diff --git a/app/Factories/LinkFactory.php b/app/Factories/LinkFactory.php
index 14e5463..7ff2bda 100644
--- a/app/Factories/LinkFactory.php
+++ b/app/Factories/LinkFactory.php
@@ -66,13 +66,13 @@ class LinkFactory {
             // has custom ending
             $ending_conforms = LinkHelper::validateEnding($custom_ending);
             if (!$ending_conforms) {
-                throw new \Exception('Sorry, but custom endings
+                throw new \Exception('Custom endings
                     can only contain alphanumeric characters, hyphens, and underscores.');
             }
 
             $ending_in_use = LinkHelper::linkExists($custom_ending);
             if ($ending_in_use) {
-                throw new \Exception('Sorry, but this URL ending is already in use.');
+                throw new \Exception('This URL ending is already in use.');
             }
 
             $link_ending = $custom_ending;
@@ -97,7 +97,6 @@ class LinkFactory {
         $link->is_api    = $is_api;
 
         if ($creator) {
-            // if user is logged in, save user as creator
             $link->creator = $creator;
         }
 
diff --git a/app/Http/Controllers/Api/ApiLinkController.php b/app/Http/Controllers/Api/ApiLinkController.php
index e05c25e..b1f377c 100644
--- a/app/Http/Controllers/Api/ApiLinkController.php
+++ b/app/Http/Controllers/Api/ApiLinkController.php
@@ -7,12 +7,22 @@ use App\Helpers\LinkHelper;
 use App\Exceptions\Api\ApiException;
 
 class ApiLinkController extends ApiController {
+    protected function getShortenedLink($long_url, $is_secret, $custom_ending, $link_ip, $username, $response_type) {
+        try {
+            $formatted_link = LinkFactory::createLink(
+                $long_url, $is_secret, $custom_ending, $link_ip, $username, false, true);
+        }
+        catch (\Exception $e) {
+            throw new ApiException('CREATION_ERROR', $e->getMessage(), 400, $response_type);
+        }
+
+        return $formatted_link;
+    }
+
     public function shortenLink(Request $request) {
         $response_type = $request->input('response_type');
         $user = $request->user;
 
-        // Validate parameters
-        // Encode spaces as %20 to avoid validator conflicts
         $validator = \Validator::make(array_merge([
             'url' => str_replace(' ', '%20', $request->input('url'))
         ], $request->except('url')), [
@@ -23,22 +33,71 @@ class ApiLinkController extends ApiController {
             throw new ApiException('MISSING_PARAMETERS', 'Invalid or missing parameters.', 400, $response_type);
         }
 
-        $long_url = $request->input('url'); // * required
-        $is_secret = ($request->input('is_secret') == 'true' ? true : false);
-
-        $link_ip = $request->ip();
-        $custom_ending = $request->input('custom_ending');
-
-        try {
-            $formatted_link = LinkFactory::createLink($long_url, $is_secret, $custom_ending, $link_ip, $user->username, false, true);
-        }
-        catch (\Exception $e) {
-            throw new ApiException('CREATION_ERROR', $e->getMessage(), 400, $response_type);
-        }
+        $formatted_link = $this->getShortenedLink(
+            $request->input('url'),
+            ($request->input('is_secret') == 'true' ? true : false),
+            $request->input('custom_ending'),
+            $request->ip(),
+            $user->username,
+            $response_type
+        );
 
         return self::encodeResponse($formatted_link, 'shorten', $response_type);
     }
 
+    public function shortenLinksBulk(Request $request) {
+        $response_type = $request->input('response_type', 'json');
+        $request_data = $request->input('data');
+
+        $user = $request->user;
+        $link_ip = $request->ip();
+        $username = $user->username;
+
+        if ($response_type != 'json') {
+            throw new ApiException('JSON_ONLY', 'Only JSON-encoded responses are available for this endpoint.', 401, $response_type);
+        }
+
+        $links_array_raw_json = json_decode($request_data, true);
+
+        if ($links_array_raw_json === null) {
+            throw new ApiException('INVALID_PARAMETERS', 'Invalid JSON.', 400, $response_type);
+        }
+
+        $links_array = $links_array_raw_json['links'];
+
+        foreach ($links_array as $link) {
+            $validator = \Validator::make($link, [
+                'url' => 'required|url'
+            ]);
+
+            if ($validator->fails()) {
+                throw new ApiException('MISSING_PARAMETERS', 'Invalid or missing parameters.', 400, $response_type);
+            }
+        }
+
+        $formatted_links = [];
+
+        foreach ($links_array as $link) {
+            $formatted_link = $this->getShortenedLink(
+                $link['url'],
+                (array_get($link, 'is_secret') == 'true' ? true : false),
+                array_get($link, 'custom_ending'),
+                $link_ip,
+                $username,
+                $response_type
+            );
+
+            $formatted_links[] = [
+                'long_url' => $link['url'],
+                'short_url' => $formatted_link
+            ];
+        }
+
+        return self::encodeResponse([
+            'shortened_links' => $formatted_links
+        ], 'shorten_bulk', 'json');
+    }
+
     public function lookupLink(Request $request) {
         $user = $request->user;
         $response_type = $request->input('response_type');
diff --git a/app/Http/routes.php b/app/Http/routes.php
index 7982af5..e936cb1 100644
--- a/app/Http/routes.php
+++ b/app/Http/routes.php
@@ -66,6 +66,7 @@ $app->group(['prefix' => '/api/v2', 'namespace' => 'App\Http\Controllers\Api', '
     /* API shorten endpoints */
     $app->post('action/shorten', ['as' => 'api_shorten_url', 'uses' => 'ApiLinkController@shortenLink']);
     $app->get('action/shorten', ['as' => 'api_shorten_url', 'uses' => 'ApiLinkController@shortenLink']);
+    $app->post('action/shorten_bulk', ['as' => 'api_shorten_url_bulk', 'uses' => 'ApiLinkController@shortenLinksBulk']);
 
     /* API lookup endpoints */
     $app->post('action/lookup', ['as' => 'api_lookup_url', 'uses' => 'ApiLinkController@lookupLink']);
diff --git a/docs/developer-guide/api.md b/docs/developer-guide/api.md
index b0edd90..bcd1927 100644
--- a/docs/developer-guide/api.md
+++ b/docs/developer-guide/api.md
@@ -2,8 +2,8 @@
 -----------------------------
 
 ## API keys
-To authenticate a user to Polr, you will need to provide an API key along with
-each request to the Polr API, as a GET or POST parameter. (e.g `?key=API_KEY_HERE`)
+To authenticate a user to Polr, you *must* provide an API key along with
+each request to Polr API endpoints, as a GET or POST parameter. (e.g `?key=API_KEY_HERE`)
 
 ## Assigning an API key
 To assign an API key, log on from an administrator account, head over to the "Admin"
@@ -26,11 +26,9 @@ See [API endpoints](#api-endpoints) for more information on the actions.
 
 ## Response Type
 The Polr API will reply in `plain_text` or `json`. The response type can be
-set by providing the `response_type` argument to the request. If not provided,
-the response type will default to `plain_text`.
-
-Data endpoints will only return JSON-formatted data and will default to `json` if no
-`response_type` is provided.
+set by providing the `response_type` argument to the request. If this argument is not provided,
+the response type will default to either `plain_text` or `json` depending
+on the endpoint.
 
 Example `json` responses:
 ```
@@ -84,7 +82,61 @@ Response:
 }
 ```
 
-Remember that the `url` argument must be URL encoded.
+The `url` argument must be URL encoded.
+
+### /api/v2/action/shorten_bulk
+
+_`POST` only_
+
+Arguments:
+
+ - `data`: a string containing a JSON-encoded object with an array of links
+
+Example `data` argument:
+```json
+{
+  "links": [
+      {
+          "url": "https://polrproject.org/"
+      },
+      {
+          "url": "https://youtube.com",
+          "is_secret": true
+      },
+      {
+          "url": "https://github.com/cydrobolt/polr",
+          "custom_ending": "polrgithub"
+      }
+  ]
+}
+```
+
+Response: A JSON-encoded object with a list of shortened links.
+
+Example response:
+```
+{
+    "action": "shorten_bulk",
+    "result": {
+        "shortened_links": [
+            {
+                "long_url": "https://polrproject.org/",
+                "short_url": "http://demo.polr.me/81"
+            },
+            {
+                "long_url": "https://youtube.com",
+                "short_url": "http://demo.polr.me/84/b496"
+            },
+            {
+                "long_url": "https://github.com/cydrobolt/polr",
+                "short_url": "http://demo.polr.me/polrgithub"
+            }
+        ]
+    }
+}
+```
+
+
 
 ### /api/v2/action/lookup
 The `lookup` action takes a single argument: `url_ending`. This is the URL to
diff --git a/docs/developer-guide/api_errors.md b/docs/developer-guide/api_errors.md
index adbe5e8..7346b66 100644
--- a/docs/developer-guide/api_errors.md
+++ b/docs/developer-guide/api_errors.md
@@ -8,6 +8,8 @@ it to `true` in `.env`
 
 `MISSING_PARAMETERS`: Invalid or missing parameters.
 
+`INVALID_PARAMETERS`: Invalid parameters.
+
 `NOT_FOUND`: Object not found.
 
 `ACCESS_DENIED`: User is not authorized to access the object.
diff --git a/docs/user-guide/installation.md b/docs/user-guide/installation.md
index f97a930..96feef9 100644
--- a/docs/user-guide/installation.md
+++ b/docs/user-guide/installation.md
@@ -23,7 +23,7 @@ you may be interested in looking at a [legacy 1.x release](https://github.com/cy
     - JSON PHP Extension
     - PHP curl extension
 
-## Downloading the source code
+## Download the source code
 
 If you would like to download a stable version of Polr, you may check out [the releases page](https://github.com/cydrobolt/polr/releases).
 
@@ -49,7 +49,7 @@ $ chown -R apache polr
 $ chcon -R -t httpd_sys_rw_content_t polr/storage polr/.env
 ```
 
-## Installing using `composer`
+## Install `composer` dependencies
 
 ```bash
 # download composer package
@@ -177,7 +177,7 @@ server {
 To run Polr on another HTTP server or on shared hosting, you will need to set the home
 directory to `/PATH_TO_POLR/public`, not the root Polr folder.
 
-## Creating the database
+## Create the database
 
 ### MySQL