
diff --git a/www/common/pinpad.js b/www/common/pinpad.js
index 3470db34e..efa915ec7 100644
--- a/www/common/pinpad.js
+++ b/www/common/pinpad.js
@@ -121,6 +121,29 @@ define([
                 });
             };
 
+            // Update the limit value for all the users and return the limit for your publicKey
+            exp.updatePinLimits = function (cb) {
+                rpc.send('UPDATE_LIMITS', undefined, function (e, response) {
+                    if (e) { return void cb(e); }
+                    if (response && typeof response === "number") {
+                        cb (void 0, response);
+                    } else {
+                        cb('INVALID_RESPONSE');
+                    }
+                });
+            };
+            // Get the storage limit associated with your publicKey
+            exp.getLimit = function (cb) {
+                rpc.send('GET_LIMIT', undefined, function (e, response) {
+                    if (e) { return void cb(e); }
+                    if (response && typeof response === "number") {
+                        cb (void 0, response);
+                    } else {
+                        cb('INVALID_RESPONSE');
+                    }
+                });
+            };
+
             cb(e, exp);
         });
     };
diff --git a/www/file/file-crypto.js b/www/file/file-crypto.js
index 5290dfb80..cde49759c 100644
--- a/www/file/file-crypto.js
+++ b/www/file/file-crypto.js
@@ -7,6 +7,12 @@ define([
     var plainChunkLength = 128 * 1024;
     var cypherChunkLength = 131088;
 
+    var computeEncryptedSize = function (bytes, meta) {
+        var metasize = Nacl.util.decodeUTF8(JSON.stringify(meta)).length;
+        var chunks = Math.ceil(bytes / plainChunkLength);
+        return metasize + 18 + (chunks * 16) + bytes;
+    };
+
     var encodePrefix = function (p) {
         return [
             65280, // 255 << 8
@@ -131,23 +137,15 @@ define([
 
         var i = 0;
 
-        /*
-            0: metadata
-            1: u8
-            2: done
-        */
-
         var state = 0;
-
         var next = function (cb) {
+            if (state === 2) { return void cb(); }
+
             var start;
             var end;
             var part;
             var box;
 
-            // DONE
-            if (state === 2) { return void cb(); }
-
             if (state === 0) { // metadata...
                 part = new Uint8Array(plaintext);
                 box = Nacl.secretbox(part, nonce, key);
@@ -159,6 +157,7 @@ define([
                 var prefixed = new Uint8Array(encodePrefix(box.length)
                     .concat(slice(box)));
                 state++;
+
                 return void cb(void 0, prefixed);
             }
 
@@ -184,5 +183,6 @@ define([
         decrypt: decrypt,
         encrypt: encrypt,
         joinChunks: joinChunks,
+        computeEncryptedSize: computeEncryptedSize,
     };
 });
diff --git a/www/file/main.js b/www/file/main.js
index 32bcaafe6..e6ab7990c 100644
--- a/www/file/main.js
+++ b/www/file/main.js
@@ -36,6 +36,7 @@ define([
         var key = Nacl.randomBytes(32);
         var next = FileCrypto.encrypt(u8, metadata, key);
 
+        var estimate = FileCrypto.computeEncryptedSize(blob.byteLength, metadata);
         var chunks = [];
 
         var sendChunk = function (box, cb) {
@@ -47,15 +48,21 @@ define([
             });
         };
 
+        var actual = 0;
         var again = function (err, box) {
             if (err) { throw new Error(err); }
             if (box) {
+                actual += box.length;
                 return void sendChunk(box, function (e) {
                     if (e) { return console.error(e); }
                     next(again);
                 });
             }
 
+            if (actual !== estimate) {
+                console.error('Estimated size does not match actual size');
+            }
+
             // if not box then done
             Cryptpad.rpc.send('UPLOAD_COMPLETE', '', function (e, res) {
                 if (e) { return void console.error(e); }
@@ -168,11 +175,15 @@ define([
         if (!uploadMode) {
             var src = Cryptpad.getBlobPathFromHex(hexFileName);
             return Cryptpad.fetch(src, function (e, u8) {
+                if (e) { return void Cryptpad.alert(e); }
                 // now decrypt the u8
-                if (e) { return window.alert('error'); }
                 var cryptKey = secret.keys && secret.keys.fileKeyStr;
                 var key = Nacl.util.decodeBase64(cryptKey);
 
+                if (!u8 || !u8.length) {
+                    return void Cryptpad.errorLoadingScreen(e);
+                }
+
                 FileCrypto.decrypt(u8, key, function (e, data) {
                     if (e) {
                         Cryptpad.removeLoadingScreen();
diff --git a/www/media/inner.html b/www/media/inner.html
index bc5b96ae0..46e5cea4a 100644
--- a/www/media/inner.html
+++ b/www/media/inner.html
@@ -16,6 +16,8 @@
     }
     media-tag * {
         max-width: 100%;
+        margin: auto;
+        display: block;
     }
     </style>
 </head>
diff --git a/www/media/main.js b/www/media/main.js
index 9e8127a62..9e5276019 100644
--- a/www/media/main.js
+++ b/www/media/main.js
@@ -20,6 +20,11 @@ define([
     Cryptpad.addLoadingScreen();
 
     var andThen = function () {
+        $(window.document).on('decryption', function (e) {
+            var decrypted = e.originalEvent;
+            console.log(decrypted.blob, decrypted.metadata);
+        });
+
         var $bar = $iframe.find('.toolbar-container');
         var secret = Cryptpad.getSecrets();