diff --git a/client/src/modules/thememanager.js b/client/src/modules/thememanager.js
index e1b56ec8..18490350 100644
--- a/client/src/modules/thememanager.js
+++ b/client/src/modules/thememanager.js
@@ -10,6 +10,7 @@
 
 import ContentManager from './contentmanager';
 import Theme from './theme';
+import { FileUtils } from 'common';
 
 export default class ThemeManager extends ContentManager {
 
@@ -122,6 +123,19 @@ export default class ThemeManager extends ContentManager {
             return [name, maps.length ? maps.join(', ') + ',' : '()'];
         }
 
+        if (type === 'file' && Array.isArray(value)) {
+            if (!value || !value.length) return [name, '(),'];
+
+            const files = [];
+            for (let filepath of value) {
+                const buffer = await FileUtils.readFileBuffer(filepath);
+                const type = await FileUtils.getFileType(buffer);
+                files.push(`(data: ${this.toSCSSString(buffer.toString('base64'))}, type: ${this.toSCSSString(type.mime)}, url: ${this.toSCSSString(await FileUtils.toDataURI(buffer, type.mime))})`);
+            }
+
+            return [name, files.length ? files.join(', ') : '()'];
+        }
+
         if (type === 'slider') {
             return [name, value * setting.multi || 1];
         }
@@ -135,8 +149,13 @@ export default class ThemeManager extends ContentManager {
         }
 
         if (typeof value === 'string') {
-            return [name, `'${setting.value.replace(/\\/g, '\\\\').replace(/'/g, '\\\'')}'`];
+            return [name, this.toSCSSString(value)];
         }
     }
 
+    static toSCSSString(value) {
+        if (typeof value !== 'string' && value.toString) value = value.toString();
+        return `'${typeof value === 'string' ? value.replace(/\\/g, '\\\\').replace(/'/g, '\\\'') : ''}'`;
+    }
+
 }
diff --git a/client/webpack.config.js b/client/webpack.config.js
index f1941ce1..1760acb3 100644
--- a/client/webpack.config.js
+++ b/client/webpack.config.js
@@ -59,4 +59,4 @@ module.exports = {
             path.resolve(__dirname, '..', 'node_modules')
         ]
     }*/
-};
\ No newline at end of file
+};
diff --git a/common/modules/utils.js b/common/modules/utils.js
index 4f9b4a5a..93caee78 100644
--- a/common/modules/utils.js
+++ b/common/modules/utils.js
@@ -14,6 +14,7 @@ const
     _ = require('lodash');
 
 import { Vendor } from 'modules';
+import filetype from 'file-type';
 
 export class Utils {
     static overload(fn, cb) {
@@ -150,6 +151,15 @@ export class FileUtils {
         });
     }
 
+    static async readFileBuffer(path, options) {
+        return new Promise((resolve, reject) => {
+            fs.readFile(path, options || {}, (err, data) => {
+                if (err) return reject(err);
+                resolve(data);
+            });
+        });
+    }
+
     static async writeFile(path, data) {
         return new Promise((resolve, reject) => {
             fs.writeFile(path, data, err => {
@@ -196,4 +206,16 @@ export class FileUtils {
     static async readDir(path) {
         return this.listDirectory(path);
     }
+
+    static async getFileType(buffer) {
+        if (typeof buffer === 'string') buffer = await this.readFileBuffer(buffer);
+
+        return filetype(buffer);
+    }
+
+    static async toDataURI(buffer, type) {
+        if (typeof buffer === 'string') buffer = await this.readFileBuffer(buffer);
+        if (!type) type = this.getFileType(buffer).mime;
+        return `data:${type};base64,${buffer.toString('base64')}`;
+    }
 }
diff --git a/package.json b/package.json
index e2a2cf8d..488bbb32 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "electron-rebuild": "^1.7.3",
     "eslint": "^4.16.0",
     "eslint-plugin-vue": "^4.2.0",
+    "file-type": "^7.6.0",
     "gulp": "^3.9.1",
     "gulp-babel": "^7.0.0",
     "gulp-plumber": "^1.2.0",
@@ -49,7 +50,7 @@
     "build": "npm run build --prefix client && npm run build --prefix core && npm run build --prefix csseditor",
     "build_client": "npm run build --prefix client",
     "watch_client": "npm run watch --prefix client",
-    "build_core": "npm run build --prefix core", 
+    "build_core": "npm run build --prefix core",
     "watch_core": "npm run watch --prefix core",
     "watch_csseditor": "npm run watch --prefix csseditor",
     "lint": "eslint -f unix client/src core/src csseditor/src",
diff --git a/tests/themes/Example/config.json b/tests/themes/Example/config.json
index d2a59990..74a27f90 100644
--- a/tests/themes/Example/config.json
+++ b/tests/themes/Example/config.json
@@ -132,8 +132,7 @@
                 },
                 {
                     "id": "avatar",
-                    "type": "text",
-                    "value": "https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Cow_female_black_white.jpg/220px-Cow_female_black_white.jpg",
+                    "type": "file",
                     "text": "Avatar replace",
                     "hint": "Replace all avatars"
                 },
diff --git a/tests/themes/Example/index.scss b/tests/themes/Example/index.scss
index f6c8b000..f2940326 100644
--- a/tests/themes/Example/index.scss
+++ b/tests/themes/Example/index.scss
@@ -1,4 +1,4 @@
-@import 'vars.scss';
+@import 'vars';
 
 div {
     background: unquote($divBg);
@@ -11,7 +11,7 @@ span {
 }
 
 .avatar-large {
-    background-image: url($avatar) !important;
+    background-image: url(map-get($avatar, url)) !important;
     border-radius: $avatarRadius !important;
 }
 
diff --git a/tests/themes/Example/vars.scss b/tests/themes/Example/vars.scss
index 76723b91..09033270 100644
--- a/tests/themes/Example/vars.scss
+++ b/tests/themes/Example/vars.scss
@@ -1,6 +1,6 @@
 $divBg: green !default;
 $spanOpacity: 0.5 !default;
-$avatar: "https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Cow_female_black_white.jpg/220px-Cow_female_black_white.jpg" !default; 
+$avatar: (url: "https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Cow_female_black_white.jpg/220px-Cow_female_black_white.jpg") !default;
 $avatarRadius: 8px !default;
 $radioTest: red !default;
-$spanOpacity2: 1 !default;
\ No newline at end of file
+$spanOpacity2: 1 !default;